158 BRITISH PARASITIC COPEPODA. 



2. Lernseenicus encrasicola (Turton). 

 (Plate XL VI, figs. 6-9.) 



1807. Lernsea encrasicola Turton. (141) vol. i, p. 137, No. 108. 

 1850. Lerneonema encrasicola Baird. (4) p. 341, pi. xxxv, fig. 11. 

 1868. Lernseenicus encrasicola Olsson. (92) p. 46. 

 1877. Lernseenicus encrasicola Richiardi. (102) vol. iii. fasc. i. 

 1907. Lernseenicus encrasicola A. Scott. (Ill) p. 93, pi. ii, figs. 6-9. 



Female. — Closely resembling Lernseenicus sprattse, 

 and may be easily mistaken for it. Among the more 

 obvious points of difference are the following : — (1) 

 The horn-shaped appendages of the cephalon, instead 

 of pointing obliquely backwards, stand out at nearly 

 right angles with the median line of the body. (2) 

 " The neck is long and slender, quite smooth and 

 destitute of the constrictions which mark so decidedly 

 the preceding species" (Baird). (3) It is usually 

 found attached to the body of its host, the head some- 

 times penetrating into the abdominal cavity. 



The appendages of the cephalon and thorax do not 

 appear to differ greatly from those of Lernseenicus 

 sprattse. Length about 27 mm. 



No males of either species have been observed. 



Habitat. — Parasitic on the anchovy, Engraulis 

 encrasicholus, and sprat, Glupea spratta. On a sprat 

 captured at Youghal (B. Ball, W. Thompson). " Found 

 attached to the bodies of Glupea encrasicholus and 

 sprattus frequently, in Swansea Bay" (W. Turton). 

 Attached to the body of a sprat (J. Boubleday, 

 British Museum).* A broken specimen, probably 

 belonging to this species, was taken from a Glupea 

 alosa at Plymouth (Bassett-Smith) . On the eye of a 

 young pollack at Falmouth (Codes; cf. 'Crust, of Devon 

 and Cornwall' by Norman and Scott, p. 216, 1906). 



" A large catch of sprats was taken off Blackpool on 19th 

 February 1906 by the Lancashire Fisheries Steamer, and 

 a few hundreds of them were landed at Piel. A careful 

 examination of these was made, and one sprat with two of 

 the above mentioned parasites attached to it and another 

 with one were found. The parasites were embedded in the 

 * These records are from ' British Entomostvaca/ p. 342 (1850). 



