1856.] 43 



9. Leucophrys clavata Leidj. 



Journ. A. N. S., 2d ser., ii, 50 ; iii, 144. 

 Found in the Liimbriculus limosus, and L. tenuis. 



10. Leucophrys cochlearipormis Leidy. 

 Journ. A. N. S., 2d ser., iii, 144. 



Found in the intestine of Lumbriculus tenuis. 



11. Leucophrys socialis Leidy. Cordate, ovate, oval, pyriform, or globular, 

 contractile, active, with one or many internal vacuoles ; striated, ciliated. 

 Length .036 to .045 mm., breadth .03 mm. 



Found very frequently and abundantly within the stomach of the remarkable 

 bryozoon Urnatella gracilis. (Pr. A. N. S., vii, 191.) 



12. Nyctotherus velox Leidy. 



Pr. A. N. S., T, 233 ; Trans. Am. Phil. Soc, 2d ser., x, 244. 

 From the large intestine of Julus marginatus. 



13. Nyctotherus ovalis Leidy. 



Pr. A. N. S., v, 100; Trans. Am. Phil. Soc, 2d ser., x, 244. 

 From the intestine of the common cockroach, Blatta orientalis. 



14. Albertia? pellucidus Leidy. 

 Anelcodiscus pellucidus Leidy, Pr. A. N. S., v, 28*7. 



MYZELMINTHA. 



15. ? MoNOSTOMUM iNCOMMODUM Leidy. Body compressed, above convex, below 

 concave, sides parallel, anteriorly convex, posteriorly angularly convex. Head 

 continuous with the body, obliquely truncated. Mouth round, surrounded with 

 a wide circular lip which is emarginate below. Male generative aperture ? com- 

 municating with a hemispherical cavity (acetabulum?) one fourth the length of 

 the body from the head. Length 9 lines, breadth 1^ lines. 



Five specimens were obtained from the fauces of the Alligator mississipiensis, 

 in Florida, by Prof. J. W. Bailey, of West Point. Is it probably a species of 

 Distomum, with the ventral acetabulum emersed within the body ? 



16. MoNOSTOMUM ORNATUM Leidy. Body slightly compressed ovoidal, anteriorly 

 broad ; yellow variegated with brownish red. Mouth infero-terminal, acetabuli- 

 form, transversely oval. Penis conical, protruding a short distance below the 

 mouth. Female aperture a short distance below the penis. Length 1 to 1 J lines, 

 breadth J to | of a line, thickness ^- to | a line. 



A dozen specimens were obtained from the abdominal cavity of Ranapipiens. 



17. MoNOSTOMUM renicapite Leidy. Body depressed, lateral margins parallel, an- 

 teriorly and posteriorly rounded, above convex, below concave. Head formed 

 by a transverse, reniform callosity. Mouth transversely crescentic, surrounded 

 with a double lip. Penis a small conical tubercle. Length from ^ an inch to 1 

 inch, breadth \i lines. 



Numerous specimens were obtained by Prof. Agassiz from the intestine of 

 Sphargus coriacea. 



18. ? MoNOSTOMUM MOLLE Leidy. Body depressed, elongated elliptical, posteriorly 

 convex. Head ? mouth ? Length 9 lines, breadth 2 lines. 



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

 in the lungs of two individuals of Siernotherus odoratus The species is so soft 

 that in the removal of the specimens I mutilated both, and since then I have 

 been unable to find others. 



19. DiSTOMUM lanceolatum Mehlis. 



Reported to exist in the sheep, Capra aries ; the ox. Bos taurus ; and the hog, 

 Sus scrofa. Stated to be frequent in the sheep, in several of the Western States. 



20. DiSTOMUM HEPATICUM. 



In the hepatic ducts of the Cervus virginianus. Though I have never seen 



