124 



2. Gecarcinucus (Gecarcinucus) edwardsi, Wood-Mason (name only). 



(Fig. 35.) 



This species is represented by a single male, not full grown ; compared 

 with a male of G. jacquemontii of its own size, it shows the differences specified 

 below. One marked difference, emphasising the concordance between the idea 

 " Gecarcinucus " and the idea " Paratelphusa," occurs in the shape and propor- 

 tions of the front, which are almost intermediate between the two "genera." 



The difference from G. jacquemontii is as follows : — 



Though the carapace is hardly less convex and subcylindrical, its individual 

 regions are not so tumid and lobe-like ; this is partly because the " cervical 

 groove," though otherwise similar, is not so deeply impressed. 



The length of the carapace is nearer three-fourths than two-thirds its 

 greatest breadth. 



Short oblique ridges, very plain to the naked eye, stud the side-walls of the 

 carapace and pass across its lateral borders in places. 



The front is broader — the maximum diameter of the orbit being a bare 

 three-quarters of the width of the front^ — and its sides, instead of being parallel, 

 are oblique. 



The bay at the lower outer corner of the orbit is longer. 



The post-orbital crests distinctly follow the upper border of the orbit, in 

 close proximity to it, almost to the edge of the carapace. 



In the male abdomen, though it is otherwise similar, the length of the 6th 

 segment is only equal to its distal breadth. 



In the chelipeds the surface of the merus and carpus is more rudely 

 rugulose, and the surface of the carpus and hand is more thickly pitted. 



In the cheljE the straight, close-set rows of small, and very uniform and 

 regular, translucent teeth exist near the tips of the fingers as in G. jacquemontii, 

 but in the basal half of the fingers the place of teeth is taken by a thick mat of 

 hair, which also fills the finger-cleft and extends over a considerable area of the 

 inner surface of the palm. 



In the unique male the carapace is i.Hhs inch long, IfV inch broad, and 

 nearly xirths inch deep. 



6942 

 3 ■ 



Khandalla. F. Stoliczka. 1 <? (type). 



Subgenus II. — Cylindrotelphusa. 



Type : 'Cylinclroteljyhusa steniops. 



The species separated as the type of this subgenus connects Paraielj^husa 

 and Gecarcinucus ; and strengthens the view that Gecarcinucus itself is merely 



