1856.] 



49 



Common in ordinary cider vinegar. 



90. Anguillula glutinis Ehrenberg. 

 Common in paste of wheat, rye, tragacanth, &c. 



91. Anguillula socialis Leidy. 

 Oxyuris socialis Leidy, Pr. A. N. S., v, 102. 



Found in the intestine of the black cricket, Acheta abbreviaia. 



92. Anguillula longa Leidy. 

 Pr. A. N. S., V, 225. 



Found in ditches near Philadelphia^ 



93. Anguillula fossularis Leidy, 

 Pr. A. N. S., V, 226. 



Found in stagnant ponds near Philadelphia. 



94. Amblyura sbrpentulus ? Hemp, et Ehrenb. 



Anguillula longicauda Leidy, Pr. A. N. S., v, 225. Mouth with cirri {error in 

 the previous observation and description). Tail long, subulate ; suctorial disk ex- 

 ceedingly minute, clavate. Length to one-fortieth of an inch. 



Common about gutters and water spouts in Philadelphia. 



95. Hystrignathus rigidus Leidy. 



Pr. A. N, S., V, 102 ; Flora and Fauna within Liv. An. 4-1. 



PONTONEMA Leidy. 



Body capillary, narrowing towards the extremities. Head continuous with 

 the body, truncated, or obtuse and surmounted with angular papilla?, cirrated. 

 Eyes none. Tail obtuse. Generative aperture ventral, near the middle of the body. 

 (Esophagus long, cylindro-clavate ; gizzard none, intestine straight, capacious ; 

 anus ventral and posterior. 



96. PoNTONEMA VACILLATUM Lcidy. 



Jour. A. N. S., 2d ser. iii, 144. Body cylindroid, anteriorly with longitudinal 

 rows of short cirri in addition to those of the head ; posteriorly incurved ; tail 

 short, thick, conical, obtuse. Length to 9 lines, breadth to one-fifth of a line. 



Found on the sea shore of Rhode Island, beneath stones, between tides. 



97. PoNTONEMA MARINUM Lcidy. 



Jour. A. N, S., 2d ser., iii, 144. Body cylindroid ; head convex ; mouth surrounded 

 with angular papillaj. Cirri 4, at the side of the head. Tail long, narrow, coni- 

 cal, obtuse. Length to 3 lines. 



Found at the bottom of a sound on the coast of New Jersey. 



POTAMONEMA Leidy. 



Body filiform, narrowing towards the extremities. Head continuous with 

 the body, slightly dilated, obtuse. Mouth large, infundibuliform, unarmed; oeso- 

 phagus narrow, flexuous, membranous, gradually expanding into a capacious, 

 straight, cylindrical intestine ; anus none ? or exceedingly indistinct. Caudal ex- 

 tremity obtuse. Generative aperture of the female near the middle of the body. 



98. PoTAMONEMA NiTiDUM Lcidy. Body cylindroid, most narrowed anteriorly. 

 Head without appendages. Caudal extremity broad, obtusely conical. Length 

 5 lines, breadth one-fifth of a line. 



An active, wriggling, glistening white worm, found among beds of Valisneria 

 americana, growing in the river Schuylkill, near Philadelphia. 



NEMA Leidy. 



Body ascaridiform. Head without appendages. Mouth unarmed, large, in- 

 fundibuliform, oesophagus tubular, membranous, expanding into a simple straight 

 intestine ; anus ventral. Tail conical, acute, recurved. Generative aperture 

 near the middle of the body. 



