GAMMARID-E. I 1 1 



1. Guerinia Nicaeensis. (Plate XIV. a. fig. 5.) 

 Quorinia Nica?eusis, Jlajw, Fauna of Naples (three new Cnistacca). 

 Cephalon produced to a point. E^'cs large, oceupj-ing nearly the 

 whole of the cephalon. Superior antennae reaching but little 

 beyond the peduncle of the inferior. Inferior antenna; one-third 

 the length of the animal. First pair of gnathopoda ha^•ing the 

 propodos veiy hirge, quacb-atc ; palm scarcely convex, evenly 

 sen-ated ; daotylos cui'ved, large and powerful. Second pair of 

 gnathopoda feeble, slender, having the propodos very small; 

 dactylos triangular, dilated, compressed, flattened at the apex, 

 and fringed with long hairs, Perciopoda subequal. Three pos- 

 terior pairs of plcopoda subequal, rami iiniform. Telson nearly 

 circular. 



Hah. Taken on fish off" the coast of Naples (Hope). 



For the description of this animal I am dependent upon the 

 accuracy of the llev. Mr. Hope's figiire in the pamphlet quoted. 



27. LEPIDACTYLIS. 



Lcpidactylis, Sat/, Proc. Phil. Acad. vol. i. part 2. 

 Dana, If. iS. Ex2)lor. Exped. p. 912. 



Cephalon subcpiadrate, short, produced into a short aciite rostram. 

 Eyes convex, touching the anterior edge of the cephalon. Antcnnic 

 subequal : superior having the flagellum not longer than the 

 last joint of the peduncle : inferior rather longer than the superior, 

 incurved ; fourth and fifth joints of the peduncle dilated infcriorly, 

 compressed, furnished "v\ith elongated plumose cilia ; these two 

 joints when at rest form a continuous oval ; the former is dola- 

 brifoiTU. Gnathopoda simple, filiform, equal. First and second 

 pairs of pereiopoda equal, didactyle ; liand compressed, not dilated ; 

 finger rounded ; timmh oval, lamcUiform : remaining pereiopoda 

 gradually larger, compressed, armed with short spines, and destitute 

 of a dactylos : posterior pair largest ; meros lengthened above, 

 and nearly attaining the tip of the carpus, which is crenated and 

 spinous on the edge ; propodos compressed, serrated and spinous 

 on the .edge and truncate at tip. Picon abniptly narrower than 

 the percion. 



Few authors have suficrcd more from the want of a uniform system 

 of names in describing Cnistacea than Professor Saj-. This genus lias 

 been passed over bj- authors in consequence of the description not 

 conveying a clear idea of the form. In the foregoing I have been 

 obliged to retain Say's expressions of finger and tliumb. because I 

 cannot with certainty identify their liomulogues. 1 am inclined to 



