THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY, 



[EIGHTH SERIES.] 

 No. 15. MARCH 1909. 



XXVII. — Notes on Larval Trematodes *. By WiLLlAM 

 NicoLL, M.A., D.Sc, and William Small, M.A., 

 Gatty Marine Laboratory, University of St. Andrews. 



During a short visit to the West of Scotland Mu-ine Bio- 

 logical Station at j\lilIport in August 1908, we had occasion 

 to examine a few of the commoner Crustaceans and Molluscs. 

 One object in doing so was to obtain a general idea of the 

 larval Trematode forms to be met with in the Clyde area, 

 and in particular to investigate the occurrence of cercarise in 

 the common edible and green crabs. The time at our dis- 

 posal was not sufficient to permit of much material being 

 examined, so that the number of larval forms to be described 

 is small, but in the case of the crabs our efforts were more 

 successful. 



In addition to Cancer pagurus and Carcimis mmnas, a few 

 specimens were examined of each of Eupagurus bemhardus, 

 Portunus depurator, Crangon vulgari.f, BaJanus halanoides^ 

 Venus cassina, Myiilus edulis^ Aporrhais pes-pelecani, Patella 

 vulgata, and Lima hians. Only the last-mentioned harboured 

 cercarite. A few young fish, e. g. plaice, dabs, and bullheads, 

 were also examined and in two of these encysted cercarice 

 were found. 



* [This work has in part been done with the aid of a Government 

 Scientific Research Grant. — W. N.] 



Ann. (& 3Iag. N. Hist. Ser. 8. Vol. in. 17 



