316 
GAMMARTTLE. 
Gammarus pulex minutus. Gervais, Ann. Sci. Nat. 2 ser. iy. p. 128. 
Gammarus longicaudatus. Costa, Recherche sui Crost. Amf. Napoli, in 
Mem. d. Reale Accad. Scienz. Napol. vol. i. 
tav. iy. 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, and 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. 
