PARASITIC WORMS BERMUDA. I. TREMATODES. 229 



in M. pandum is incorrect and " they are as a matter of fact made up 

 of successive pairs of distinct organs," then the trematode which I 

 have described may be identical with Monostommn jmiidum. iVlso, 

 if Pratt is in error regarding " the sHghtest indication of the coUar-Hke 

 cephalic ridge at the forward end of the body" being absent in Wildcria 

 elliptica, his species is probably identical with the trematode which I 

 have described and with Monostomum pandum. Until these points 

 are determined, it seems advisable to create a new genus and a new 

 species for this trematode, which I accordingly designate as Syne- 

 chorchis mecjas, making it the type species of a new genus, Synechorchis} 

 designed to include those monostome trematodes which have a con- 

 tinuous cephalic collar, and numerous testes placed laterally in the 

 posterior part of the body. 



The material, on which these descriptions are based, was collected 

 and sent to me by Prof. E. L. Mark, Director, and Dr. W. J. Crozier, 

 Resident Naturalist, of the Bermuda Biological Station. To both of 

 them I wish to acknowledge my appreciation and indebtedness.' 



To Mr. Hiram O. Studley, one of my students, I desire to express 

 my appreciation for his assistance in making a preliminary study and 

 drawings of the second form described in this paper. 



^ "Zwexn^, continuous line, and opxi-^, testicle. 



