SURFACE OOPEPODA OF THE GULF OF MANNAR. 2l9 



in a sharp spinous projection ; exopod 2 bears five setae and 

 terminates in a small apical spinous process, while on its 

 posterior aspect it carries a series of sharp needle-like spines. 



The Third Pair of Legs. — Basal 1 bears a single internal 

 seta, and is finely serrated on its external margin ; basal 2 has 

 a spine-like projection on both inner and outer ends of the 

 distal margin. Both exopodite and endopodite consist of 

 three segments : exopod 1 has a single external spine and one 

 internal seta ; exopod 2 is similarly provided ; exopod 3 bears 

 three external spines ; all the marginal spines are of equal 

 size. In addition, certain of these segments are armed with 

 rows of spinules ; the second basal segment carries a series of 

 small spines on the triangular projection of its distal margin, 

 behind the base of exopod 1 ; exopod 2 bears a transverse row 

 of spines parallel to its posterior distal margin, and exopod 3 

 bears two rows of spines, one distally alon-^ the transverse 

 border and one shaped like 1 about the middle of its length, 

 both on the posterior aspect, 



Endopod 1 bears a single internal seta, and terminates 

 externally in a sharp spine-like process ; exopod 2 is similarly 

 provided, and in addition is armed with long needle-like spines 

 on its posterior aspect. Endopod 3 bears five setse, and is 

 armed with spines like the preceding segment. 



The fourth 'pair of legs are similar to the third pair, but are 

 armed with a transverse row of spines of the first basal 

 segment, and the marginal serration on this segment is 

 absent. 



The fifth pair of legs have the form characteristic of the 

 genus. The single segment bears three spines ; the outer is 

 extremely small and arises from the external margin ; the 

 second arises distally and is somewhat longer ; the third spine 

 is large and projects inwards from the inner margin ; it is 

 finely serrated on its internal border. 



<?. The total length, 7*0 mm. 



The proportional lengths of cephalothorax and abdomen 

 are 3:1. The abdomen consists of four segments having, with 

 the furcal rami, the following proportions : 15 : 25 : 20 : 22 : 10. 



