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-