1856.] 45 



CLINOSTOMUM Leidy. 



Head shorter than, and separated from the body by a lateral constriction op- 

 posite the ventral acetabulum, compressed semi-oval. Body compressed oval. 

 Mouth anterior. Ventral acetabulum, large, hemispherical, immersed within the 

 commencement of the body, and having a truncated conical aperture with the 

 apex posterior. A terminal pore to the body. 



31. Clinostomum gracile Leidy. Head semi-ovoid, anteriorly obliquely trun- 

 cated. Mouth transversely oval, with a prominent margin and a second border, 

 which is slightly emarginate below. Body compressed oblong, oval, convex 

 above, concave below, obtuse posteriorly, acetabulum larger, immersed between 

 the head and body. Length to 3 lines, breadth to 1 line. 



Found in the intestine of Esox - , and within cysts in the gills, fins, 



and muscles of Pomotis vulgaris. 



32. CiiiNOSTOMUM DUBiuM Leidy. Head compressed oval, convex anteriorly ; 

 mouth minute, not bordered. Body compressed oblong oval. Ventral acetabu- 

 lum immersed between the body and head. Length 2^ lines, breadth | of a 

 line. 



From the intestine of Rusticola minor. 



33. HoLOSTOMUM CORNU Nitzsch. 



Found in the small intestine of Ardea herodias. 



34. HoLOSTOMtJM NiTiDUM Lcidy. Body divided by a constriction at the an- 

 terior third, every where echinatod. Head ovoidal ; mouth terminal, round, 

 opening iuto a cup-shaped pharynx. Body compressed oblong oval, variegated 

 white with yellow. Length to I} lines, breadth 2-5ths of a line. 



Two specimens were obtained from the small intestine of Rana pijnens. 



35. DiPLODiscus SUBCLAVATUS Diesiug. 

 Found in the intestine of Rana pipiens. 



36. DiPLOSTOMUM CUTICOLA Dicsing. Head elongated elliptical, excavated in- 

 feriorly, obtusely angular, much longer than the body. Mouth small, round, 

 pharynx oval, gizzard oval. Generative apertures hemispherical, situated just 

 posterior to the middle. Body ovoid, with a terminal excretory pore. Length 

 from l-5th to ^ of a line. Contained in oval sacs about 2 a line in length. 



Found in great number in the liver of Pomotis vulgaris. 



0*1. AspiDOGASTER coNCHicoLA Baer. 

 Leidy, Pr. A. .IST. S., v, 224. 



38. Malacobdella grossa Blain. 

 Leidy, Pr. A. N. S., v, 209. 



CEPHALOCOTYLEA. 



39. Cysticercus fasciolaris Rud. 



Common in the liver of the rat, ilus decumanus. 



40. Cysticercus cellulos. Rud. 

 Occasionally in the muscles of the hog, Sus scrofa. 



41. Cysticercus tenuicollis Rud. 



Occasionally in the liver of the hog, Sus scrofa, and in the mesentery of the 

 sheep, Capra aries. 



42. Cysticercus elonoatus Leuck. 



in cysts, in the peritoneum of the european domestic rabbit, Lepus cuniculus. 



43. EcHiNOCOOCus granulosus Rud. 

 Echinococais polymorphus Diesing. 



From a cyst, of about three inches in diameter, lietween the muscles on the 

 right side of the abdomen, in an English sailor boy ; and also in two large 



