10 Records of the Indian Museum. [Vol. XVI, 



The cephalo-thorax resembles that of the $ . 

 The abdomen consists of 5 segments, having with the furca 

 the following proportional lengths : — 



ID : 31 : 20 : 6 : 14 : 19 = 100. 



The abdominal segments are all devoid of spines and the 2nd 

 furcal seta is not appreciably longer than the others. 



The 1st antennae. — This appendage when folded back does not 

 quite reach as far as the posterior thoracic margin. The distal 

 segments have the following proportional lengths : — 



Segments 13 : H : 15 : 16 : 17 : iS : 19-^1 : 22-25. 

 37 =43 ■• 31 : 37 : 82 : 8s : 85 : 159. 



Segment 17 bears a spine-like tooth-plate which projects 

 beyond the distal border over the following segment ; segment 18 

 bears a palisade of fine needle-like spines on its anterior border ; 

 segment 19 bears two spine-like tooth-plates and carries a single 

 long seta at its distal end. 



The 2nd antenna resembles that of A. centrura. 



The maxilliped resembles that of A. southwelli. 



The $th pair of legs. — The right leg forms the usual claw ; 

 basal 1 bears a stout seta ; exopod 2 is produced internally 

 in a roughly quadrilateral plate, and exopod 3 is curved and 

 is armed with a spine on its inner margin and a terminal spine. 

 The left leg : exopod i is produced internally in a rounded projec- 

 tion from the base of which arises a seta ; exopod 3 is curved and 

 rounded at the top and bears a long seta on its inner margin. 



Similar examples of the cf were obtained in both collections : it 

 is interesting to note that the specimens from Cochin are somewhat 

 larger than those from the Chilka Lake measuring 0-82 mm. 

 in total length and furthermore the abdominal segments are armed, 

 segments 2, 3 and 4 all bearing a row of minute spines on the 

 posterior margin dorsally. As, however, the specimens agree in all 

 other particulars, I am inclined to regard this as a local variation; 

 a very similar state of affairs exists in specimens of A. southwelli 

 obtained from the Gulf of Mannar and the Chilka Lake. 



Genus Acartiella, Sewell. 



Acartiella graveiyi, sp. nov. 



(Plate IX, fig. 7 ; Plate X, figs, i, 4 and 5.) 



Several examples, of both sexes, were present in the collection 

 from Cochin. 



5 . Total length = 1*4 mm. 



Proportional length of cephalo-thorax and abdomen — 

 62-8 : 37*2 = 100. 



The head and ist thoracic segment are separate, as also 

 are thoracic segments 4 and 5. 



