i6 Records of the Indian Museum. [Vol. XVI, 



The various joints of the antenna have the followinjy propor- 

 tional lengths : — 



Segments i : 2-4 : 5 : 6 : 7 : 8 : 9-10 : 11 : 12-14 : 15-16 : 17 : 18 : 19 : 2cr : 

 46 : loi : 38 : 19 : 39 : 43 : 58 : ^7 : 89 : 78 : 56 : 58 : 68 : 52 : 

 2ri : 22 : 23 : 24 : 25. 



54 : 43 : 58 : 43 : 20 = 1000. 



Segments 2 to 4, 9 and 10, 12 to 14 and 15 and 16 are 

 respectively fused together. There are no spines on any of the 

 segments. 



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

 A . gravelyi. 



The $th pair of legs have the form typical of the genus. 

 The exopod is unserrated and is 3 to 4 times the length of the 

 endopod which is short and pointed and is unarmed. 



cf . Total length 1-07 mm. 



Proportional length of cephalo- thorax and abdomen — 



65 : 35 = 100. 



The head and thorax are similar to those of the 9 . 

 The abdomen consists of five segments, having with the furca 

 the following proportional lengths : — 



10 : 20 : 16 : 10 : 6 : 38 = 100. 



The furcal rami are nearly, though not quite, symmetrical, 

 the right ramus being slightly the longer. 



The 1st antennae. — That of the right side is modified to form 

 a grasping organ. The proximal segments are so irregularly fused 

 that it is almost impossible to determine their limits of demarca- 

 tion. Segments 13 to 17 are somewhat swollen, and the knee-joint 

 lies between segments 18 and 19. The '' endabschnitt " consists 

 of two joints. 



The proportional lengths of the distal segments are as fol- 

 lows : — 



Segments 13 : 14 : i5 : 1 6 : 17 : 18 : 19-21 : 22-25. 

 47 : 47 : 47 : 47 : 66 : 109 : 105 : i34- 



Segment 17 bears a tooth-plate that projects as a spine over 

 the proximal end of segment 18 ; segment 18 bears a tooth- 

 plate and two fang-like spines distally ; segment 19-21 bears 

 two spine-like tooth-plates of which the distal is much the longer 

 and projects beyond the end of the joint; distally, segment 21 

 bears a single long seta. All the tooth-plates are armed with fine 

 needle-like teeth. 



The left antenna when folded back reaches to the hind end of 

 the 3rd abdominal segment ; it is unmodified as in the 9 . The 

 proportional lengths of the distal segments are as follows : — 

 Segments 1 1 '■ ^^ : 13 -. 14 : 15 : 16 : 17 : 1 8 : 19 : 20 ; 2 1 : 22 : 23 : 24 : 25. 

 13 : 33 : 38 : 38 : 38 : 44 : 61 : 55 : 65 : 53 : 57 : 41 : 61 : 41 : 19- 



The month-parts and si&imming-legs are as in the 9 . 

 The ^th pair of legs. — The basal segment is produced on the 

 right side in a single stout conical process which overlaps the 



