204 THE ROYAL SOCIETY OF CANADA 



(20) Osborn, H. L.; Bunodera cornuta, sp. nov.: A new Parasite from the Crayfish 



and certain fishes of Lake Chautauqua, N.Y., in: Biol. Bull., Vol. V, 



1903, pp. 63-73. 



(21) ; On the Structure of Cryptogonimus chyli, an aberrant Distome, 



from Fishes of Michigan and New York, in: Journ. Exp. Zool., Vol. 9, 

 1910, pp. 517-36. 



(22) Pratt, H. S.; A Contribution to the Life-History and Anatomy of the Ap- 



pendiculate Distomes, in: Zool. Jahrh., Bd. 11, Anat., 1898, pp. 351-88. 



(23) ; Synopses of North American Invertebrates, XII, The Trematodes, 



Pt. 1, in: American Naturalist, Vol. XXXIV, 1900, pp. 645-62. 



(24) ; Ibid., Pt. II, in: Ihid., Vol. XXXVI, 1902, pp. 887-910. 



(25) Stafford, J.; Some New and Undescribed Trematodes, in: Zool, Jahrb., Bd. 13, 



Syst., 1900, pp. 399-414 



(26) — ; Trematodes from Canadian Fishes, in: Zool. Anz., Bd. XXVII, 



1904, pp. 481-95. 



(27) Wedl, C; Anatomische Beobachtungen ueber Trematoden, in: Sitzbr. d. K. 



AM. Wiss., Math.-Naturw. Classe, Wien, Bd. 26, 1857, pp. 241-78. 

 (28)^Wegener, G.; Die Ektoparasiten der Fische Ostpreussens, Aus dem Zool. Mus. 



d. Univ. z. Konigsherg i. Pr., Inaug. Diss., 1910. 



(29) Wilhelmi, J.; Fauna u. Flora des Golfes von Neapel, Tricladen, Bd. 32, 1909. 



(30) Willey, A.: Notes on the Plankton collected across the mouth of the St. 



Croix River opposite to the Biological Station at St. Andrews, New Bruns- 

 wick, in July and August, 1912, in: Proc. Zool. Soc. London, June 1913, 

 pp. 283-292. 



Explanation of Figures. 



All figures were drawn with the assistance of an Abbé camera-lucida from 

 transparent preparations in oil of cedar-wood. 



ac, acetabulum. pd, posterior disc. 



as, anterior sucker. ph, pharynx. 



cyd, common yolk duct. ps, penis-sac. 



e, eyes. ri, right intestinal coecum. 

 exv, excretory vesicle. ryd, right yolk duct. 



ga, genital atrium. sba, sucker-bearing appendage. 



gp, gonopore. ts, testes. 



ic, intestinal coecum. ut, uterus. 



lyd, left yolk duct. vd, vas deferens. 



m, mouth. vg, vitelline glands. 



oes, oesophagus. vo, vaginal opening. 



ov, ovary. yr, yolk reservoir. 



