174 MR. H. CHARLTON BASTIAN’S MONOGRAPH 
" sise of these animals appeared among a number of the decaying corpuseula from 
the Flustra carbasea, which they frequently penetrated as if in quest of food.” —Dalyell, 
84. PONTONEMA, Leidy. 
Proceed. of Acad. of Philad. vol. viii. (1856) p. 49. 
GEN. Cmar. “ Body capillary, narrowing towards the extremities. Head continuous with 
the body, truncated or obtuse, and surmounted with angular papillæ, cirrated. Eyes 
none. Tail obtuse. Generative aperture ventral, near the middle of the body. 
Qisophagus long, cylindro-clavate ; gizzard none, intestine straight, capacious; anus 
ventral and posterior.” 
1. P. vacıLLarum, Leidy. 
Journ. Acad. Philad. 2nd ser. iii. 144, et in Proceed. Acad. Philad. viii. (1856) p. 49. 
“ Body eylindroid 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 3th of a line.” 
“ Hab. Found on the sea-shore of Rhode Island, beneath stones, between tides.” 
2. P. MARINUM, Leidy. 
Journ. Acad. Philad. 2nd ser. iii. 144, et in Proceed. Acad. Philad. viii. (1856) p. 49. 
“ Body cylindroid; head convex ; mouth surrounded with angular papillæ.  Cirri 4, at 
the side of the head. Tail long, narrow, conical, obtuse. Length to 3 lines." 
“ Hab. Found at the bottom of a sound on the coast of New J ersey." 
3. P. MÜLLERL, Diesing. 
Vibrio Anguillula d. Anguillula marina, Müller, Anim. Infus. 66, Taf. ix. 9-11. 
Vibrio marina, Bory, in Encycl. Méth. (1824) 778, tab. xxiv. 26.—De Blainville, in Dict. d. Sc. Nat. 
lvii. 537, et lviii. 71. 
Anguillula marina, Oerst. De region. marin. 1844, 63 & 69. 
Enchelidium marinum, Ehrenb.—Diesing, Syst. Helm. i. 127 (partim). 
“ Corpus subæquale, retrorsum acutatum. Caput truncatum. Os cirrhis .... Longit. 
all. 
“ Hab. Inter mucosa palos marinos obvestientia, et in aqua marina servata frequentis- 
sime (0. F. Müller). In profunditate 0-8 orgyiarum, estate, in fretu Oeresund ( Oersted)." 
“Cum Vibrio marina, Müller, ocellis omnino destituta sit, cum Ænchelidio marino, 
Ehrenberg, identica esse non potest (Oersted, 1. c.)."—Sitzungsb. der Kais. Akad. 1861, 
(Bd. xlii.) S. 693. 
35. POTAMONEMA, Leidy. 
Proceed. of Acad. of Philad. viii. (1856) 49. 
GEN. CHAR. “ Body filiform, narrowing towards the extremities. Head continuous with 
the body, slightly dilated, obtuse. Mouth large, infundibuliform, unarmed. Es 
phagus narrow, flexuous, membranous, gradually expanding into a capacious, straight, 
