Series of maxillipeds from Paracyamus boopis Juveniles of various sizes.
(1) Juvenile, 1 mm long. (2) Juvenile, 1 ½ mm. long. (3) Juvenile, 2 mm. long. (4) Juvenile, 2 ⅔ mm. long. (5) Juvenile, 3 mm. long. (6) Juvenile, 3 ⅔ mm. long. (7) Juvenile, 4 ⅓ mm. long.

of inner lobes, small and somewhat globular, with similar distal setae. Juvenile: Total length 2 ⅔ mm. Palp present, four-segmented, attached to outer margin of outer lobe. First segment more than twice as large as outer lobe, second and third segments successively longer; dactylos subequal with third segment, stout, curved, tapering, with row of minute setules distally along inner margin.

Upper Lip. Dorsal margin with wide, shallow cleft dividing lip into two lobes, each finely bristled terminally and along inner margins.

Lower Lip. Inner and outer lobes present. Inner slightly cleft medially, raised on mound, both mound and lobe with strong bristles. Outer lobes much larger, subovate, inner and distal margins strongly setose.

Body. Male: General outline of body ovate in dorsal view. Head parallelsided. Segment 1 fused with and widening sharply from head, then rounding laterally and distally. Segment 2 subrectangular, nearly twice as long as head, and half as wide again, anterior and posterior margins excavated sinuously to projecting anterolateral and posterolateral corners. Lateral margins between projections also sinuous. Segments 3 and 4 more or less spindle-shaped, widening a little laterally, posterior angles bluntly produced. Segments 5 and 6, anterior and posterior margins parallel, broadly arched and broadly concave posteriorly; last segment subtriangular, slightly broader than long. Body segments 6 and 7 each with a single pair of sharp tubercles ventrally. Female: Ventral surface of segment 5 with pair of inwardly directed blunt processes; a single pair of pointed tubercles on each of segments 5, 6, and 7.

Mandibles. Molar process absent. Right mandible with cutting edge of upper process with six teeth, and lower two-toothed spine. Surface and margin immedi-

ately below lower spine finely setulose, below that again a single setulose spine. Left mandible with upper process of cutting edge bearing three teeth, lower spine with five. Below spine, inner margin finely bristled, inner margin medially with setulose spine.

Gnathopod 1. Male: Basos sharply constricted proximally, twice as long as distal width; ischium subequal in width with basos, half as long as wide. Merus subovate, narrower than ischium, length twice width, distal two-thirds of anterior margin contiguous with proximal margin of carpus. Carpus subtriangular, width ⅔ length, anterior margin twice length of posterior. Propod subtriangular, anterior margin rounded, more than twice length of straight posterior margin which rounds sharply to transverse palm Palm with strong tooth medially, excavated between tooth and dactylos, which is curved and as long as palm. Tooth and outer margin of palm minutely serrate. Female: Propod narrower at distal end than in male; palm oblique, poorly defined, minutely denticulatc, small setae at dactylos base and on single median tooth.

Gnathopod 2. Male: Merus subrectangular, as long as wide; anterior margin produced medially to strong blunt projection reaching to proximal margin. Carpus smaller, subrectangular, very narrow. Propod twice as long as wide, posterior margin (palm) half as long as anterior, with two teeth, the proximal one a small blunt projection; the anterior, near base of dactylos, produced, acute and strong; the palm between teeth excavate; dactylos curved and reaching as far as proximal tooth. Female: Distal tooth of palm poorly defined, with five or so setae; both teeth denticulate; palm between teeth very little excavated, almost straight, non-denticulate.

Peraeopods 1 and 2. Segments 3 and 4 which bear the gills have no peraeopods, and the peraeopods on segment 5 are regarded as Peraeopods 3.

Peraeopod 3. Ischium, anterior margin with strong flange produced backwardly; a small subrectangular or conical projection arising medially near distal margin and projecting slightly posterior to base of flange. Merus subrectangular, anterior margin similarly produced. Carpus width twice its length, posterodistal angle sharply produced, distal margin with posterior half excavated to acute anterodistal angle; proximal angle forming broadly rounded projection. Propod narrowing distally, anterior margin convex, twice length of straight posterior margin (palm). Dactylos long, stout, strongly curved.

Peraeopods 4 and 5. Slightly larger, otherwise similar.

Urosome. This bears ventrally, in the male, a pair of simple conical projections (Pl. 24, fig. 9) which Sars refers to as “external sexual appendages.” Posterior to these is a single appendage (fig. 10), cleft terminally for a third of its length to form two globular lobes. the outer lateral margins of lobes richly covered with bristles, the bristles thinning out along peduncle margin. Corresponding to the telson is a small subcircular plate, with a simple conical projection either side (fig. 11), these possibly corresponding to uropods.

Gills. Male: Unsegmented; single, present on segments 3 and 4, and as long as body less segment 1. Each with pair of accessory appendages. Female: A little shorter, comparatively, than in male. Juvenile: Shorter and stouter, more balloonlike.

These specimens were taken by Mr. W. H. Dawbin at Te Awhaiti, in July, 1949, and are in my personal collection, slides 71 to 75. The female described above contained between 70 and 80 juveniles in her brood-pouch, ranging in