1912.| R. B. SeyMouR-SEWELL: Surface-Living Copepoda. 361 
Occurrence: Localities B and Q. 
Numerous examples of this species were obtained, both males 
‘and females, and they agree very closely with the description given 
by Cleve (loc. cit.) of his specimens from the Arabian Sea. As, 
however, they differ in a few details I append a full description 
below. 
on ength irom 1°2°to 1° 4 mii, 
The forehead, when viewed in profile, has a rounded outline, 
terminating anteriorly in a bifid, backwardly directed rostrum ; 
behind the forehead is a well-marked dorsal hump. A little anterior 
to the posterior border of the head region, in the middle line, is a 
large backwardly-curved spine, which terminates in a pair of small 
antrorse hooks. 
The head and ist thoracic segments are separate. The last 
thoracic segment is armed on each side with a sharp backwardly- 
directed spine. 
The abdomen is composed of three segments, of which the Ist 
is markedly swollen and bears on each side ventrally a row of 
sharp spines. The 2nd segment is longer than the anal and bears 
on its right side two short rows of spines, of which the proximal is 
the more ventrally situated. The furcal joints are three times as 
long as broad and the 5th seta is much shorter and stouter than 
the others, and arises at the junction of the middle and distal 
thirds. 
The 1st antennae are composed of 21 free joints, the first or 
basal joint being formed by the fusion of Ist to 4th segments, 
though in a few specimens traces of separation could be made out 
between the 3rd and 4th. ‘The proportional lengths are as 
follows :— 
1-4. 5. 6. 7. 8. 9. 10, II. 12. 13. 14. 15. WG. 7s Ubis HOS BOs Aig CEE Oe Bzl 
42, 7. 10. IO, 10. Ig. 14) 14. 17. 23. 25. 28. 30. 30. 31. 29. 21. I9. 14. 14. 14. 
The fused basal joint carries three spines, on its anterior 
border a small proximal and a large distal, and on its posterior 
border a small spine opposite the small proximal one on the 
anterior surface. 
The 1st leg closely resembles that of C. ¢yficus (Kroyer), in 
having serrated spines on the 1st and 2nd segments of the exopo- 
dite, but differs in the possession of a small spine on the inner 
border of the 2nd basal segment near the joint for the endopodite. 
The 5th pair of legs corresponds exactly with Cleve’s descrip- 
tion and figures. 
@ Length 12 mm. 
Abdomen 5-jointed, the last segment being very short. 
The anterior antennae are, as usual, asymmetrical; that of 
the left side is identical with the female type; the right grasping 
antenna has the first four segments separate, not fused as in the 
female and left male antenna, and the roth to 21st and 22nd 
