SULCATOR. 187 



A MPIIIPODA . PHOXIDES. 



NATATOItIA 



Genus— SULCATOR. 



Sulealor. Spence Bate, Ann. Nat. Hist. vol. xiii. p. 504, 1854 ; xix. 



p. 140. Rep. Brit. Assoc. 1855, p. 58. Cat. Ampli. Biit. 



Mus. p. 112. White, Hist. Brit. Crust, p. 174. Gosse, 



Marine Zool. p. 142. 

 Bellia. Spence Bate, Ann. Nat. Hist. vol. vii. p. 318, 1851. 



Generic character. Cephalon anteriorly produced. Gnatho- 

 poda small, imperfectly subchelate. Pereiopoda having the 

 dactyla obsolete, most of the joints squamously developed. 



The head is developed anteriorly, and produced cen- 

 trally to a point. The body of the animal is much 

 distended, the centre, however, not being materially 

 wider than the other portions. The third segment of 

 the tail is remarkably long, and has the lateral walls 

 considerably developed, so that the three posterior seg- 

 ments of the tail, together with their appendages, lie 

 folded within it, seldom appearing extended. 



The eyes are small. The superior antennae are fur- 

 nished with a secondary appendage. The coxae are 

 large. The arms are feeble and imperfectly subche- 

 late. The walking legs have all the joints developed in 

 the form of large plate-like scales, except the fingers, 

 which are represented by a few stout spines. The last 

 pair of caudal appendages are double-branched, and the 

 central tail-piece is single, but cleft. 



This genus bears a near resemblance to that described 

 by Say, under the name of Lepidactylis , in the " Pro- 

 ceedings of the Academy of Philadelphia," vol. i. p. 2. 



