Volume /.] June, i88y. \_Number i. 



JOURNAL 



MORPHOLOGY. 



SPHYRANURA OSLERI : A CONTRIBUTION TO 

 AMERICAN HELMINTHOLOGY. 



BY R. RAMSAY WRIGHT and A. B. MACALLUM, 

 Professor in | Fellow of 



University College, Toronto. 



Introductory . 



IN 1879 an ectoparasitic Trematode attacking the skin of the 

 interesting Menobranch of our northern lakes {Nectiirus lat- 

 eralis, Raf) was described by the senior author ^ from some 

 specimens mounted in glycerine as microscopic preparations by 

 Prof. W. Osier, now of Philadelphia, who, at the same time, 

 furnished some notes of his observations on the living worm. 

 Although the specimens at the author's disposal were not such 

 as to permit a full account of the form, enough was made out 

 to determine its systematic position and to justify the formation 

 of the new genus Sphyranura for its reception. With this 

 there was associated the specific name Osleri, in compliment to 

 the original discoverer. 



It was then shown that Sphyranura is a form intermediate 

 between Gyrodactylus and Polystomum, an interesting confir- 

 mation being thus furnished of v. Willemoes-Suhm's suggestion ^ 



' R. Ramsay Wright, contributions to American Helminthology. Proceedings of 

 the Canadian Institute, Toronto, 1879. 

 *Zeit. wiss. Zool., XXII., 38. 



