MARINE CRUSTACEANS. 265 



iii. Var. guttata Rlippell, 1830. Alcock, ill. p. 221. 



On the reef in Goifurfehendu and in the lagoons of Mahlos, Suvadiva and North Male 

 Atolls down to 25 fathoms. 



iv. Var. muculata (Mackay), 1838. Alcock, in. p. 221. 



On the reefs in Goifurfehendu, Male, Fadifolu and Minikoi Atolls, and in the lagoons 

 at Suvadiva and South Nilandu down to 25 fathoms. 



82. Trapezia cymodoce (Hbst.), 1801. Alcock, iii. p. 219. 



The name T. coendea was given by Heller in 1861 to specimens of this species in 

 which the blue tinge, found to a greater or less extent in many individuals, was very 

 conspicuous. The intermediate cases, however, between pure brown examples and those in 

 which blue ijredominates, are so numerous, and form such a complete series, that it is im- 

 possible to keep coendea even as a varietal name. 



On reefs and in lagoons down to 35 fathoms in Male, Minikoi, Goifurfehendu, Fadifolu, 

 South Nilandu, Suvadiva and Felidu Atolls. 



83. Trapezia digitalis Latr., 1825. Ortmann, loc. cit. 

 i. A^'ar. typica = T. digitalis, Alcock, III. p. 222. 

 Dark-brown specimens. 



Taken on the reef at Goidu, Goifurfehendu Atoll. 



ii. Var. formosa Smith, 1869. {Proc Bost. Soc. N. H. Xil. p. 286.) 



This variety differs so sharply from the dark-brown true digitalis that it seems to deserve 

 a separate varietal name. In structure the variety is like digitalis, but it somewhat resembles 

 T. J-erruginea in the shape of the front. This feature, however, varies considerably in digitalis. 

 The earliest name for the orange-coloured form is formosa Smith. T. corallina Gerstaecker, 

 1856, is a coral-red crab. 



84. Trapezia rufopunctata (Hbst.), 1790. Alcock, iii. p. 222. 



Taken on the reef in Male and Fadifolu Atolls, and in 19 fathoms in South Nilandu 

 lagoon. 



Genus Tetralia Dana, 1851. 



85. Tetralia glaberrima (Hbst.), 1790. Alcock, iii. p. 223. 



The black colouring on the front of this species varies in breadth from an almost 

 imperceptible line, through bands of greater breadth, to a suffusion of the whole carapace 

 and limbs with dark coloration, and no purpose would be served by keeping Dana's name 

 nigrifrons. But the colouring of the legs will, I think, be found to fall into definite varieties. 

 The walking legs, in short, may be either: (1) Uniformly yellow. (2) Uniformly dark brown. 

 (3) Yellow banded with dark brown across the middle of each joint. (4) Yellow with a sharp 

 black spot at the end of the meropodites and propodites. (5) Yellow with narrow brown 

 longitudinal strijjes. 



An examination of a long sei-ies of specimens would jjrobably give interesting results. 



Taken on reefs and in lagoons down to 35 fathoms in Goifurfehendu, Fadifolu, Male, 

 Felidu, and Minikoi Atolls. 



34—2 



