616 



large and tumid, without any spines, but produced at the end posteriorly to a 

 strong dentiform projection, accompanied by another somewhat smaller projec- 

 tion, last peduncular joint much shorter and narrower than the penultimate 

 one, and having inside 2 short dentiform projections, the one near the base, 

 the other at the end. Gnathopoda nearly as in C. grosses, except that the 

 dactylus of the posterior ones is armed near the tip with a lateral denticle. 

 Anterior pairs of pereiopoda with the meral joint very much expanded, and 

 the carpal one very short, dactylus longer than the propodal joint. Last pair 

 of pereiopoda somewhat more slender than in C. grossipes, otherwise of a very 

 similar structure. Last pair of uropoda with the terminal joint oblong oval 

 in form, and nearly twice as large as the basal one. Telson obtusely rounded 

 at the tip. Body whitish, variegated with a light brown pigment. Length 

 of adult female 5 mm., of male about the same. 



Remarks. This species was first described by Bruzelius from the 

 Bohuslan coast, and has subsequently been recorded from several other places 

 by different authors. The C. splnicorne of Sp. Bate is without any doubt 

 the female of this species. On the other hand, the C. acherusicum of Costa, 

 which is believed by Heller and Boeck to be the same species, seems to me 

 to be different. The species is easily distinguished from C. grossipes by the 

 rather different structure of the antennae in both sexes, as also by the distinctly 

 projecting rostrum and the acuminate lateral lobes of the cephalon, and finally, 

 by the segments of the urosome being fused together. 



Occurrence. The species occurs along the whole Norwegian coast, 

 from the Christianiafjord to Vadso, in depths varying from G 20 fathoms, 

 muddy bottom, and is in some places found even in great abundance. 



Distribution. British Isles (Sp. Bate), Bohuslan (Bruzelius), Kattegat 

 (Meinert), Dutch coast (Hoek), coast of France (Chevreux); Jan Mayen (Norw. 

 North. Atl. Exped.). 



6. Chorophium Bonelli, M.-Edw. 



(PL 221, fig. 1) 

 Bonelli, Milne-Edwards, Ann. d. Sc. nat. XX, p. 385. 



Body somewhat robust, with the segments of urosome fused together. 



Cephalon without any rostrum, lateral lobes short and rounded at the tip. 



Coxal plates about as in C. crassicorne. Eyes comparatively larger than in 



' preceding species, with very dark pigment. Superior antennee about 



equalling in length Vs of the body, 1st joint of the peduncle shorter than 



