MONOGRAPH OF THE LEUCOSIAD^. 307 



Oreophortts reticijlatus, Adams and White. Testa, subpentagon^, reticulata; digitis 

 maximis, manu bis longioribus. 



Oreophorus reticulatus, Adams and White, Crust. Voy. of the Samarang, p. 54. t. 6. f. 1. 

 Hab. in Mari oricntali. Mus. Brit. 



Readily distinguished from the other species by the enonnous development of the 

 fingers, the immoveable one being half as long as it is broad, and both twice as long as 

 the hand. It is beautifully figured in the work above referred to. 



Oreophorus nodosus, mihi (Tab. XXXIII. fig. 8). Testa, nodosa, margine undato; 



manu tiunid^, ad margines carinata, bisulcata, digitis longiore. 

 Hab. ? Mus. Brit. 



Carapace generally rugose, but without the deep hollows which are seen in O. reticu- 

 latus, or the regular elevated carina? on the branchial region of 0. horriclus. It is of a 

 general semicircular form, with irregularly waved margin, a strong projection on the 

 hepatic region, a large prominence on the anterior, and a double one on the posterior part 

 of the branchial region ; front emarginate. External pedipalps with the outer stalk slightly 

 arched ; the inner with a longitudinal groove close to the inner edge, and a slight carina 

 along the middle Une. Anterior legs of moderate length and size, the arm nodose, the 

 hand inflated, with two longitudinal sulci, and an external and interaal carina ; the fingers 

 slender, curved, and shorter than the hand. The abdomen is wanting in the only specimen 

 knoA\Ti, which is a male. 



Length of carapace 0"7 in. ; breadth 0"8. 



The specimen in the British Museum is, I think, doubtless an old and faded one, and is 

 consequently thin and slight compared with its original condition. It is of a delicate pink 

 coloiu". 



Genus Nursia, Leach. 



Char. Gen. — Testa polyhedra, fronte producto. Orbita extrorsum aperta. Fossce antennarm transversae. 

 Pedipalpi externi caule exteriore curvo, dilatato, antice et postice obtuso ; caule interiore margine 

 interno recto, articulo penultimo quadrate, ultimo triangulari. Pedes antici digitis deflexis. Abdo- 

 men Maris articulo penultimo apicem prope processu dentiformi instructum. 



Ntjrsia plicata, Herbst (Tab. XXXIV. fig. 4). Testa utrinque 4-dentata, medio tuber- 

 culis tribus triangulum delineantibus, postice linea elevate, transversa tuberciilum 

 gerente, fronte 4-dentato. 



Cancer plicatus, Herbst, iii. No. 253. t. 59. f. 2. 

 Nursia Hardwickii, Leach, Zool. Misc. iii. p. 20. 

 Hab. in oceano Indico. Mus. Brit. 



Carapace somewhat broader than it is long, produced anteriorly, gi'anulated ; a notch 

 between the hepatic and branchial regions, the latter ttmiid, broadly margined, the mar- 

 gin with four obtusely triangular dentiform projections, of which the posterior are the 

 most prominent, projecting considerably beyond the line continued from the lateral mar- 

 gin of the carapace. The anterior regions are carinated, and an elevated line runs between 

 the hepatic and branchial regions, each terminating in a tubercle, which, with its feUow 



vol. XXI. 2 s 



