372 ME. J. E. HENDEESON — A CONTETBTJTION 



Genns Sctlla, De Haan. 



102. Sctlla serrata (Foiskal). 



S. serrata (Forsk.), A. Milne-Edwards, Nouv. Arch. Mus. Hist. Nat. t. x. p. 349 (1861). 

 Calcutta (Daij) ; Ceylon {Eahj). Abundant in the S. Indian backwaters {J. B. R.). 

 This is the chief edible crab of India. 



Distribution. From the Red Sea, E. and S. Africa, to Japan, the Fiji Is., and New- 

 Zealand. 



Genus Thalamita, Latrcille. 



103. Thalamita prymna (Herbst). 



T. prymna (Herbst), De Man, Mergui Crust, p. 75, pi. iv. figs. 5, 6 (1887). 



Rameswaram and Tuticorin {Thurston). Rameswaram, common between tide-marks ; 

 Madras {J. B. E.). 



These belong to the typical form of the species as characterized by De Man. The 

 carapace is smooth, with the exception of the lirst transverse line, placed behind the 

 orbital margin, which usually carries a fringe of hau's ; the natatory legs are also pro- 

 vided with a short marginal fringe. The ridge on the basal joint of the antennal 

 peduncle has two or more spinules, the first of which is well-developed, acute, and 

 usually with traces of a compound origin. 



A male from Rameswaram has the carapace M mm. long and 62 mm. broad, the 

 right hand 52 mm. long. A female from Tuticorin is 32 mm. long and 15 mm. broad, 

 the right hand 32 mm. long. 



Distribution. Indian Ocean, Mergui, Malay Archipelago, Japan, Australia, New 

 Caledonia. 



104. Thalamita Admete (Herbst). 



T. Admete (Herbst), A. Milne-Edwards, Nouv. Arch. Mus. Hist. Nat. t. x. p. 35« (1861). 



Rameswaram {Tlmrstou, J. B. II.) ; Gulf of Martaban (Gates). 



The carapace is only sHghtly pubescent, and the clielipedes are devoid of granules. 

 The outer surface of the hand is glabrous, and only carries faint raised lines, the usual 

 spines being present on the upper surface. 



A female with ova is 10 mm. long and 15 mm. broad. 



Distribution. From the Red Sea and Natal to Ousima Is., the Fijis, and the SandAvich 

 Islands. 



105. Thalamita Savignyi, A. Milne-Edw. , 

 T. Savignyi, A. Milne-Edwards, Nouv. Arch. Mus. Hist. Nat. t. x. p. 357 (1861). 

 Tuticorin, many specimens {Thurston) ; Rameswaram {J. B. E.). 



This species only differs from T. Admete in having the carapace more strongly granu- 

 lated, as well as the chelipedes, the hand being provided with several longitudinal 

 granulated lines on its outer surface, and granules are scattered over the intervening 



