1895.] A. Alcock— New Species of Oxyrhynch Crab . 297 
tooth. The hepatic regions are rounded laterally, not strongly angulat- 
ed as they are in P. horrida and spinosissima. The external maxillipeds, 
when closed, have the inner edges in the closest contact throughout. 
The chelipeds have the merus very short and squat-its breadth 
about two-thirds of its length-with two compressed teeth on its 
short anterior (inner) border, a few blunt teeth followed by a blunt 
lobe on its posterior (outer) border, a strong tubercle in the middle of 
its upper surface, and numerous pearly tubercles aud nodules on its 
lower surface : the carpus is granular and pustular : the hand has five 
sharp almost equal sized teeth on the lower border (two of them being 
on the immobile finger), several large nodules on the outer surface, and 
several large unequal sized spiny lobules on its inner surface: the 
mobile finger is spiny. 
The ambulatory legs are compressed: the merus is compressed- 
trigonal, with the edges, especially the anterior edge, spiny: the carpus 
is indistinctly nodular: th e propodus is also slightly nodular, with a few 
spinules on its posterior margin : the dactylus is closely covered with 
spinules up to its tip. 
The sternum, in the female, is excavated between the chelipeds. 
The abdominal terga, in the female, are raised into strong quadran¬ 
gular convexities down the middle line, and on either side near the 
edge. 
hoc. —Pedro Shoal, P depth; and Laccadives, 28 fms. 
Length of carapace of largest specimen (female) 45 millim., great¬ 
est breadth 61 millim. 
The position of the above species in the hey to the Indian species 
of the genus Parthenope, page 279 ante is thus shown :— 
I. Carapace remarkably rugose (or spinose); chelipeds of the 
ordinary Lambrus form :— 
1. Carapace somewhat pentagonal, not vertically 
deflexed from the front of the gastric region: 
abdominal terga of the female with a series 
of large eroded pits down either side.. P. horrida. 
2. Carapace somewhat equilaterally triangular, 
vertically deflexed from the front of the 
gastric region: abdominal terga of the female 
with a series of convexities or nodules down 
the middle line, and on either side— 
i. Edges of carapace very strongly spinate : car¬ 
pus of chelipeds and of ambulatory legs 
(like all the other parts of the body) 
strongly spinate: abdominal convexities 
of female spinate t «• t. P. spinosissima. 
