some Species of Leptocheirus. 309 



Length 10 mm. 



A single specimen was procured by me in 1880 (July 9), 

 when dredging with my late friends Dr. Jeffreys and the 

 Marquis de Folin in the Fosse de Cap Breton, Bay of Biscay, 

 in 35-60 fathoms. 



The chief characteristics of this species are the long 

 secondary appendage of the antennules, the form and size of 

 the coxa of the first and second gnathopods, the spine-formed 

 process on the side of the first segment of the urosome, and 

 the strongly formed spines of the second uropods. 



Leptocheirus pinguis (Stlmpson). 

 (PL XIII. Hgs. 4-8.) 



1853. Ptilocheirus pinguis, Stimpson, Invert. Grand Manan, p. o6. 

 1862. Protomedeia pinguis, Bate, Cat. Amphip. Crust, p. 170 pi. xxxi. 



fig. 2. 

 1862. Protomedeia fimbriata, Bate, /. c. p. 169, pi. xxxi. fig-. 1. 

 1873. Ptilocheirus pinguis, Verrill, U.S. Comm. Fish and Fisheries, 



p. 561. 

 1893. Leptocheirus pinguis, Delia Valle, Gammarini del Golfo di 



Napoli, p. 432, pi. Ivii. figs. 1-3. 

 1906. Leptocheirus pinguis, Stebbing, Das Tierreich, Amphipoda, 



I. Gammaridea, p. 627. 



The cephalon is about' equal in length to the first two 

 segments of the mesosome; the first and second segments of 

 the urosome have each a spine-point situated on both sides of 

 the centre of the dorsum, and those of the second segment are 

 accompanied by a cluster of siiort stiff setge. The telson is 

 subtriangular, t!ie apex forming a very obtuse angle, the 

 breadth greatly exceeding the length ; near the lateral 

 margins are groups of short stiff setse similar in character to 

 those of the second segment of the urosome ; all the segments 

 of the uro.some are short and closely crowded too^ether. The 

 accessory appendage of the antennules (Pi. XIII. fig. 4) con- 

 sists of six to eight joints, and equals in length the first three 

 joints of the flagellum. The coxte (or epimera) of fhegnatho- 

 pods and following pera3opods have their hinder margin beset 

 with well-developed spines (see figures) : that of the first 

 gnathopodis small, linguiform, narrowed, rounded at the extre- 

 mity ; that of the second gnathopod is very large, its length 

 not much exceeding its breadth. The first gnathopod (fig. 5) 

 has the propodos subequal in length to the carpus and slightly 

 widening from tiie base to the extremity, where the palm is 

 directly transverse; the finger is finely denticulated and 

 .exactly fits the slightly convex shape and the length of the 

 palm. In the second gnathopods (fig. 6) the basal joint has 

 a length equal to the following joints to the middle of the 



