^40 AMPUIPODA NOUMALIA. 



prn]MKlos as long as the (•aiims, but slighter and anteriorly ser- 

 rated ; dactylos short, acute : fifth pair of pereipoda not reaching 

 to the extremity of the meros of the preceding pair, very slender, 

 rudimentary ; bases not dilated. Ultimate pair of pleopoda having 

 the peduncle short, scarcely as long as broad ; rami half as long 

 again as the peduncle, margins distally serrate : penultimate pair 

 scarcely reaching beyond the distal extremity of the peduncle of 

 the ultimate : antepenultimate reacliing almost to the extremity 

 of the ultimate, having the margins of the rami slightly serrated. 

 Telson obsolete. 

 Length if^yths of an inch. 



Hah. Indian Ocean {M. Baynaud). 



The specimen from which the description and figure are taken 

 belongs to those entrusted to me by the authorities of the Jardin des 

 Plantes. I am incKned to believe that it is the type from which 

 Milne-Edwai'ds described this genus, since it is labelled "■ Ocean 

 Ind., M. Raynaud, Cap Fabre, Janvier 1829," &c., and I saw no 

 other specimen in the Museum. 



2. Phorcus hyalocephalus. (Plate LIU. fig. 10.) 

 Phorcus hyalocephalus, Dana, U. S. Explor. Exped. p. 1006. pi. 69. f. 2. 

 " Cephalon with the front rounded, and the anterior surface directed 

 "obliquely downwards and outwards. Fii-st and second segments 

 of pereion nearly concealed. First and second pairs of pereiopoda 

 equal, slender : tliird pair nearly as long as the body ; last joint 

 longest, acute ; carpus shorter than meros : fourth pair long, but 

 shorter than the third ; bases large and nearly elliptical ; ischium 

 small ; meros large, subelliptical, with the outer extremity deeply 

 excavate (for articulation with the next joint), posterior apex 

 acute, anterior obtuse ; propodos a little longer than carpus, inner 

 margin minutely serrulate ; dactylos short : fifth pair slender ; 

 basos much shorter than the following part. 

 " Length 2 lines. 



" Hah: Atlantic, in latitude 1° S., longitude 18° 20' W. CoUected 

 November 5, 1838."— DrtJia. 



