306 MR. BELL, HORZ CARCINOLOGICÆ ; 
External foot-jaws, sternum. and abdomen covered with distinct large and elevated 
granulations. Abdomen in the male elongate triangular; the first and second segments 
transversely linear, the third, fourth and fifth united, with a minute tooth at the poste- 
rior angles, two rounded elevations on the hinder portion, and a slight mesial carina; the 
sixth segment oblong quadrate, the posterior margin armed with a strong tooth projecting - 
backwards. First pair of legs very irregular, the arms tuberculated and granular; the 
hand nearly as broad as it is long, distinctly carinated on the outer side; fingers nearly 
touching each other throughout their whole length, and slightly tuberculated. 
Colour pale brown; the hollows of the carapace grey: there are four minute red dots 
on the abdomen. | 
Length of carapace 077 in., breadth 0:6. 
Two specimens (males) were obtained by Mr. Cuming, at Puerto Portrero, Central 
America, on fine sand, at thirteen fathoms. 
Genus OREOPHORUS, Rüppell. 
Cuar. GEN.— Testa tuberosa, postice supra pedes dilatata. Fosse antennarie oblique. Pedipalpi externi 
caule exteriore arcuato, apicem versus sensim angustiore. Pedes anteriores longi, robusti; octo 
posteriores subæquales, sub scuto dorsali reconditi. Abdomen Marıs?—Fa&mına latè ovatum, 
segmentis à tertio ad sextum coalitis. 
This genus, established by Rüppell, constitutes the sole form of the present family 
which can be considered as offering a distinct approach to any other in its general 
characters. Its relation to the Calappade, and particularly to the typical genus of that 
family, has been already adverted to; and the principal character by which it is allied to 
that group, and by which also the genus Calappa is distinguished from its congeners, 
namely the latero-posterior expansion of the carapace, by which the ambulatory legs are 
capable of being concealed, obtains in all the species at present known. The species first 
discovered, and on which the genus was founded by Dr. Rüppell, was described and 
figured by him in his work on the Crustacea of the Red Sea. A second species was 
obtained by Mr. Adams in the Straits of Sunda, and appears in the Natural History 
(Crustacea) of the Voyage of the Samarang; and a single specimen of a third, now first 
described, the habitat of which is unknown, exists in the British Museum. 
There is a certain approach to this genus in the general aspect of Lithadia, particularly 
in the hollows and elevations of the shell. 
OREOPHORUS HORRIDUS, Rüppell. Test subtriangulatä, regionibus branchialibus fortiter 
et obliqué carinatis; chelis mediocribus, manu digitis longiore. 
Oreophorus horridus, Rüppell, Krab. der Roth. Meer. p.19.t.4.f.5. Edw. Hist. Nat. Crust. ii. p. 131. 
Hab. in Mari Rubro. | 
The discovery of two other species since Rüppell’s publication has rendered a new spe- 
eifie distinctive character necessary. The strong deep carina extending obliquely across 
each branchial region distinguishes it from both the others, and the comparatively normal 
form of the claws from O. reticulatus. | 
