SUBGENUS MYLONCHULUS 



(S. S. 469)] 57 



There is a flattish cardia. Anus raised. Longitudinal fields two-fifths to one-third 

 as wide as the body. From the more or less elevated vulva the vagina leads inward 

 at right angles to the ventral surface one-third the distance across the body. The 

 eggs are one and one-half times as long as the body is wide, and occur one at a 

 time in each uterus. The ovaries contain about a dozen developing ova. 



Sandy soil in a cranberry bog, Arlington Farm, Virginia, U. S. A. Also on the 

 margin of the spring that gives rise to Salt River, Jamaica. Flemming solution to 

 glycerine. Fig. 47 (at bottom of previous page). 



34. M. sigmaturus, n. sp. Two very inconspicuous submedian onchi are found 

 opposite the base of the dorsal onchus, just at the base of the rasps. Intestine 10 

 cells in girth, comparatively distinctly tessellated. The rectum is about as long as 

 the anal body-diam- 2.3 12. 30. >64' 14 96.3 

 eter, and is some- 

 what sigmoid. 



ll2 """ 



2.4 2 3s 2.4 



The anus is very distinctly visible on 

 account of its contour, and on account of the refractive 

 nature of the lining of the rectum. What appears to be 

 a renette pore exists immediately behind the nerve-ring. 

 The distinct lateral fields are about one-fourth as wide 

 as the body, and are characterized by the presence in 

 them of scattered granules much smaller in size than 

 those of the intestine. The posterior part of the tail is 

 somewhat digitate, and the whole is slightly sigmoid. From the anus the tail 

 tapers rapidly to near the middle, so that if the posterior half were lacking the 

 tail would be rounded. The diameter of the tail at the middle is about one-third 

 as great as at the base. From the middle onward the tail for a short distance is 

 of uniform diameter, and then tapers rather rapidly in the posterior fourth to a 

 rounded or subtruncated spinneret. Small, somewhat finger-shaped setae are found 

 on the tail ; one dorsally sublateral pair, a trifle in front of the anus ; another dor- 

 sally sublateral pair near the middle of the tail but located on the more bulky part ; 

 finally, a third ventrally sublateral pair a little in front of the digitoid part of the 

 tail. The caudal glands are opposite the rectum. The eggs are about two and one- 

 half times as long as the body is wide. The tapering ovaries contain 10 to 12 

 developing ova, arranged irregularly. 



Found in various parts of the United States and Mexico. Resembles minor and 

 brachyuris, from which it may be distinguished by the form and structure of the 

 tail. Flemming solution to glycerine. Fig. 48. 



35. M. subtenuis, n. sp. Wall and dorsal tooth of the pharynx rather strongly 

 developed. When the lips are closed the pharynx is hardly half as wide as long. 

 Dorsal tooth slightly arcuate, its point located close to the base of the lips. The 

 1.5 5.6 26. ^72' 22 97. x submedian teeth 



- 75 1>3 ; l. are easily con- 



-Mi 2 97. . fused with the 



He TTa TA 272 fTer denticles. Lining 



of the oesophagus well developed, occupying one-fourth 

 of the longitudinal optical section. There is a small 

 conoid cardia. Intestine probably about 6 cells in girth, 

 not definitely tessellated. Anus raised and conspicuous, 

 the anterior lip somewhat massive and overhanging. 

 The arcuate, conoid tail ends in a spinneret one-fifth to one-sixth as wide as its 

 base. The ovaries, of which the posterior is somewhat the smaller, appear to 

 contain about a dozen ova. Inconspicuous papillae appear on the ventral side of 

 the female near the vulva. Two were noted behind the vulva and one or more in 



1.5 



6.2 25. 



*" r/ * 



