Vol. V. July, I 93- No. 2 



BIOLOGICAL BULLETIN. 



BUNODERA CORNUTA SP. NOV. : A NEW PARASITE 



FROM THE CRAYFISH AND CERTAIN FISHES 



OF LAKE CHAUTAUQUA, N. Y. 



HENRY LESLIE OSBORN. 



\ 



A trematode is met frequently at Chautauqua, New York, 

 which though already known seems never to have been critically 

 studied and described. While generically identical with B. nodu- 

 losa Zeder, of. Europe, it cannot be referred to the same species. 

 A form mentioned by Kellicott, '83, and Wright, '84, and Lin- 

 ton, '92, may be identical with it. I have not yet had access to 

 the articles of the first two writers, but Linton, '92, regards the 

 form they mention as identical with the one which he describes 

 from cysts from the ovary of crayfish from Alma, Michigan, 

 which, while it is much like B. nodulosa of Europe, he regards 

 as distinct, on account of the two lateral papillary appendages 

 projecting from the oral sucker and of triangular shape. Ward, 

 '94, reports at Ann Arbor, Mich., the form mentioned by Kelli- 

 cott, Wright and Linton, and considers it probably identical 

 with B. nodulosa of Europe. I am at present inclined to think 

 that of these four cases at least that of Linton is identical with 

 the Chautauqua form, and that the others may be. My knowl- 

 edge of B. nodulosa is almost entirely drawn from the account 

 of it in Looss' ('94) admirable monograph of the fish and frog 

 distomes, as I have not had access to specimens of that form. 

 A related trematode is described and figured by Linton, '98, from 

 the intestine of the lake sturgeon, and referred to B. auriculata 

 of Wedl, '57. A single specimen of the material on which Lin- 

 ton's account was based has been loaned me by the U. S. 

 National Museum through the kindness of Dr. C. W. Stiles, 

 and from such examination of it as I could make without injur- 

 ing it I was able to see that externally it is essentially like B. 



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