44 [February, 



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 supposed the animal 

 had swallowed in drinking. Also reported to exist in the ox, Bos taurus, and in 

 the horse, Equus caballus. 



21. DiSTOMUM VARiABiLE Lcidy. Var. a. Body white, variegated with black in 

 the course of the oviduct, clavate, posteriorly 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 J a line. 



Var. b. Body flattened ovate, continuous with the head, anteriorly narrowed, 

 posteriorly 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 cavity of the lungs of Tro- 

 pidonotus sipedon, singly or in groups up to six, with the head and neck buried 

 in tumors, as in the case of the attachment of Echinorhynchi. Variety b is found 

 detached in the mucus of the lungs and trachea. Common ; obtained in De- 

 cember, when the water snakes were hybernating. 



22. DiSTOMUM HORRiDUM Leidy. 



Distoma horridum Leidy, Journ. A. N. S., 2d ser., i, 303. 

 From the excretory duct of the kidneys of the Boa constrictor. 



23. DiSTOMUM VARIEGATUM Rud. 



Leidy, Pr. A. N. S., v, 207. 

 From the lungs of Rana pipiens. 



24. DiSTOMUM RETUSUM Dug. 



Leidy, Pr. A. N. S., v, 207. 



From the intestine of Rana halecina. 



25. DiSTOMUM CYGNOiDES Zcdcr. 

 Leidy, Pr. A. N. S., v, 207. 



From the urinary bladder of Rana pipiens, R. palustris, R. halecina; Salaman- 

 dra maculata, S. rubra, S. salmonea. 



26. DiSTOMUM LONGUM Lcidy. 

 Pr. A. N. S., V, 206. 



From the mouth of Esoz estor. 



21. DiSTOMUM TERRETICOLLE Rud. 



Leidy, Pr. A. N. S., v, 206. 



From the stomach of Esox reticulatus. 



28. DiSTOMUM iNCiviLE Leidy. Body flat, elongated elliptical ; echinated be- 

 tween the oral and ventral acetabula, which are equal, and the latter one is 

 hemispherical and sessile. Length 2 J to 3 lines, breadth 3-5ths to 4-5ths of a 

 line. 



Obtained from the intestine of Leiostomus oUiquus. 



29. DiSTOMUM CLAVATUM ? Rud. Body pyriform, transversely annulated, pli- 

 cated. Neck curved conical, 3 lines long. Ventral acetabulum oblique, pro- 

 minent, at the base of the neck, 3 lines in diameter, with a circular aperture much 

 larger than the mouth. Length 1 inch, breadth 4 lines. 



One specimen in the collection of the Academy. Locality unknown. 



30. DiSTOMUM VAGANS Leidy. 



Distoma hdicis Leidy, Pr. A. N. S., iii, 220. 

 Distornum pericardium Creplin, Arch. f. Naturg. xv, 78. 

 Distoma wigans Leidy, Journ. A. N. S., 2d ser., i, 304. 

 Cercariaeum helicis alternatce Diesing, Rev. d. Cere. 24. 

 Cercariacum vagans Diesing,'Rev. d. Cere. 24. 

 Found in Ueliz alternata and in H. albolabris. 



