ii8 Journal of Agricultural Research voi. vi, no. 3 



tudinal striae are not present on the lateral fields, this naked space being one-third to 

 one-half the width of the body. The slightly conoid neck becomes slightly convex- 

 conoid near the head, the lip region of which is set off by a very broad, almost imper- 

 ceptible constriction. There are six strongly developed and fairly distinct lips, 

 each ending in a conoid tip, from the sum.mit of which issues a very short innervated 

 bristle-like papilla. The lips have a more or less distinct refractive framework and 

 are in all probability quite mobile. Usually in specimens which have been fixed in 

 Flemming's solution the tips of the lips are slightly outward-pointing, leaving a 

 somewhat circular refractive mouth opening about two-fifths as wide as the front 

 of the head. The inner surface of the lips is so strongly refractive that usually the 

 posterior limits of the lips are distinctly visible, more particularly as the wall of the 

 pharynx at this point is encircled by a very delicate refractive line lying considerably 

 in front of the middle of the pharynx. This latter appears to be irregularly cylin- 

 droid, but is slightly unsymmetrical at the base. On the whole, it is about two- 

 fifths as wide as the head. It appears to possess at the base a rather well-developed 

 but blunt, slightly inward-projecting process or tooth. In the lateral view, as the 

 posterior part of the pharynx appears to pass around this projection, it acquires the 

 slightly unsymmetrical contour already mentioned. The walls of the esophagus are 

 rather distinctly ceratinized. The esophagus begins at the base of the pharynx as a 

 tube two-thirds as wide as the base of the head and continues to have this diameter, 

 or a slightly greater, until it reaches a point halfway back to the median bulb. Thence 

 onward it diminishes slightly, so that just in front of the median bulb it is only half 

 as wide as the middle of the neck. The median bulb is a well-developed, elongated 

 or ellipsoidal, radially muscular structure, with a somewhat distinct elongated but 

 narrow valve. This bulb is about two-thirds as wide as the middle of the neck. 

 Behind the median bulb the esophageal tube continues with a diameter one-third 

 to two-fifths as great as the corresponding portion of the neck but diminishes very 

 slightly, so that just in front of the ellipsoidal cardiac bulb it is less than one-third 

 as wide as the corresponding portion of the neck. The cardiac bulb contains a rather 

 distinct and rather complicated threefold valvular apparatus and is capable of open- 

 ing out posteriorly, so that the lumen of the posterior part of the bulb, where it 

 debouches into the intestine, then becomes one-fourth as wide as the corresponding 

 portion of the body. The lining of the esophagus is a distinct feature throughout 

 its length. The intestine, which is thin-walled at first, is separated from the esophagus 

 by a distinct constriction. It becomes at once four-fifths to five-sixths as wide as 

 the body and presents at the beginning a distinct cardiac cavity. There is also a 

 distinct cardia. The cells of the intestine, which are of such, size that probably four 

 are required to build a circumference, contain rather large nuclei and are packed with 

 granules of variable size, the largest of which have a diameter as great as the distance 

 between two of the longitudinal striae, the smallest of which are very much smaller. 

 The lining of the intestine is refractive, so that the lumen is usually quite a distinct 

 feature. From the slightly raised anus the narrow, refractive, ceratinized rectum, 

 which is one and one-half to two times as long as the anal body diameter, extends 

 inward and forward. The tail end begins to taper from some distance in front of 

 the anus but in front of the anus tapers only very slightlj-. Behind the anus it tapers 

 rather regularly to an acute point. Near the middle of the tail there appears to be a 

 lateral papilla on each side. From the slightly raised, rather broad vulva the vagina 

 leads inward at right angles to the ventral surface nearly halfway across the body, 

 where it joins the two uteri, which extend in opposite directions. The reflexed 

 ovaries reach more than halfway back to the vulva, at any rate in apparently young 

 specimens in which no eggs exist in the uterus. The ova in the ovary are arranged 

 more or less single file for about half its length; toward the blind end they are 

 arranged irregularly. Fertilized females show sperm cells in the uterus of such a 



