REPORT ON THE BRACHYURA. 
293 
articulated near the antero-internal angle. The chelipedes (as in Calappa) are strongly 
developed ; the ambulatory legs robust, with the joints dilated and compressed. 
In the nearly allied genus, Acanthocarpus, Stimpson, 1 of which I have examined no 
specimens, the carapace as in Cryptosoma is not broader than long, and the merus of the 
outer maxilliped.es (in the type) bears the next joint at its antero-internal angle. It is 
distinguished, according to the descriptions, by the extraordinarily developed carpal spine 
of the chelipede ; but in the figures recently published by A. Milne Edwards, this spine 
is represented as originating from the merus-joint, and is apparently homologous with the 
smaller meral spine of Mursia. 
Besides the species referred to below, Cryptosoma granulosum (cle Haan, Cycldes), 
Japan, and Cryptosoma bairdii, Stimpson, California, belong to this genus. 
Cryptosoma, cristatum (Leach). 
Murcia cristata, Leach, MSS. 
„ „ White (Mursia), List Crust. Brit. Mus., p. 45, 1847, not Mursia cristata , 
auctorum. 
Cruptosorna cristatum, Brulle, Crust, in Webb et Berthelot, Hist. Nat. des lies Canaries, pi. i. 
fig. 2, 1836-1844. 
„ „ Milne Edwards, Hist. Nat. Crust., vol. ii. p. 110, 1837. 
,, „ Lucas, Ann. Soc. Entom. France, ser. 6, vol. ii., Bulletin, p. cxv., 1882. 
„ dentatum, Brulle, tom. cit., p. 17, 1836-1844. 
Cape Verdes, St. Vincent, July 1873. (Four males, adult and young, and a female.) 
The largest male has the following dimensions : — 
Adult $ . 
Lines. 
Miilims. 
Length of carapace, about 
241 
52-5 
Breadth of carapace, about 
25|- 
54 
Length of a chelipede, 
32 1 
68-5 
The ambulatory legs are imperfect. 2 
Family II. Matutid m. 
Matutidx , Dana, U. S. Explor. Exped., vol. xiii., Crust. 1, p. 390, 1852. 
Characters of Calappidse except as regards the exterior maxillipedes, whose endognath 
has the carpal and following joints concealed by the triangular acute merus-joint. 
1 Bull. Mus. Comp. Zodl., vol. ii. p. 153, 1870. 
2 The locality of Leach’s type is “Africa” and not “Indian Ocean,” as stated by White, tom. cit., who substituted 
the latter mentioned for the original locality, both in the Register and Collection of the Museum, for what reason I 
know not. This species is recorded by Studer ( Abhancll . d. k. Akad. d. JViss. Berlin, p. 15, 1882), from Porto Praya, 
Cape Verde Islands, in 10 to 30 fathoms. 
