86 RESEARCHES IN HELMINTHOLOGY AND PARASITOLOGY. 



Mouth infero-terminal, acetabiiliform, transversely oval. Penis 

 conical, protruding a short distance below the mouth. Female 

 aperture a short distance below the penis. Length r to i )4 lines, 

 breadth )4 to 3^ths of a line, thickness j^th to )^ a line. 



A dozen specimens were obtained from the abdominal cavity of 

 Rana pipicns. 



17. MoHostonium Refiicapitc, Leidy. Body depressed , lateral mar- 

 gins parallel, anteriorly and posteriorly rounded, above convex, 

 below concave. Head formed by a transverse, reniform callosity. 

 Mouth transversely crescenic, surrounded with a double lip. Penis 

 a small conical tubercle. Length from yC an inch to i inch, breadth 

 1% lines. 



Numerous specimens were obtained by Prof. Agassiz from the 

 intestine of Sphargiis coriacea. 



18. f Monostomum ;I/<?//^, Leidy. Body depressed, elongated ellip- 

 tical, posteriorly convex. Head ? Mouth ? Length 9 lines, breadth 

 2 lines. 



I have found two specimens of what I suspect to be a species of 

 Monostonmm in the lungs of two individuals of Stcrnothejus odoratus. 

 The species is so soft that in the removal of the specimens I muti- 

 lated both, and since then I have been unable to find others. 



ig. DistoviJim Lanceolahim , Mehlis. Reported to exist in the 

 sheep, Capra aries ; the ox. Bos taiirics ; the hog, Susscrofa. Stated 

 to be frequent in the sheep in several of the Western States. 



20. Distomum Hcpaticiun . In the hepatic ducts of the Cervus 

 virginiamis. Though I have never seen specimens from the source 

 given, yet I think there is little doubt of its existence, from the 

 circumstance that sportsmen and hunters have frequently informed 

 me they had seen leeches in the liver of the deer, which they sup- 

 posed the animal had swallowed in drinking. Also reported to exist 

 in the ox, Bos taurus, and in the horse, Equiis cabal/ ks. 



21. Disfonnon l^ariabile,l^Q\dy. Var. «. Bod}^ white, variegated 

 with black in the course of the oviduct, clavate, po.steriorly obtuse, 

 minutely echinated. Neck long, narrow, cylindrical, echinated. 

 Oral and ventral acetabula nearly equal ; the latter one prominent, 

 situated at the base of the neck. Length to 6 lines ; breadth of 

 body y2 line. 



Var. b. Body flattened ovate, continuous with the head ante- 

 riorly narrowed, po.steriorly obtuse, color and echination as in the 

 preceding variety. Length 2^ lines, breadth 2 lines. 



Variety a is found attached to the sides of the cavit}' of the lungs 

 of Tropido7iotus sipedon , singly or in groups up to six, with the head 



