50 [FebruarYj, 



99. Nema vacilans Leidy. Body white, glistening. Length Ij millemetreSj. 

 breadth .050 mm. Tail .115 mm. long. 



An active wriggling worm, found about some dead specimens of a black Phry- 

 ganea^ which was infested with a fungus parasite, and attached to stones at the 

 water's edge of a small brook near Philadelphia. 



100. Stbeptostomdm agile Leidy. 



Pr. A. N. S., iVy 230 ; v, 285 ; Flora and Fauna within Liv. An. 45. 

 Aorurus Leidy, Pr. A. N. S., iv, 230 ; t, 284. 



101. Streptostomum gracilb Leidy. 



Pr. A. N. S., It, 100 ; v, 285 ; Flora and Fauna, 46, 



In parte Oxyuris Diesingii Hammerschmidt, Isis, 354, (1848). 



In parte Oxyuris Blattce orientalis Hammerschmidt, Naturw. Ab. v. Haid., i., 284, 



la parte Anguillula macrura Diesing, Syst. Helm, ii, 134. 



102. Thelastomum attenuatdm Leidy. 



Pr. A. N. S., iv.^ 231 ; v, 285 ; Flora and Fauna, within Liv. An. 46, 

 Aorurus Leidy, Pr. A. N. S., iv, 230 ; v, 284. 



103. Thelastomum appendiculatum Leidy. 



Pr. A. N. S., V, 101 ; ib. 285 ; Flora and Fauna, 4'?. 



In parte Oxyuris Blattce orientalis Hammerschmidt, Naturw. Ab. v. Haid,, i., 284, 



la parte Anguillula macrura Diesiag, Syst. Helm, ii, 134. 



104. Thelastompm labiatum Leidy. 



Pr. A. N. S., T, 101 ; ib. 285 ; Flora and Fauna, 47. 



105. Thelastomum kobustum Leidy. 



Pr. A. N. S., T, 101 ; ib. 285 ; Flora aud Fauna, 48. 

 Thelastomum brevicaudatum? Leidy, Pr, A. N. S., v, 208 ; ibidem. 



106. Thelastomum venustum Leidy. Body of female fusiform, straight, with 

 the tail loag, narrow, conical, straight, acute. Body of male iacurved, with the 

 tail short, depressed, ending in a recurved subulate point, and having a pair of 

 oblong lobes or alae, extending the length ventrally. Generative and anal 

 apertures terminating together abruptly. Penis a curved, conical, acute spicu- 

 lum. Length of female to 2 ^ lines, breadth to one-fifth of a line ; length of male 

 to 1 line, breadth ^ of a line. 



Found in great number within the large intestine of Testudo polyphemus. Ob- 

 tained by Mr. Joseph Jones in Georgia. It is a singular fact, that this species is 

 infested with vegetable parasites, as ia the case of those fouad ia myriapods and 

 iasects. 



lOT. ASCARIS VERMIC0LARIS Liu. 



This species is the most common of all the parasitic worms, in the anglo-ameri- 

 can. 



108. ASCARIS LUMBRICOIDES Lin. 



This species is the second of the most commoa of parasitic worms ia the anglo- 

 araericaa. 



Ia the University museum, there is a preparation of the liver of a boy, in which 

 a number of individuals of this worm have forced themselves into the divisions 

 of the hepatic duct. 



Frequent also ia the small iatestiaes of the hog, Sus scrofa. 



109. ASCARIS LEPTOPTERA Rud. 



Ascaris Felis discoloris Leidy, Pr. A. N. S., v, 155. 



Fouad ia the small intestiae of the panther, Felis concolor. 



110. Ascaris mystax Rud. 



Commoa ia the domestic cat, Felis catus. 



111. AaCARIS MARGINATA Rud. 



Frequeat iu the dog, Cants familiarit. 



