1918.] R. B. S. SEWEI.L : New species of Copepoda. 5 



spine; exopod 2 is much dilated and bears a few spines on both 

 internal and external margins ; exopod 3 in shape closely resembles 

 the corresponding joint in P. lobipes ', about the middle of its 

 length it is dilated the dilatation being fringed distally with spines, 

 and it terminates in a long curved simple process. 



The left leg consists of only three joints: of these the 1st 

 (basal) bears a row of spines on its external margin and internally 

 is produced into two processes which represent the remains of the 

 endopod — the innermost is long and simple and the outer process 

 is a broad fiat plate terminating in two spines. Exopod x is 

 provided with a row of needle-like spines on the proximal part of 

 its inner margin, and externally it is produced at its distal end in 

 a short stout spinous process, while the distal border is armed 

 posteriorly with a row of spinules ; exopod 2-3 (the terminal 

 segment) bears a row of needle-like spines on the proximal part of 

 its inner margin and externally it carries a large doubly-serrated 

 spine ; the terminal part of the joint is bent sharply on itself and 

 terminates in three unequal processes. 



Pseudodiaptomus annandalei, sp. nov. 

 (Plate X, fig. 9.) 



Examples of both sexes were present in the Chilka Lake 

 collection. I have much pleasure in dedicating this species to 

 Dr. N. Annandale, the Director of the Zoological Survey of 

 India. 



$ . Total length = 118 mm. 



Proportional length of cephalo-thorax and abdomen — 



71 : 29 ^ 100. 



The head and first thoracic segments are fused, as also are 

 thoracic segments 4 and 5 : the forehead when viewed from 

 above forms a sharply rounded prominence : the rostrum consists 

 of two spinous processes. The posterior thoracic margin is rounded 

 and is armed with a comb of 6-8 coarse curved teeth, and the 

 last thoracic segment also bears laterally a double row of small 

 spines. 



The abdomen consists of four segments; of thoee the 1st 

 is very nearly symmetrical and is produced on either side in 

 a large recurved spine, but there are no spines on the posterior 

 margin ; segment 2 is armed with a row of very small spines on the 

 posterior margin dorsally; segment 3 is armed with a corona 

 of spines on the dorso-lateral part of the posterior border, which 

 spines are somewhat larger laterally than on the dorsal surface. 



The furcal rami are symmetrical and bear five setae which are 

 short and stout and the 3rd seta is much dilated: all the setae 

 and the inner margin of the furcal rami are fringed with bristle-like 

 hairs. The proportional lengths of the abdominal segments and 

 furca are as follows : — 



40 : 14 : 14 : 9 : 23 = too. 



