316 GAMMARTTXE. 



Gammarus pulex mlnutm. GERVATS, Ann. Sci. Nat. 2 ser, iv. p. 128. 

 Gammarus lonyicaudatus. COSTA, Recherche sui Crost. Amf. Napoli, in 



Mem. d. Reale Accad. Scienz. Napol. vol. i. 



tav. iv. fig. 6. 

 Gammarus subterraneus. LEACH, Edin. Encyc. vii. p. 403. 



THE body of the animal is long and very narrow. 

 The postero-inferior angles of the three anterior seg- 

 ments of the tail are rounded, arid furnished with three 

 or four equidistant hairs. The superior antennae are not 

 half the length of the animal ; the flagellum being twice 

 as long as the peduncle. The inferior antennae are more 

 than half the length of the superior ; the peduncle 

 being longer than the peduncle of the superior. The 

 coxae of the legs are about half the depth of the re- 

 spective segments of the body. The first two pairs of 

 legs are very small, and of the same size and form ; 

 the wrists are infero-anteriorly hollow, to receive the 

 posterior margin of the hands ; the hands are of a 

 triangular form, the three sides being nearly of equal 

 length, the angles being rounded off, the upper edge 

 slightly, and the lower edge considerably rounded, the 

 palm is defined by a strong spine, a few hairs also 

 fringe both the palm and the inferior margin. In a 

 specimen captured at Leyden, by Prof. Westwood,* those 

 upon the inferior margin form about seven distinct fas- 

 ciculi, whilst those on the palm are very regularly 

 equidistant, and more numerous than are represented 

 in our figure, drawn from one of the dried Maidenhead 

 specimens, presented by Prof. Westwood to the British 

 Museum. The fingers are robust, and furnished with a 

 distinct nail. The walking legs bear a normal resemblance 

 to those of the typical genera of the order, but in detail 



* I am not quite satisfied of the identity of the Leyden and Maidenhead 

 specimens. I. 0. W. 



