On Cephalogonimus vesicaudus n. sp. 255 



lipon tlie presence of a caiidal vesicle and the lack of an esophagus. 

 In view however of the close resemblance of the three forms 

 in all other respects it has seemed to me not necessary to separate 

 them and I have preferred to refer my species to Poirier's 

 genus. 



Minneapolis, Minn., Aug-. 15, 1911. 



Literatiire. 



LOOSS, A., 1899, Weitere Beiträge zur Kenntniss der Trematoden-Fauna 



Aegyptens etc., in: Zool. Jahrb., Vol. 12, Syst., p. 521. 

 Peatt, H. S., 1898, A contribution to the life-history and anatomy 



of the Appendiculate Distomes, ibid, 11, Anat. 

 — , 1902, Synopses of N. American Invertebrates XII. The Trematodes, 



in: Amer. Naturalist, Vol. 36, p. Ü59. 

 PoiElER, J., 1886, Trematodes nouveaux ou peu connus, in: Bull. Soc. 



pbilom. Paris, Vol. 10. 

 Staffoed, Jos., 1902, Cephalogonimus americanus n. sp., in: Ctrbl, 



BakterioL, Vol. 32, p. 719. 



18* 



