SURFACE COPEPODA OF THE GULF OF MAKNAR. 245 



The second antenna and mouth-parts .a^ie similar to other 



embers of the genus. 



The fifth pair of legs consist of a fairly long basal joint 

 bearing a minute seta on its external margm distaUy, and 

 having a long and delicate terminal spine. This spine is 

 curved, and has a markedly swollen base. 



,^. Total length, 0-75 mm. 

 The proportional lengths of cephalothorax and abdomen are, 



The abdomen consists of four segments having, with the 

 f ureal rami, the proportional lengths :— 18 : 14 : 3 : 9 : 10, 



The first antenna on the right side is, as usual, modified to 

 form a grasping organ ; it consists of fifteen separate joints 

 having the following proportions : — 



Segments: 1-4. 5-6. 7-8. 9. 10. n. 12. 13. 14. 



121 66 66 18 36 36 97 42 48 

 Segments: 15. I6, 17. is. 19-21. 22-25. 



96 115 109 42 66 42 



The fifth pair of legs are of the usual type ; the right leg 

 forms a claw, the second segment bears a somewJiat quadran- 

 gular process on its inner border, and the third segment 

 terminates in two short unequal spines. 



Genus Acartiel!a, no v. 



I propose to establish a new genus for the reception of 

 certain AcartiaAJikQ species which have been obtained from 

 Indian coastal waters. The first species I described under the 

 name Acartia tortaniformis (Sewell, 1912, p. 346, PI. XXI 

 figs. 1-10), from the Chittagong region and Rangoon river 

 estuary on the coast of Burma ; a second species was obtained 

 m a tow-netting taken o£f Kilakarai. 



These two species differ from those of the genus Acartia 

 in that in the female the fifth pair of legs possesses both an 

 exopodite and endopodite, and in tl;e male the right leg forms 

 a weU-developed clasping apparatus; in both species the 

 rostrum is absent ; the first antenna of the female consists of 



^^ * 6(10)13 ■ 



