LERNEOCERA. 843 



belonging to this genus. In his 'Fauna Suecica,' 1746, 

 he describes a species found in Sweden on the carp ; a 

 species which Barbut, in 1783, ascertained to be British. 

 Hermann also, in 1783, describes and figures another 

 species, and several have since that time been added to 

 the list. 



Blainville, in his Monograph, so often quoted, formed 

 the genus Lerneocera to receive several species which had 

 then been described, and amongst others the species found 

 by M. Surriray, of Havre, which led to the first notice of 

 the young of the Lerneadse. 



The genus, as established by Blainville, contains two 

 species, which have been separated from it by Kroyer and 

 M. Edwards; but still it has been retained in a restricted 

 sense by all succeeding authors. 



LERNEOCERA CYPRINACEA. Tab. XXXV, fig. 13. 



LERNJSA CYPRINACEA, LiniKeus, Faun. Suec., No. 2100, t. 2, f. 2100 ; 



Syst. Nat., edit. 12th. 

 Barbut, Geu. Vermium, t. 7, f. 3. 

 Titrton, Brit. Faun., 137, No. 105. 

 Lamarck, An. s. Vert., iii, 230; Euc. im'th., 



Vers, t. 78, f. fl. 



LERNEOCERA CYPRINACEA, Blainville, Journ. de Phys., xcv, 377. 



Desmarcst, Cons. gen. Crust., 346. 

 Burmeister, Nov. Act. Nat. Cur., xvii, 



309,1 HA, f. 1-3. 

 M. Edwards, Hist. Nat. Crust., iii, 527. 



Head furnished with four horn-shaped appendages, 

 which are somewhat long and slender. The two outer or 

 posterior are bifurcated ; the anterior simple. 



The thorax is very slender anteriorly, forming a long 

 neck, but becomes much broader posteriorly, and when it 

 terminates in the small abdomen, appears obliquely trun- 

 cate. The oviferous tubes are cylindrical, and rather long. 

 The length of the whole animal is about eight lines. 



Hab. -" Found on the sides of the carp, bream, and 



