398 Zoological N. Y. Zoological Society. [I;20 



The body of the worm is elongated, slender and ends pos- 

 teriorly in a trumpet-shaped disc, which is armed with four 

 strong yellow chitinous hooks of a peculiar shape. There are 

 also in this locality a number of stiff hair-like processes which 

 extend some distance anteriorly from the disc along the poste- 

 rior end of the body. I wish to draw attention to the shape of 

 these hooks, which are shown in Fig. 134. The hooks in the disc 

 have as their foundation of attachment, two blocks of chitinous 

 material. These are placed, one anteriorly and the other pos- 

 teriorly in the wall of the hollow disc. They act with a certain 

 amount of motion as if jointed, and thus allow free action of 

 the hooks, which are under the control of the worm. 



The head is narrow and unarmed with a notch at the 

 anterior end which marks the situation of the mouth, and 

 on each side of this there are three tactile papillae which stain 

 more highly than the surrounding structure. These areas seem 

 also to furnish some secretion, since small ducts may be seen 

 proceeding backward from them as far as the pharynx. Their 

 function is, as in all of these worms, to afford mucus or saliva 

 to the pharynx and esophagus and to enable them to feel their 

 way about. Anterior to the pharynx are four ocular spots. The 

 pharynx is large relatively and is succeeded by a very short pos- 

 terior pharyngeal esophagus, since it divides almost at once 

 into the intestinal ceca. On each side of the pharynx and be- 

 ginning of the intestinal ceca are a number of unicellular glands. 

 A short distance posterior to this angle but also in the center of 

 the body is the genital pore surmounted by a very prominent 

 organ, the chitinous cirrus, which in this species is of the shape 

 of a sickle with the handle. 



The male genital apparatus consists of a single testis, oval 

 in shape and relatively large. It is situated posterior to the 

 ovary and the vas deferens passes dorsally over the ovary on its 

 way to the large ductus ejaculatorius ; this duct gives off a tube 

 which proceeds somewhat backward to enter the bulbus ejacula- 

 torius, being surrounded just before entering that organ by the 

 prostatic gland. The bulbus ejaculatorius is a more or less 

 round organ or muscular bag through which the vas deferens 

 passes to the base of the cirrus. The cirrus is peculiar. Its 

 shape being that of a sickle, including the handle, which latter 



