78 RESEARCHES IN HELMINTHOLOGY AND PARASITOLOGY. 



remarkably a]:)mKlant species, found beneath stones, near high-tide 

 mark. Point Judith. 



Nemertes Socialis, Leidy. Body long, linear, flattened, anteriorly 

 subacute, anteriorly obtuse or subacute ; usually black above, and 

 brownish ash-colored beneath, occasionally brownish ash-colored 

 with the anterior extremity tipped with black. Head not constricted 

 from the body. Eyes two to four pairs, arranged longitudinall}- on 

 each side, length up to six inches, by one-third of a line in breadth 

 Very abundant, often in masses, about the roots of corallines between 

 tides. Point Judith. 



Meckelia Ingais, Leidy. Body long, tape-like, narrowed posteri- 

 orly, cream- colored. Head obtusely angular, depressed ; lateral fis- 

 sures deep. Generative aperture a longitudinal fissure. Described 

 from a specimen preserved in alcohol, and measuring in its present 

 condition fifteen inches in length, eight lines in breadth, and three 

 and a half lines in thickness. It was obtained by Mr. Chas. C. 

 Ashmead from an oy.ster bed at Beesley's point, New Jersey, and 

 when alive measured more than a yard in length. 



Nematoidea. 



Pontonema, Leid)'. Body capillary, narrowing toward the extremi- 

 ties. Head continuous with the body, obtuse, pointed, with short 

 cirri. Ej'es none, caudal extremity obtuse. Generative aperture 

 near the middle of the bod3^ CEsophagus long, cylindrical ; intes- 

 tine cylindrical. Ovaries two. Allied to Amblyura. Marine. 



Pontoncma \^aciUatinn,\^^\Ay . Body cylindroid, with minute cirri 

 anteriorly in addition to those around the head. Tail short, obtuse, 

 incurved. Color brownish w^hite. Length to three-fourths of an 

 inch, by one-fifth of a line in thickness. Found abundantly beneath 

 stones, between tides, at Point Judith. 



Poiitonema Marinimi, Leid}'. Body cylindroid. Tail long, narrow, 

 blunt. Color white. Length to three lines. Obtained from an 

 oyster bed, in about six feet of water, in one of the sounds near 

 Atlantic City, New Jersey. 



Entozoa. 



Gregarina . Body elliptical ; head oblate spheroidal. 



Length .225 mm. , breadth .072 mm. From the intestine of Nereis 

 deiiticulata. 



Leucoplirys Clavaia, Leidy. (Journ. Acad. Nat. Sc, ii, 50.) In 

 the visceral cavity of Liniibricu/iis tenuis. 



