e.VMMAHIDJ!:. b5 



ungiiiciilatc ; second pair developed into perfect chelae. Posterior 

 pair of pleopoda uuibrunched. TcLson double. 



This genus may readily be confounded vrith. Anonyx and Lys'ia- 

 iiassa, unless the gnathopoda and telson be examined. 



1. Callisoma crenata. (Plate XIV. fig. 5.) B.M. 



Scopelocheirus crenatus, Speiice Bate, Brit. Assoc. Report, 1855 ; SyU' 

 opsis, Ann. Xat. Hid. Feb. 1857. 

 White, Hist. Brit. Criist. p. 107. 



Cephalon furnished with a short flat rostrum ; infero-anterior angles 

 produced. Eyes small, reniform, ha^ing black spots on a white 

 ground. Superior antenna; ha%-ing the peduncle very large at the 

 base ; first joint much larger than the two succeeding ; third 

 almost enclosed within the second ; flagellum with the first 

 joint pyriform and nearly as long as all the rest, which consists 

 of six or seven joints ; secondaiy appendage imiarticulate. In- 

 ferior antennae about one-thii-d the entire length of the animal, 

 very slender and delicate ; the pedimcle reaches quite to the ex- 

 tremity of the peduncle of the superior. The fii'st pair of gnatho- 

 poda have the dactjlos developed into a brush of short curved 

 hairs, all traces of the typical form being lost ; propodos cylin- 

 drical, and fringed with strong curved hail's near the extremity ; 

 carpus longer than the propodos. Second pair of gnathopoda 

 chelate, the propodos having the inferior angle anteriorly produced 

 and unguiculate, forming ^\dth the dactylos a perfect claw ; carpus 

 as long as the propodos. Third pair of pereiopoda shorter than 

 the fourth and fifth, ha^'ing the meros posteriorly squamiformly 

 developed ; fourth and fifth pairs having the meros cylindrical. 

 Fourth segment of the pleon with a deep notch across the dorsal 

 surface. Posterior pair of pleopoda much longer than the two 

 preceding, TeLson carrying a solitary subapical hair upon each 

 division. 



Length ^ths of an inch. 



Hub. Banff (Mr. Edward) ; Macduff, from a haddock's stomach, 

 from 30 to 40 fathoms (Mr. Gregor) ; Plymouth Soimd (C. S. B.). 



The specimen from which the figure and description are taken 

 was dredged in Plymouth Sound ; when alive it was of a bright 

 lemon-colour, -with a white border to each plate, the whole being 

 covered with small black spots. The other specimens were dead 

 before I received them ; they were generally fawn-colour, tending 

 to bluish-grey towards the back. This api)earance, together with 

 their being less compressed than Anony.v or Lyxianassa, enable<l 

 them readily to be recognized. 'J'hc notch upon the fourtli segment 

 of the i)k'on is an unerring feature. 



