SEA-FISHERIES LABORATORY. 287 



lus " form in the cercaria stages. The larva referred to 

 here is probably B. haimeanus of Lacaze-Duthiers, a 

 cercaria stage occurring in street, edulis and in Cardium 

 rusticum* 



Cercaria fissicauda, La Val. 



(From Cardium edule.) 

 A cercaria larva with furcate tail was found by Mr. 

 Scott in dissecting some specimens of Cardium edide from 

 Grange-over-Sands. The larva is most probably identical 

 with the species described by the above name, which has 

 hitherto only been recorded from the marine Lamelli- 

 branch Scrobicularia. Mr. Scott's drawing is reproduced 

 in PI. III. fig. 13. 



Cestoda. 

 Dibothrium {—Bothriocephalus) punctatum, Rudolphi (Text- 

 fig. 6). 

 Turbot in the Irish Sea are nearly always infested 

 with this tapeworm. While trawling in Luce Bay, on 

 October 19th of this year, one of these fish was caught 

 which measured over 24 inches in length. On dissecting it 



Text-Fig. 6. Head of Dibothrium punctatus. 



the intestine posterior to the pyloric caaca was found to be 

 almost choked up with a twisted mass of worms belonging 

 to this species. These animals were imbedded in a pearly 

 white mass of chyle, and could only be separated from 

 each other with very great difficulty. Their heads were 

 attached to the walls of the pyloric caeca and the adjacent 

 wall of the intestine. 



* Ann. Sci. Nat. Ser. 4, Zool., 1854, pp. 294-302, PL 6. 



