SURFACE COPEPODA OF THE GtTLF OF MANNAR. 247 



The -fifth fair of legs consists of a short, stout, basal portion 

 carrying a single plumose seta, and both exopodite and 

 endopodite are present ; the exopodite consists of a long 

 slightly curved process, terminating in a sharp point and 

 bearmg a single seta-like spine on its external margin 

 at about the junction of the middle and distal thirds ; the 

 endopodite is short and conical. There are no teeth on 

 either ramus, as is the case in A. tortaniformis. 



^. Total length, • 9 mm. 



Proportional lengths of cephalothorax and abdomen, 2:1. 



The abdomen consists of five segments having, with the 

 furcal rami, the following proportional lengths : — 12 : 22 : 17 : 

 11: 11: 35. 



The first antenna on the right side is modified to form a 

 grasping organ. It consists of eighteen separate joints, having 

 the following proportional lengths : — 



The second to fourth segments inclusive are fused together 

 to form a single joint ; the " endabschnitt " consists of two 

 joints, segments 19-21 and 22-25, respectiveh'-, being fused. 

 The seventeenth segment bears a row of needle-like teeth on 

 its anterior margin ; the eighteenth segment bears a row of 

 needle-like teeth anteriorly, and distally is armed with two 

 claw-like spines, of which the proximal is the larger ; the 

 nineteenth segment carries a tooth-plate armed with acicular 

 teeth, and the plate is produced beyond the distal extremity 

 of the joint in a sharp spinous process. 



The mouth-farts and swimming legs are the same as in the 

 female. 



The Fifth Pair of Legs. — Each consists of three segments, 

 and that on the right side forms a well-developed grasping 

 apparatus, as figured. 



