24 



a high rhomboidal crest. The post-rostral crest is distinct but is broad and 

 blirat, and bifurcates near the posterior border of the carapace. The sinuous 

 ridge defining the branchial region superiorly is more distinct. The 6th ab- 

 dominal somite may be slightly longer than the telson. 



The antennular flagella are 1^ times the length of their peduncle, or even 

 more. 



In the male the merus of the 4th pair of thoracic legs is compressed, and 

 its posterior border is expanded and crest-like, most so posteriorly. 



The last pair of thoracic legs do not reach the tip of the antennal scale : 

 in the male the tooth bounding the notch at the proximal end of the merus is 

 very large, compressed, and recurved : in the female the anterior margin of the 

 ischium is often dilated and compressed so as to form a high crest. 



The andricum is of much the same form, but the spout-like terminations of 

 its distal corners are bifurcate and their free filament is very short. 



The anterior (median) and posterior (lateral) lobes of the thelycum are all 

 of about the same size, so that the organ has much the shape of an ace of clubs 

 without the shaft. 



An exceptionally large female is 3J inches long. 



The collection contains only 13 specimens, registered as follows : — 



8240 



6 

 8241 

 ^6~ 

 8242 



6 

 3924-26 



9 

 7217 



Types of<? J- 

 Types of 5 



9 

 4695 



9 



Mergui. 



Orissa coast. 



G. of Mart!il)an, 20 f;itliom.s. 



Sandheads, E. Hooglily. 



.T. Anderson. 



■ Investigator."' 



J. H. Row. 



6. Metapeneds ensis? (DeHaan) 



? Pen.i'iis monoccroK on.«tV, DeHaan, Fanii. Japon. Crnst., p. 1$)2, pi. xlvi. fig. 2. 

 Kisliinouye, Journ. Fisli. Bureau, Tokvo. VITl. ISIOO, p. ~l. 



? Penu'us iritermedius. 



The specimens which I am inclined to refer to this species are young, and 

 the males may not have acquired their secondary sexual characters. They 

 resemble the young of M. movoccros, and in the semi-final sorting of the collec- 

 tion were assigned to that species; but on final examination, when each speci- 

 men was compared with a standard, they were found to possess three pairs of 



