1-1)6 BRITISH PARASITIC COPEPODA. 



different from the Carp family ; and his figures of the para- 

 sites of this fish, while in general agreement with that of 

 Dr. Baird, represent what appears to us to be a different 

 species from the one figured by the English author. Nord- 

 mann's figures show a more robust animal, with shorter and 

 thicker cephalic horns, the distal extremity is also more 

 decidedly deflexed, and the ovisacs are short and saccate.* 

 Probably this is the Lernseocera esocina of Hermann and not 

 L. cyprinacea (Linn.). We prefer therefore to retain mean- 

 while Linne's species name, cyprinacea, for the Lernseocera 

 recorded by Dr. Baird. 



Genus 32, LERNJEENICUS Lesueur, 1824. 



Body elongated, slender, obscurely or non-seg- 

 mented. Head somewhat expanded, sometimes pro- 

 duced into a cone-like process in front, and usually 

 provided with two or three stiff cartilaginous horns, 

 projecting outwards or more or less obliquely back- 

 wards. Thorax very narrow, forming a kind of neck, 

 and merging posteriorly into the somewhat stouter 

 abdomen. Abdomen without penniform appendages. 

 Antennules small, obscurely Inarticulate, and more or 

 less setiferous. Antennae small but strongly chelate, 

 and similar to those of I'l'inu'lla. Thoracic legs very 

 small, and situated immediately behind the head, each 

 pair slightly apart from the other ; the first and 

 second pairs biramous and the others uuiramous, and 

 all the rami two-jointed. Egg-strings long and slender. 



1. Lernaeenicus sprattae (Sowerby). 

 (Plate XL VI, figs. 1-5.) 



1806. Lerntfa spratta Sowerby. Brit. Miscellany, vol. ii, p. 17, 

 pi. Ixviii. 



1840. Lertwonema monilaris M. Edwards. (43) p. 525, pi. xli, fig. 5. 



1850. Lerneonema spratta Baird. (4) p. 341, pi. xxxv, fig. 10. 



1850. Lernwonema bairdi Salter. (106) (ser. 2), vol. vi, p. 86, pi. vii, 

 fip. 1. 



1865. Lernu'onema monilaris Heller. (58) p. 248, pi. xxv, fig. 4. 



1868. Lermeenicus stpratta Olsson. (92) p. 46. 



" This figure of Nordmann's is reproduced on PI. L, fig. 1. If com- 

 pared with Dr. Baird's figures of L. cyprinacea on the same plate (fig. 4), 

 the difference referred to will be readily observed. See also Selago's figure, 

 which resembles Haird's and is also reprodiiced on this plate (fig. 5). 



