74 J. R. KiNAHAN on the Britannic Species of 



Cheraphilus tpinosus \^ Leach sp. ). 



Cranr/on spinosus. Leach, Linn. Trans., xi., p. 346 ; Lam, Hist. Nat. Ms. An. 

 S. Vert, v., p. 202 ; Bell, Brit. Crust., p. 261 ; A. White, 108 ; Thomp- 

 son, Nat. nist. Ireland, v. iv., p. 392. 



Pontophilus. Leach, Mai. Brit., t. xxxvii. A. 



Crangon cataphractus. M. Edwardes, Hist, de Crust., ii., p. 243 (excluding 

 description of female, which refers to ^geon cataphractus of present list, 

 and Risso and Olivi, Cuv. E. A. (Croch.) t. 51, f. 3. 

 l-i jEgeon loricatus. Guerin, Exped. Morce, p. 33. 



'. Rostrum moderately long ^ narrow^ and pointed, concave at the base; ocidar 

 notch narrow, deep, ciliated all round ; carapace contracted, rounded above, armed 

 with five longitudinal rows of teeth on the gastric region, and one on each branchial 

 region ; third and fourth abdominal somites carinafed. ; fifth somite sculptured ; 

 sixth obsoletely bicarinate, sidcate ; telson sulcate, elongate; second pair of cheli- 

 peds half length of first or of third. 



Rostrum very narrow, almost linear for its superior third, not quite attain- 

 ing apex of eyes, but surpassing external angle of orbit, concave above ; orbit 

 much narrower and deeper than Ch. Pattersonii, the eyestalk proportionally 

 much longer, so that the rostrum, though not attaining apex of eyes, as in that 

 species, is really proportionally much longer and more slen(J^; a scries of mi- 

 nute ciliaj clothe the orbit from its external angle to the origin of the rostrum; 

 carapace narrow, somewhat compressed at the sides, rounded above, armed with 

 seven longitudinal rows of well-developed, curved, sharp small teeth, whereof 

 the median gastric region bears one, each lateral gastric two, and each branchial 

 region one, those on the gastric region being the best marked. Botli Leach 

 and Bell do not notice the branchial row of teeth ; but in Leach's specimen in 

 the British Museum I find it present. 



First pair of chelipeds surpassing end of accessory antennal scale ; in its 

 characters it resembles Cher. Pattersonii ; second to fifth chelipeds as Ch. Pat- 

 tersonii, as are also the external maxillipeds and external antennaj ; the anten- 

 nal scale is somewhat narrower, but short. 



