358 
Echinostomum secundum, Nicoll 
REFERENCES. 
Lebour, M. V. (1904). Preliminary Note on a Trematode Parasite in Cardiuin 
edule. Northumberland Fisheries Report for 1904. See also Report for 1905. 
Lebour, M. V. (1906). The Mussel Beds of Northumberland. Northumberland 
Fishenes Report for 1906. 
Lebour, M. V. (1907). Larval Trematodes of the Northumberland Coast. Trans. 
Nat. Hist. Soc. of Northumberland etc., Yol. I, n.s. p. 447. 
Nicoll, W. (1906 a). Notes on trematode parasites of the Cockle [Cardiurn 
edule ) and Mussel ( Mytilus edulis). Ann. and Magaz. of Nat. Hist., ser. 7, 
Vol. xvii. 
Nicoll, W. (1906 b). Some new and little known Trematodes. Ibid. p. 513. 
EXPLANATION OF PLATE XXIV. 
Fig. 1. Young redia of Echinostomum secundum. 
Fig. 2. Full grown redia containing Cercarise. 
Fig. 3. Front of head of Cercaria. (S — ducts of glands, E = excretory duct. The head 
spines are omitted for clearness.) 
