68 RESEARCHES IN HELMINTIIOLOG Y AND PARASITOLOGY. 



Whole length of an individual of three segments i line; breadth 

 I -570th inch. Breadth of upper lip i -500th inch. First segment of 

 the body with 7 annuli ; second with 5 ; the third with 9. 



Habitation. — Found in stagnant ponds and ditches. 



Remark. — Allied closely to Acolosoma. 



Stvlaria, Lamarck. 



1. Stylaria Paliidosa, lyamarck. 



Nais proboscidea, Linn. vSyst. Nat.. 13th ed., vol. i, pt. 6, 3121. 



Body cylindroid, colorless, transparent. Without segmentation 

 from 15 to 20 annuli ; one of two segments 40 annulations. Podal 

 spines, 7 to 10 in each fasciculus, long sigmoid, hooked and bifid at 

 the free end. Setse commencing after the fifth annulus from the 

 mouth, usually single, occasionally two, from i -400th inch to i-66th 

 inch in length. Caudal annulus truncated, sinuous, fringed with 

 short stiff hairs. Upper lip broad, emarginate, with a cylindroid, 

 flexible, proboscidiform appendage from i-33d to i-25th inch long 

 projecting from its notch, fringed with short stiff hairs. Eyes 

 two, transverse reniform, situated one on each side of the mouth. 

 Mouth triangular ; pharynx capacious, oesophagus cylindrical, ter- 

 minating in the intestine at the third .se'.ous annulus. 



Whole length from 2 to 4 lines ; breadth i-6th line. 



Habitation. — In ditches and ponds in the neighborhood of Phila- 

 delphia. 



2. Sty /aria Fossu/aris, Leidy. 



Body of two segments, composed of 24 annuli in the first, 22 to 

 the last, Podal spines 5 to 7 in each fasciculus. Setae commencing 

 after the fifth annulus, usually double, to i-66th inch long. Upper 

 lip broad, demi-oval, compressed, not emarginate, with a cjdindroid, 

 flexible, proboscidiform appendage i-33d inch long projecting from 

 its summit. Eyes two, transverse, one on each side of the mouth. 

 Pharynx capacious, extending to the 4th annulus ; oesophagus cylin- 

 droid, tortuous, extending to the 7th annulus. 



Whole length 4)^ lines ; breadth i-6th line. 



Habitation.— Found with the preceding, 



Anklcodiscus, Genus novum. 



Body cylindroid, smooth, posteriorly terminated by a cordiform, 

 retractile acetabular disk. Mouth and anus terminal. Intestine 

 simple, straight. 



I. Anclcodisais Pcllucidn^, Leidy. 



