236 AMPniroDA nokmalia. 



of tlic animal ; first joint of the pednnclo as long as the cophalon, 

 ha\'iug the distal extremity abruptly truncate ; second joint as 

 long as the first, but narrower ; third very short, scarcely more 

 important than the first joint of the fiagellum ; fiagellum about as 

 long as the peduncle. Infeiior antenna) about two-thirds as long 

 as the animal; peduncle having the penultimate joint reaching 

 nearly to the extremity of the penultimate joint of the peduncle of 

 the superior, last joint of the peduncle nearly as long as the two 

 preceding ; fiagellum rather longer than tho last joint of the pe- 

 duncle. First pair of gnathopoda having the propodos but slightly 

 dilated, increasing in diameter towards the palm ; palm oblique, 

 smooth, imperfectly defined, against which the dactylos closely 

 impinges. Second pair of gnathopoda having the cai-pus dilated, 

 continuous with the propodos ; propodos large, diagonally quadrate ; 

 palm obHque, defined by an obtuse angle. Fii'st two pairs of pereio- 

 poda having the basa dilated ; last three pairs reversed, having 

 the propoda dilated to an obtuse lobe at the posterior distal 

 extremity. 

 Length ^ of an inch. 



Hah. Penzance {Mr. Barlee). 



I had previously thought that the short upper antennae would di- 

 stinguish this species from the rest of the genus ; but perceiving that 

 the peduncle of the upper antennae is generally shorter and never 

 longer than that of the lower, the difference between them respectively 

 consists only in the greater or less length of the fiagellum of the upper 

 organ — a fact of but secondary importance. 



5. Amphithoe lacertosa. (Plate XLI. fig. 5.) 

 Aniphithoe lacertosa, Silence Bate, Ann. Nat. Hist. 3rd ser. i. p. 362. 

 Eyes ovate. Superior antennae about half the length of the animal ; 

 ' fiagellum a little longer than the peduncle. Inferior antennae a 

 little shorter than the superior ; peduncle not longer than the pe- 

 duncle of the superior. First pair of gnathopoda having the coxa) 

 extending as far forwards as the anterior margin of the cephalon ; 

 carpus longer than the propodos, slightly dilated; propodos 

 not broader than the carpus, ovate ; palm obHque, not defined ; 

 dactylos short. Second pair of gnathopoda much lai-ger than the 

 fii'st, having the carpus small, inferiorly produced ; propodos large, 

 quadrate, inferior angle produced, so as almost, with the dactjios, 

 to form a chelate organ ; palm concave, serrated ; dactylos long, 

 arcuate, interior and exterior margins parallel. Fiist two pairs of 

 pereiopoda subequal, third scarcely longer than the second, foitrth 



