MARINE CRUSTACEANS. 



267 



the orbit than from that which marks the junction of the antero- and postero-lateral edges, 

 and rather smaller than the latter spine. (3) The upper, inner angle of the orbit is not 

 spiniform, but is somewhat raised. 

 The minute teeth which edge both 

 the upper and lower rims of the 

 orbit are, on this angle, increased 

 in size and set farther apart, so 

 that one or two of them can just 

 be seen with the naked eye. 

 (4) The chelipeds are frosted over 

 with tiny granules as in some 

 varieties of Q. coronata. The 

 granules are somewhat larger 

 underneath the hand. (.5) The 

 arm is rather shorter than in Q. 

 coronata. (6) There are few thorns 

 on the end-joints of the legs, but 

 these joints are very hairy. (7) The 

 colour in spirit is a rich orange- 

 brown, paler on the walking legs 

 and fingers. 



A female with eggs was 

 dredged in 25 fathoms in Addu 



Atoll. 



Fig. 58. Quadrella hispiiwsa; a. whole animal, b. part of outside of hand 

 enlarged to show the scales, c. end of walking leg enlarged. 



Subfamily Oziinae. 



It is somewhat remarkable that the collection contains no example of this subfamily, 

 whose genera {Ozius, Epixanthus, Euruppellia and Baptozius) contain several very common 

 species which have been recorded from surrounding localities such as India, Ceylon, the Red 

 Sea, and the Seychelles. Both Alcock (foe. cit.) and Ortmann {Zool. Jahvh. Syst. Vil.) oc- 

 casionally report species from the Maldives or Laccadives, but neither of them mentions a 

 member of the Oziinae from those islands. 



Genera incertae sedis. 



Genus Gaecopilumnus, n. 



Among the decapods taken on the reef at Naifaro in Fadifolu Atoll is a small, Pilumnus- 

 like crab whose orbital region has undergone a remarkable transformation, so that the animal 

 appears to be absolutely blind. In a few words, this transformation consists in the orbits 

 becoming very small, almost on the underside of the carapace, and completely filled by 

 the eyestalks, while the small cornea lies on the underside of the stalk and is hidden in 

 the orbit, so that the outline of the body is quite unbroken over the area where the open 

 orbit should lie. 



I propose to establish for this crab a new genus, under the name of Gaecopilumnus, 

 with the following characters: (1) Carapace roughly square, convex both fore and aft and from 



