28 TREiNtATODES OF THE NORTHUxMBERLAND COAST 



Trejiiatodes of the Northcmberland Coast, No. II. By 

 Marie V, Lebour, M.Sc, Armstrong College, New- 

 castle-upon-Tyne. 



(Plates I.-III.) 



Further research among the marine MoUusca and Crustacea 

 of Northumberland has produced several new larval Trema- 

 todes. Six were already described from Paludestrina sfagnalis*; 

 to these I now add a seventh. This, however, by no means 

 completes the list of those Trematodes which have their home 

 in this small mollusk, for at least three more have been seen ; 

 but owing to their bad preservation I am unable yet to 

 describe them. 



The species referred to above belongs to the genus 

 Gymnophallus, Odhner. Another cercaria belonging to this 

 genus was found in the little bivalve Macoma balthka, and a 

 third in Tdlina tenuis. The last has been recorded before by 

 mef, but, following Giardi, I referred it to Brachyccelhim. In 

 a later paper Giard§ shows that it belongs to Gymnophallus, 

 and it certainly possesses all the characteristics of the larval 

 forms of that genus. 



Another cercaria previously described by Villot||, and 

 recently by Pelseneer**, has been found in Scrobiailaria temiis. 

 Besides those from Mollusca, several larval Trematodes 

 have been detected in Crustacea. All so far observed in 

 Crustacea belong to the genus Spelotrema, Jagerskiold, and 



* " Larval Trematodes of the Northumberland Coast," by the writer. Trans. 

 Nat. Hist. Soc. Northbd., etc., N.S., Vol. I., p. 437, 1907. 



t "Notes on Northumbrian Trematodes," Northbd. Fish. Rep. for 1905, p. 7. 



% Giard, A. "Siu- un Distome {Brachicoelium sp.) parasite des Pel^cypodes," 

 Comptes rendus des s&noes de la Societe de Biologie, 1897, p. 956. 



§ Qiard, A. " Sur 1-es Trdmatodes margaritigenes du Pas de Calais," Comptes 

 rendus des se'ances de la Socie'te' de Biologie, T. LXIII., p. 416, 1907. 



II Yillot, " Organisation et Developpement de quelques especes de Trematodes 

 endoparasites marins," Ann. des. Sci. Nat., Zool., 6 Ser., T. VIII., 1879, p. 18. 



** Pelseneer, P., " Trematodes parasites de Mollusques marins," Bulletin 

 scicntiiiqiie de la France ct dc la Bclgiquo, T. XI., p. 173. 



