2G FOSSIL MALACOSTRACOUS CRUSTACEA. 



long ; the inner margin with a row of strong spines, directed forwards, the rest smooth and 

 rounded ; the fingers nearly as long as the hand, compressed, strongly tuberculated for 

 half its length towards the extremity ; the immovealile finger falcate ; the smaller hand 

 very slender, with a strong, rounded ridge on each side ; the inner margin with a row of 

 spines as in the larger hand ; the fingers slender, linear, and nearly straight. 



Length of the carapace 1'5 inch, of the rostrum 0-5 inch, of the legs about S inches. 



Found in the Gault at Folkestone, from which locality there are several specimens in 

 the British Museum, and in Mr. Carter's collection, as well as in the Woodwardian 

 Museum at Cambridge, there are numerous fragments which appear to belong to this 

 species. 



Obs. This species is sufficiently distinguished from the others found in the Gault 

 and Greensand by the remarkable spinous armature of the gastric region and of the 

 inner margin of the hand, and by the falciform construction of the immoveable finger of 

 the larger hand. 



IIoPLOPARiA LONGiMAXA, sp., Somerhy. Plate VL 



Manibus inequalibus longissimis ; altera gracili, digitis fere linearibus, nianu longio- 

 ribus ; altera ovali, digitis curvis, manu brevioribus. 



AsTACUS L0N6IMANUS, Soiverby. Zool. Journ., ii, p. 493, t. xvii. 

 HoPLOPARiA. LONGiMANA, M'Coij. Aim. Nat., 1819, p. 176. 

 — — Morru. Cat., p. 109.. 



Descr. The carapace is somewhat uneven, and everywhere granulated, more coarsely 

 on the gastric region, very minutely on the branchial, without spines or other armature, 

 excepting two tubercles on the hepatic region ; the nuchal and branchial furrows conspi- 

 cuous, but not deep ; the rostrum half as long as the carapace, extremely slender and 

 longitudinally sulcate; the supra-orbitar spine nearly as long as the rostrum. The 

 abdomen is smooth, sparsely and minutely punctate, the puncta becoming more frequent 

 and conspicuous on the cpimeral plates, which are marked with a shallow, even furrow 

 within the margin ; the exterior plate of the tail rounded at the extremity. The anterior 

 pair of legs arc of very unecpial size and of dissimilar form ; the arm is nearly as long as 

 the hand, the wrist about half as long ; the claws differ greatly ; the larger hand is rather 

 longer than the fingers, of a nearly oval form, obtusely carinated on the outer margin, the 

 fingers curved and armed with strong tubercles on the opposing edges ; the smaller hand 

 is slender, shorter than the fingers, which are nearly linear, and furnished with a con- 

 tinuous series of small, sharp, triangular teeth. 



Length of the carapace 2 inches ; breadth, taking the curve from one margin to the 



