382 MR. J. R, HENDERSON— A CONTRIBUTION 



following differences can be made out : — The carapace is less flat, and the frontal margin 

 more concave ; the epibranchial and external orbital teeth are much larger and more 

 prominent, with the margin connecting them less oblique ; the postfrontal ridge is 

 separated by a wider interval from the orbital margin, the orbits are larger and more 

 open, the carpal spine of the chelipedes is acute and more prominent, and the general 

 colour is apparently not so dark as in T. lugubris. The carapace is also proportionately 

 longer when compared with the breadth, as shown by the following table, in which 

 individuals of both species, of the same sex, and as nearly equal in size as the series 

 would permit, are compared : — 



1. A young Female. 



Breadth between epibranchial teeth . 

 Length of carapace 



2. An adult Mule. 



Breadth between epibranchial teeth 

 Length of carapace 



The largest specimen, a male, is 39 - 5 mm. long, and the greatest breadth of the 

 carapace 52 mm. ; the distance between the epibranchial teeth 45 mm., and between the 

 external orbital angles 29 mm. ; breadth of front 12 mm. 



T. Masoniana is perhaps a representative on the plains of T. indica, as T. lugubris may 

 be on the hills. I have associated it with the name of Prof. Wood-Mason of Calcutta. 



130. Telphusa Leschenaulti (Milne-Edw.). 



T. Leschenaulti (Milne-Edw.), A. Milne-Edwards, Nouv. Arch. Mus. Hist. Nat. t. v. p. 165, pi. viii. 

 fig. 3 (1869). 



Ganjam {Day) ; Madras, common in wells and ponds, also met with burrowing iu rice- 

 tields and in all the larger compounds (J. R. H.) ; Ceylon (Brit. Mus.). 



The carapace and limbs are visually mottled with minute dark brown spots. An adult 

 male from Madras has the carapace 28"5 mm. long, and 37 mm. in greatest breadth. 



Distribution. Ceylon ; Pondicherry ; Madras ; Malabar ; Nicobars ; also recorded from 

 Mauritius and Tahiti. 



131. Telphusa rtjgosa, Kingsley. 



T. rugusa, Kingsley, Proc. Acad. Nat. Sci. Philad. p. 37 ( 1880) . 



Pundaloya, Ceylon (E. E. Green) ; Ceylon mountain streams, a series (Eoldsworth). 



As the specimens collected by Holdsworth were referred without hesitation by Miers to 

 this species, I venture to supplement the very brief original description by the following 

 account : — The carapace is subquadrate and depressed. The postfrontal ridge, though 

 interrupted, is well-defined, and the edge crenulated ; the median portion bounding the 

 epigastric lobes is placed well in front of, and quite separate from the lateral portions, 

 which are sinuous and curve slightly forwards to pass into the well-marked epibranchial 



