RESEARCHES IN HELMINTHOLOGY AND PARASITOLOGY. 77 



Hab. — One specimen 16 inches long and j'jds of a line wide was 

 found in the intestine of Tropidonohis sipedon. In alcohol the speci- 

 men contracted to one-half the original length and widened to i 

 line. 



16. Tania Gibbosa, Leidy. Head minute, discoid ; acetabula 

 horizontal, contiguoiis, circular. Mouth not prominent, unarmed. 

 Neck long, broad, and thick. Segmented portion of the body com- 

 paratively short ; segments transversely oblong ; the last one dis- 

 coidal. Generative aperture not seen. 



Hab. — Two specimens, i V2 inches long, with the greatest breadth 

 ly'i lines, were obtained by Dr. L,e Conte from the intestine of a 

 species of Lamna inhabiting the Pacific coast of North America. 



17. Dibothriiim Piindatum, Rudolphi. Head r to \]A, lines long ; 

 oblong; bothria marginal, linear. Neck none. Anterior segments 

 cuneate or triangular ; posterior ones quadrate ; each with an ap- 

 pearance of three subdivisions, with the subsegments having a pair 

 of generative apertures in the course of a longitudinally depressed, 

 dark-colored line passing the length of the body. 



Length i foot, greatest breadth i^ lines. 

 Hab. — Intestine of Platessa plana. 



18. Ligula Monogramma, Creplin. 



A specimen imperfectly developed, 6 inches long, with the greatest 

 breadth 6 lines, was obtained from the abdominal cavity of the Mor- 

 rhua anuricana, and two specimens of almost the same length, with 

 the greatest breadth 5 lines, were obtained from the abdominal cav- 

 ity of Lcuciscus pulchcllus. 



[No. 152. See Bibliography.] 



EXTRACT FROM "CONTRIBUTIONS TOWARDS A KNOWLEDGE OF 



THE MARINE INVERTEBRATE FAUNA ON THE COASTS 



OF RHODE ISLAND AND NEW JERSEY." * 



Dp-;ndroccei,a. 



Monocdis Agilis, Leidy. Body elongated elliptical, anteriorly and 

 posteriorly subacute, black or fuliginous. Eye brown. Length one 

 line, breadth one-eighth of a line. Found actively creeping on 

 Mytilus ediilis. Point Judith. 



Planaria Freqiiens, Leidy. Body spatulate, posteriorly convex, 

 anteriorly narrowed ; head auriculate. Eyes two, reniform, distant. 

 Color above black, beneath gray. Length one to two lines, by one- 

 sixth to two-fifths of a hue in breadth. A small, quite active, and 



*Journal Acad. Nat. vSci., Phila.. 1S55. 



