CRUSTACEA. 289 
13. Petrolisthes Tenkatei n. sp. 
ETR 
Eight specimens of different size, viz. seven males and 
one ova-bearing female were collected at Hndeh, Flores, 
by Dr. ten Kate, whom I have much pleasure to dedicate 
this new species. 
Petrol. Tenkatei belongs to those species the cepha- 
lothorax of which is neither armed with a su- 
pra-ocular — nor with an epibranchial tooth, 
and is most closely allied to Petrol. leptocheles Heller from 
the Red Sea, to Petrol. hastatus Stimps. and Petrol. japo- 
nicus de Haan from Japan, and to Petrol. inermis Heller 
that occurs at the Nicobar Islands, at the Mergui Archi- 
pelago and on the shores of Java and Flores. 
The cephalothorax has nearly the same form as that of 
Petrol. inermis Heller, is still a little broader than long 
and is distinguished by this character at first sight from 
Petrol. elongatus M. E. and Petrol. unilobatus Henderson, 
the cephalothorax of which is considerably longer than 
broad. The whole upper surface of the cephalothorax , which 
is glabrous and shining, is a little punctate on the 
middle and posteriorly , the little points being somewhat more 
distant from one another on the mesogastric and on the 
cardiacal regions than more laterally; as usually transverse 
elevated lines are observed near the lateral margins and 
also on the front and as usual a transverse elevated crest 
is found immediately behind the imaginary line that uni- 
tes the external angles of the orbits. The little prominent 
front is triangular, and shows the ordinary mesial furrow, 
by which the postfrontal crest is interrupted, and on either 
side of it an oblique lateral one, that separates it from the 
upper margins of the orbits. The front is rounded at the 
apex anteriorly, but the lateral margins ofit are but very 
slightly emarginate, sothat lateral lobes can 
hardly be distinguished. The lateral margins of the 
front, as also the concave upper margins of the orbits, 
Notes from the Leyden Museum, Vol. XV. 
19 
