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. Spined 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 

 marine plants and zoophytes. 



To the genus Dexamine belongs the Cancer carino-sju- 

 nosus, Turton, which Mr. Spence Bate has more fully de- 

 scribed under the name Gammarus Moggridgei (Ann. and 

 Mag. Nat. Hist. N. S. vol. vii. p. 318, t. 10, fig. 10). 



The Eev. 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, Falmouth, 

 Moray, and Macduff. 



Dexamine Gordoniana. — Eleventh segment furnished 

 with a spine. 



