RESEARCHES IN HELMINTHOLOGY AND PARASITOLOGY. 43 



3. Rhynchoscolex, n. g. — Body cylindrical, soft, naked, trans- 

 versely and finely striated, vibrillated, anteriorly elongated into a 

 proboscidiform appendage. Mouth inferior ; anus terminal. In- 

 testine simple, straight. Eyes none. 



3. Rhynchoscolex Simplex. — Yellowish white, opaque, anteriorly 

 abruptly attenuated into a long, cylindrical, clavate proboscidiform 

 appendage ; anteriorly abruptly narrowed, obtusely truncate or 

 rounded. Proboscis presenting longitudinal and numerous trans- 

 verse marks. Mouth inferior, at the base of the latter appendage. 

 Intestine straight and capacious. 



lycngth 2 to 3 lines; breadth i-6th of a line ; proboscis i-i33d 

 inch long, but may lengthen to i-8oth inch. 



Habitation and Remarks. — A small wriggling worm found among 

 3'ellowish fragments of vegetable matters and confervae at the bottom 

 of clear brooks in the vicinity of Philadelphia. Under a very little 

 pressure it undergoes rapid disintegration into globular masses 

 (cells of the structure distended by endosmosis ?) . 



I. Emea.'^^"- — Body elongated, plano-convex, soft, proteiform, 

 naked, covered with minute vibrillae. Alimentarj^ canal simple, 

 tortuous, furnished with a gizzard containing a dental apparatus. 

 Mouth and anus terminal. Eyes two or three, on each side of 

 head. 



I. Einea Rubra. — Elongated, compressed, contracting irregularly, 

 broadest posteriorly, anteriorly obtuse, yellowish flesh colored. 

 Head semi-oval, neck projecting laterally. Eyes, two or three 

 black spots placed in a line behind one another on each side of the 

 head and neck. Mouth simple, opening into a narrow pharjmx. 

 Intestine cylindrical, narrowed posteriorly, furnished with a small, 

 round, muscular stomach containing a corneous dental apparatus 

 at its entrance. Generative apparatus consisting of two ver}- tor- 

 tuous and capacious tubes, passing the whole length of the bod}- on 

 each side of the alimentary canal. 



Eength from 3 to 10 lines ; breadth i-5th to i-3d of a line. 



Habitation and remarks. — Found in marshes in the vicinity of 

 Philadelphia, creeping upon dead vegetable substances or upon the 

 ground. When touched or irritated it secretes a large quantity of 

 very tenacious mucus. Under slight pressure it will voluntarily 

 evert more than one-half of the intestinal canal through the mouth, 

 and, upon removal of the pressure, after some minutes will again 



* Emea : f/y.ew. from the disposition the animal has to protrude or vom.it forth 

 the anterior part of the intestine. 



