BTJNONEMA INEQUALE 103 



and three-parted, but destitute of striations. The more or less thin- 

 walled intestine, which is separated from the oesophagus by a very 

 distinct constriction, becomes at once about two-fifths as wide as 

 the body, and is made up of cells of such a size that about two are 

 required to complete its circumference. The lumen is often a dis- 

 tinct feature, on account of the refractive nature of the lining of the 

 intestine, and its zig-zag course indicates clearly the small number 

 of cells composing the circumference of the intestine. The intes- 

 tine often expands a short distance behind the cardiac collum, so 

 as to be two-thirds as wide as the bulb. The cells of the intestine 

 contain colorless, more or less scattered granules of variable size, 

 the largest of which have a diameter nearly equal to that of the pharynx, 

 the smallest of which are very much smaller. There is an indis- 

 tinct flattish cardia. There is no pre-rectum. The rectum is nar- 

 row and rather long and slender, usually about one and one-half times 

 as long as the anal body diameter. The anus of the female is usually 

 rather conspicuous, on account of the development of the anterior lip, 

 which in adults constitutes a flap extending backward over the anus 

 and outward from the surface of the body at a slight angle. This anal 

 flap is less pronounced in the young, and is almost altogether absent 

 in very young larvae. The tail begins to taper from some distance 

 in front of the anus, and is first convex-conoid and finally concave- 

 conoid, to the exceedingly acute, simple, unarmed, symmetrical ter- 

 minus. There is no spinneret, and there are no caudal glands, nor 

 have any definite lateral papillae, such as those of the female of Rhab- 

 ditis, been seen. The renette cell is probably located in the vicinity 

 of the cardia. The excretory pore occurs opposite the anterior por- 

 tion of the cardiac bulb, and usually empties on the right side of the 

 ventral wing. The rather inconspicuous nerve ring surrounds the 

 oesophagus somewhat obliquely. From the fairly well-developed 

 vulva the vagina leads inward at right angles to the ventral surface 

 about two-fifths the distance across the body, where it joins the two 

 symmetrically placed uteri, each of which is fully as long as the body 

 is wide. The reflexed ovaries extend back toward the vulva. The 

 eggs are of such a size that each uterus probably will hold only one 

 at a time. They appear usually to be about as long as the body is 

 wide, and about two-thirds as wide as long. The tail of the male has 

 the same general form as that of the female, but is characterized by 

 the development of the cuticle into a very rudimentary bursa. The 

 two equal, simple, frail, sub-arcuate, relatively long and slender, acute 



