GAMMARID.'E. 189 



forior and supcnor margins parallel, and fringed with fasciculi of 

 hairs ; palm oblique, ii-rcgularly notched, defined by a small sharp 

 denticle ; dactylos arcuate, outer margin fnnged with e([uidistant 

 hairs, Pcreiopoda sube(]ual, having the dactyla distinctly ungui- 

 culate ; three posterior pairs having the basa long-ovate, posterior 

 margins serrated. Posterior pleopoda not extending beyond the 

 two preceding. The animal when alive is very transparent ; its 

 coloui" is a pale straw tinted with rose. 

 Length rnyths of an inch. 



Hah. Devonshire (Moufac/u). A large number were found on some 

 sunken rope that was brought up fi-ora Plymouth Sound by my friend 

 Mr. T. P. Smyth, where I have also dredged it. It has likewise 

 been taken at the following places : Polperro (Mr. Louglirin) ; Pen- 

 zance {Mr. Harris) ; Yendec (M.-Edwards). 



2. Mcera tmncatipes. (Plate XXXIV, fig. 4.) B.M, 



Amphitoe ti'uncatipes, Spinohi, 3IS. li. 31. 

 White, Cat. of Crust, in B. 31. 1847. 



Eyes small, 'round. Superior antennae about half the length of the 

 animal. Inferior antennae scarcely longer than the peduncle of 

 the siiperior. First pair of gnathopoda having the carpus longer 

 than the propodos ; propodos ovate, palm convex, slightly obhquc, 

 defined by a small tooth, and armed with short ciha. Second pair 

 of gnathopoda having the carpus short, and the propodos very 

 large, equaUing in length the cephalon and first two segments of the 

 pereion, ovate ; palm convex, defined by a large tooth, and cleft into 

 two divisions by a deep central emargination, the superior di^-ision 

 being armed with three obtuse spines subapically tipped with a 

 single cihum, the inferior division with three solitary cilia and a 

 single fasciculus of hairs ; dactylos as long as the pahn, having a 

 protuberance corresponding A\ith the emargination in the pahn, 

 Basa of the three posterior pairs of pereiopoda posteriorly crenulate. 

 Posterior pair of pleopoda having the rami not longer than the 

 peduncle, obtuse, and tipped with stout hairs. TeLson having each 

 di\-ision ovate mth an emarginate apex, from the centre of which 

 springs a long hair and a short cilium. 



Length ^ths of an inch. 



Hah. Italy (Marquis of Spinola, by whom the specimen was pre- 

 sented to the British Museum). 



This species may be Gummarus crassimamis of Viviani, 'Phosphor. 

 Maris,' &c. p. 10. t. 2. figs. 7 & S; but not having seen tliat work, 

 I hesitate to do more than suggest the possibilitj. 



