62 J. R. KiNAHAN on the Britannic Species of 



Cranjon vulgaris. Fabric, sup., 410 ; Lat. Crust., vi., p. 2G7, t. Iv., f. 1, 2 ; 



Leach, Mai. Brit., t. xxxvii. B. ; M. Edw. Crust., ii., 341 ; Bell, Brit. 



Crust., p. 256, f. ; White, Pop. Brit. Crust., p. 107, pi. viii., fig. 2 ; Guerin, 



Icon. R A., t. 20, fig. 4. 

 Crangon septemspinosa. Say, Journal, Ac. Sc. Philadelph., i. 246 ; De Kaj', 



Zool. New York, vi., p. 25, t. 8, f. 24. 

 Squilla cinerea. Klein, F. 

 Crago vulgaris. Lam. Syst., p. 159. 

 Cancer Crangon. Linn. Syst., 1052, 67. 

 Squilla marina batava. Baster Subs., 2-27, t. 3, fig. 1. 4. 



Crangon vulgaris of Dana and of Owen is not this species, but Crangon ni- 

 gricauda of Stimpson : it is found on the south and west coasts of America. 



Rostrum very short, narrow, slightly rounded at ap>ex, concave above ; ocular 

 notch, and sides of rostrum ciliated ; carapace armed ivith one median gastric and 

 two branchial teeth {one on each side) ; abdomen smooth, narrowed ; telson triangu- 

 lar, smooth ; second pair ofchelipeds as long as the first or third. 



Rostrum only lialf length of eye-stalks ; concave above ; ocular notch mo- 

 derate, ciliated all round. Carapace large, rounded, slightly depressed, a raised 

 ridge running backwards and outwards continuous with base of rostrum. 

 Median gastric region furnished with a small acute tooth. A pointed curved 

 tooth on each branchial region, on a line slightly in advance of the median 

 tooth. 



External antcnnai moderate in length ; peduncle about half length of ac- 

 cessory scale, wliich terminates in a tooth, and is haired along its inner edge. 

 Internal antenna3 bifilamentous, moderate in length. 



External maxillipeds long, extending beyond peduncles of external an- 

 tennaj ; terminal joint long. First pair of chelipeds robust, smooth, except 

 tooth on propodos, and a small pointed tooth on mcros (fourth articulation). 

 Propodos nearly quadrilateral ; sides parallel ; palm nearly transverse, rounded. 

 Dactylos long, curved, and spiniform. 



Second pair of chelipeds slender, didactyle ; hand long ; whole limb longer 

 than first pair, and as long as third pair, carried folded up beneath first. Three 



