290 Records of the Indian Museum. [VoL. V, 
gap than the others, and the dental formula is fe In all these 
specimens the first and second upper teeth, as in P. id@, are 
separated by a wider interval than the others, and the two distal 
teeth are usually situated close to each other; the teeth are 
stronger and are placed further apart than in P. id@ ; the first 
three upper teeth are on the carapace. 
The large chelipedes are sub-cylindrical and sub-equal, but in 
the largest specimen they are unequal, the right one being longer 
than the left. The palm is as wide as. or slightly narrower than, 
the distal end of the carpus. The fingers are of equal thickness 
and their tips are incurved, while the tooth on the immobile 
finger is acute; in these respects they resemble P. zde. The 
upper surface of the chelipedes, with the exception of the fingers, 
is beset with very short and slender forwardly directed spinules, 
while the rest of the surface is provided with fewer but stronger 
spinules slightly directed forwards, which are best developed on 
the lower surface; the longitudinal arrangement of the spinules 
is specially marked in the present species. A lateral groove free 
of spinules runs along the outer side of the merus, carpus and 
palm, being most distinct on the carpus. The characteristic 
linear arrangement of these spinules and the presence of a 
lateral groove on the chelipedes are very characteristic of the 
present species; the specific name is taken from the last mentioned 
peculiarity. It may be noted that a similar groove is present in 
P. lay, Fabr. A dark brown mottling occurs on the chelipedes 
more particularly on the fingers. From the largest specimen 
measuring 93 mm. in total length, the following measurements were 
obtained :—- 
Long chelipede (right). 
(TO ils Zoe eCa Ami Adee oor 
Short chelipede. 
itp ea ttle 20s Cua Or = De? 2erminglae 
It should be noticed from the above that the longer chelipede 
is more than one and a half times the length of the body, while 
the shorter one nearly equals it, and that the carpus is shorter 
than the propodus, but longer than the palm, while in P. :d@ the 
carpus is longer than the propodus. 
As in P.id@ the inner sub-terminal spinules on the telson 
project beyond the tip of the latter by about half their length; the 
much shorter outer lateral spinule does not reach the tip 
The anterior surface of the carapace, the exposed upper 
surface of the last pair of abdominal appendages, and the lower 
margins of the abdominal epimera are scabrous. The upper 
surface of the telson is provided with close-set spinules, similar 
to those on the large chelipedes. 
Characters of the female.—It measures 71 mm. in total length. 
The rostrum has an almost straight upper margin, and extends a 
