GENEEA UROTHOE AND IJROTHOIDES. 13 



tapering as in Urothoe brevicornis, but narrowing rather abruptly as in Urothoe marinus, 

 from which, however, it differs in having on the front margin many little sharp denticles 

 rather closely set, even that nearest the tip being of no great size, nor does the tapering 

 part form a concave margin as in the last-named species. 



Fourth per'ceo2:)ods nearly as in Urothoe brevicornis, the third joint not shorter than 

 the fourth, the fourth with four or five groups of spines on the front and two on the 

 hind margin ; the finger more than half the length of the fifth joint, very narrowly 

 tapering, with numerous little teeth or tubercles along the front margin. 



F-ifth percBopods nearly as in Urothoe marinus, but the side-plates less crenate, the 

 first joint scarcely at all more widened above than below, the fourth joint with four or 

 five groups of spines on the front and two on the hind margin, the slender tapering 

 finger more than half the length of the fifth joint, with from twenty to thirty little 

 tubercles along its front margin ; the first joint in the female having the front margin 

 slightly more convex than in the male. 



Pleopods nearly as in Urothoe marinus, but none of the peduncles elongate, and the 

 joints of the inner ramus not exceeding thirteen, those of the outer not exceeding 

 nineteen in number. 



Uropods nearly as in Urothoe marinus, but outer branch of first pair with only two 

 spines, branches of second pair without armature, the branches of the third pair with 

 fewer setge, and the inner branch only reaching the base of the second joint of the 



outer. 



Telson short, with very convex sides, otherwise nearly as in Urothoe brevicornis. 



Length about a fifth of an inch. 



Localities. Naples (specimens obtained by Canon Norman) and off the west coast of 

 France (specimens obtained by M. E. Chevreux). 



Urothoe elegans, Sp. Bate. (Plate I.) 



1856. Gammarus elegans, Sp. Bate, On the British Edriophthalma, Brit. Assoc. Report for 1855. 



1857. Urothoe elegans, Sp. Bate, Synopsis of Brit. Edr. Crust., Ann. & Mag. Nat. Hist. ser. 2, 



vol. xix. p. 145. 

 1857. ,, „ White, Popular History of British Crustacea, p. 186. 



.1863. „ „ Sp. Bate, Brit. Mus. Catal. Amph. Crust, p. 117, pi. xx. fig. 3. 



1863. „ „ Bate & Westwood, British Sess. Crust, vol. i. p. 300, woodcut. 



1869. „ „ Norman, Last Report on Dredging among the Shetland Isles, Brit. Assoc. 



Report for 1868, p. 379. 

 1876. „ „ Giard, Comptes Rendus, Jan. 3, p. 76; Ann. & Mag. Nat. Hist. ser. 4, 



vol. xvii. p. 361. 

 1876. „ „ Stebbing, Ann. & Mag. Nat. Hist. ser. 4, vol. xvii. p. 344. 



1879. „ „ Sp. Bate, The Crustacea in Couch's Cornish Fauna revised and added to 



Journ. Roy. Inst. Cornwall, no. xix. pt. ii. p. 48 (sep. copy). 



