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



stout with coarse serrations on its inner, and fine teeth on its outer 

 border. 



Specimens from the Chilka Lake differ slightly from the above 

 description, which is taken from Port Canning specimens. They 

 are slightly smaller and on the 2nd segment of the 5th pair of legs 

 there is a corona of fine spines on the external part of the distal 

 margin. 



& . Total length = i*20 mm. 



Proportional length of cephalo-thorax and abdomen — 



63 : 37 = 100. 



The cephalo-thorax resembles that of the 2 . The abdomen 

 consists of five segments : the ist segment is short and unarmed : 

 the 2nd and 3rd segments are armed with a complete circle of 

 spines around the posterior margin and in addition bear a trans- 

 verse row of spines on the ventral surface : the 4th segment bears 

 only the distal ring of spines and segment 5 is unarmed. The 

 proportional lengths of the abdominal segments and furca are 

 as follows : — 



13 : 20 : 19 : 17 i 9 : 22 = 100. 



The furcal rami are symmetrical and bear five setae of Vv'hich 

 the 3rd resembles the others and is not expanded as in the 9 . 



The 1st antennae. — That of the left side is unmodified as in 

 the $ : the segments have the following proportions : — 



Segments ^ •' ^ : 3 : 4 : 5 : 6 : 7 : 8 : 9 : 10 : n : 12 : 13 : 14 : 15: 1 6: 



^ 65 : 54 : 19 : 32 : 38 : 22 : 24 : 77 : 27 : 43 : 54 : 59 : 65 : 65 : 65 : 59 : 

 17 : 18 : 19 : 20 : 21. 



48 : 48 : 51 : 59 : 76 = 1000. 



On the right side the antenna is modified to form a grasping 

 organ : the segrnents have the following proportional lengths : — 

 Segments ^ : 2 : 3 : 4 : 5 : 6 : 7 : 8-10 : 11 : 12 : 13 ; 14 : I5 : 16 : 1 7 : 

 75 : 53 : 22 : 19 : 19 : 19 : 1 1 : 68 : 19 : 26 : 30 : 64 : 64 : 68 : 56 : 

 18 : 19 : 20-21. 



113 : 105 : 169 = 1000. 



Segments 13 to 17 are considerably swollen ; segment ij 

 bears a tooth-plate that extends the whole length of its upper 

 margin and overlaps the succeeding segment; segment 18 is armed 

 with a tooth-plate that terminates distally in a sharp point ; 

 segment 19 bears two spine-like tooth-plates, of which the 

 proximal is about half the length of the distal, and this latter ex- 

 tends to the extremiC limit of the segment. 



All tooth-plates are stained a brown colour. 



The 2nd antennae, mouth-parts, and swimming legs are as 

 in the $ . 



The ^th pair of legs. — The right leg consists of four segments : 

 the 1st segment (basal) is produced internally in an angular 

 projection bearing at its internal angle a double process, the outer 

 part rounded and the inner truncated and provided with a seta. 

 Exopod I is produced at its distal external angle in a prominent 



