distally, width about ⅓ length. Flagellum of 6 segments, as long as last 2 peduncle segments; tuft of long setae on minute end segment; segments longer than wide, a few long setae distally, last 3 or 4 with single long flaccid sensory seta each as well. Second: Peduncle 2nd segment has single spine inferodistally; length of 3rd ¾ width, 2 strong spines and several long setae on inferodistal angle; 4th segment as wide, margins slightly convex, length a little more than twice 3rd; a few long setae superiorly and on surface; 3 pairs of stout spines along inferior surface, 1 at inferodistal angle; numerous long setae on inferior surface; 5th segment nearly as long as 4th, long setae on superior margin, distal margin not produced along flagellum; 2 single long stout spines on inferior surface, numerous long setae on margin. Flagellum ⅔ length peduncle 5th segment; 1st segment has several long setae on margins, especially inferior, width ½ length, length ⅖ peduncle last segment; 2nd ½ length 1st, narrower, long setae distally; 3rd segment very small, setose, 2 apical spines.

Gnathopods. First: Convex palm not clearly defined, with 4 or 5 seta-tipped spines, the strongest outermost; stout dactylos longer than propod is wide, noticeable oblique tooth on inner margin; palm and inner margin of dactylos finely bristled. Second: Stout dactylos tridentate.

Peraeopods. Like C. sextonae except for minor details of proportion.

Urosome. Segments fused, uropods 1 and 2 inserted in notches in the lateral margins. Spines on uropods seem to be all seta-tipped.

Uropods. First: Reaching past rest, 2nd not reaching appreciably past 3rd. Rami of 1st subequal, ½ peduncle length; about 7 single stout spines along outer peduncle margin; distal angle slightly and bluntly produced downwards, distal margin produced on subtriangular lobe about ¼ way between rami; single strong spine on inner distal angle; 5 stout spines along outer margin of outer ramus, 4 at end, inner ramus with 4 along outer margin, distal angle acute, 3 spines on rounding distal margin, straight inner margin naked. Second: Inner ramus as long as peduncle, outer shorter; peduncle inner distal angle with single stout spine, width more than ½ length; outer distal angle of rami an acute tooth, outer ramus margins slightly convex, 2 stout spines along outer margin, 2 on oblique distal margin; inner ramus, spine ½ along outer margin, 1 stout end spine inside acute angle. Third: Peduncle wider than long, about 3 setae and a few bristles on convex outer margin. Ramus ovate, about 10 slender spinules on distal margin; surface and margin finely bristled. Telson: Subtriangular, but apex cut off and slightly concave; wider than long; 2 rows each of 3 teeth posteriorly on surface and parallel to length of animal.

Locality. Lyttelton Harbour, New Zealand (Chilton Collection).

Distribution. Lyttelton Harbour, N.Z.; Southern England; coasts of France and Holland; Mediterranean; northern coast of Africa from the Suez Canal to Senegal; Durban Bay; Dar-Es-Salaam; Baffin's Bay to Brazil on the east coast of America; Alaska, Vancouver and California on west coast; Oahu, Hawaiian Islands; ship's bottom at Hong Kong.

Remarks. I have already discussed the relationship of Chilton's C. contractum with C. acherusicum. In the absence of further information as to where and how this specimen was collected, I can only draw attention to Crawford's finding of this species at Plymouth “least common on Millbay Pontoon where it was out-numbered by C. acutum, C. sextoni and C. insidiosum.” The finding of all three