8 Records of the Indian Museum. [Voi<. XVI, 



rounded curve. The posterior thoracic margin is rounded and is 

 armed towards the dorsal surface with a single spine. 



The abdomen consists of five segments, which have with the 

 furca the following proportional lengths : — 



II : 20 : i8 : i8 : 9 : 24 == 100. 



Segments 2. 3 and 4 are each provided with a ring of spines on 

 the posterior margin. 



The furcal rami are s^'mmetrical : the 3rd seta is not enlarged 

 in this sex — a condition that is also found in P. annandalei and 

 P. tollingeri. 



The 1st antennae when folded back reach to the posterior 

 thoracic margin. The left antenna is unmodified and resembles 

 that of the 2 . I give below the proportional lengths of the various 

 segments, and, as in my original description the terminal joints 

 were missing, I also give the proportional lengths of the various 

 segments in the corresponding appendage of the female for purposes 

 of comparison. 



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

 c^ 78 : S3 : 23 : 33 : 33 : 45 : 23 : 23 : 26 : 39 : 46 : 52 : 58 : 58 : 63 : 

 $ 78 : 39 : 19 : 28 : 28 : 39 : 22 : 32 : 28 : 39 : 48 : 50 : 59 : 63 : 64 : 

 16 : 17 : 18 : 19 : 20 : 21. 

 d" 58 : 49 : 52 : 55 : 58 : 78 = 1000. 



$ 62 : 53 : 56 : 59 : 67 : 78 = 1000. 



The right antenna is as usual modified; the various segments 



have the following proportional lengths : — 



Segments i : 3 : 3 : 4 : 5 : 6 : 7 : 8-9 : lo : n : 12 : 13 : 14 : 15 : i6 : 17 : 



83 : 55 : 20 : 17 : 17 : 14 : 20 : 31 : 27 : 21 : 21 : 31 : 62 : 68 : 75 : 62 : 



18 : 19 : 2021 



= 1000. 



103 : 103 : 171 



Segment 17 bears a tooth-plate which overlaps the proximal 

 end of the following segment ; segment 18 bears a tooth-plate ; 

 segment 19 bears two teeth plates. The tooth-plate on segment 

 17 is unarmed; that on segment 18 has rounded cusps and the 

 tooth-plate on segment 19 bears spine-like teeth on its proximal 

 portion onl3^ the distal part being smooth. 



The 2nd antennae^ mouth-parts and swimming legs are identical 

 with the corresponding appendages of P. binghami 9 . 



The $ih pair of legs very closely resemble those of P. lohipes 

 with which this form was associated in the collection. The 

 right leg : basal i carries a rounded eminence on its margin ; basal 

 2 bears a similar projection ; exopod i is produced in a long spine 

 which is serrated on its inner margin only ; exopod 2 is produced 

 internally in a blunt chitinised tubercle; exopod 3 is curved and 

 slender ; its inner margin is produced about the middle of the 

 length of the segment in a flattened plate, which at its upper angle 

 bears a small rounded tubercle; below the tubercle the margin 

 is armed with a series of small spines and above it the distal 

 margin bears 3 teeth; beyond this plate the distal part of the 



