250 
GAMMARID.E. 
A MPIIIPODA . 
NATATOETA. 
GA MM A RIDES . 
ATYLUS BISPINOSUS. 
Specific character. First and second segments of the pleon posteriorly pro- 
duced into two strong dorsal teeth. Latero-posterior margin of the third 
segment ornately waved and serrated. 
Length | inch. 
Dexamine bispinosus. Spence Bate, Ann. Nat. Hist. 2 ser. xix. p. 142, 1857. 
White, Pop. Hist. Brit. Crust, p. 178. 
Atylus bispinosus. Spence Bate, Cat. Amph. p. 140, pi. xxvii. fig. 1. 
The liead is anteriorly produced, between the superior 
pair of antennae, into a small rostrum. The first two 
segments of the tail have the postero-dorsal margins pro- 
duced into two strong teeth ; the third segment of the 
tail has the posterior margin considerably waved on each 
side : commencing from the middle of the back, it is 
first concave, then produced on each side into a small 
lobe ; it is again deeply sinuated, the lower edge of the 
sinus produced in the form of a strong recurved tooth, 
below which it is indented, the margin being closely ser- 
rated to the inferior angle, which terminates in a sharp 
tooth. 
