^4. E. Verrill — Decapod Crustacea of Bermuda. 



429 



It appears to be nearly allied to Hapalocarcinus marsupialis Stimp- 

 son,* which forms curious " houses " among the branches of Pocillo- 

 pora co'spitosa. The branches of the coral, in the latter case, grow 

 up around the crab and enclose it, leaving several small apertures 

 for the entrance of water and food, but from which the crab cannot 

 emerge. 



In the latter, however, the front of the carapace is flat, not bent 



downward, and it does not serve for an operculum, which is not 



needed in its case. 



4!) 



Figure 49. — Troglocarcinus corallicola ; a, dorsal view, x about 4 times, of a 2 

 removed from its den in a coral (Mussa), from Dominical.; b, a smaller S 

 specimen, x about 4 times, ventral view ; the abdomen, legs, outer max- 

 illipeds, and antennules are removed, except one basal antennular segment ; 

 c, the same, another ? example ; dorsal view, x 4. Phot. A. H. V. 



It is, j^erhaps, more closely allied to Cryptochirus coralliodytes 

 Heller,f from the Red Sea and Maldives, which lives in the same 

 manner, in dens in Leptoria ( = 3fceandra). 



The latter, however, has a differently formed carapace, smooth, 

 convex in front, without marginal spines ; orbits simple, without 

 spines ; and very different maxillipeds. 



* Proc. Boston Soc. Nat. Hist., vol. vi, p. 412, 1859. Caiman, Trans. Linn, 

 Sec. London, ser. 2, vol. viii, p. 43, pi. iii, figs. 29-40, 1900. M. J. Eathbun, 

 Cnist. Hawaiian Is., U. S. Fish Com. Bulletin, for 1903, part iii, p. 892, 1906. 



f Heller, Cam., Sitzungsb. Math.-Naturwiss. Classe. Akad. Wissenschaften, 

 Wien, xliii, i, 1861, p. 366, pi. iv, figs. 33-39. 



