178 
HISTORY OF BRITISH CRUSTACEA. 
first joint shorter than the second. Eyes oblong, not pro- 
minent, inserted behind the upper antennae. Tail on each 
side with three double styles, and furnished above on each 
side with a movable style. 
Dexamine spinosa. Seined Sea Screw. (Plate X. 
fig. 7.) — When alive of a deep red-brown, and highly 
glossy ; the four hind plates of the abdomen are keeled, 
and produced into a spine ; head with a short beak ; upper 
antenna with the second joint longer than the first. 
Coast of Devon, and elsewhere, dragged on shore amongst I 
marine plants and zoophytes. 
To the genus Dexamine belongs the Cancer carino-spU 
nosus , Turton, which Mr. Spence Bate has more fully de- 
scribed under the name Gammarus Moggridgei (Ann. and i 
Mag. Nat. Hist. N. S. vol. vii. p. 318, t. 10, fig. 10). 
The Bev. A. Norman has found it at Clevedon, Somerset. 
Dexamine bispinosa, Spence Bate. — Second segment of 
upper antennae not so long as the first ; eighth and ninth 
segments only produced into a spine. 
Plymouth (Mr. Spence Bate) ; Penzance, Palmouth, 
Moray, and Macduff. 
Dexamine Gordoniana.— Eleventh segment furnished 
with a spine. 
