POROCOMA, LITONEMA 237 



to the width of two of the adjacent annules; tessellated effect faint. The tail, 

 which tapers from in front of the anus, is conoid, and then cylindroid in the pos- 

 terior half, where it is about one-half as wide as at the base Apparently the 

 ellipsoidal caudal glands are packed in a close tandem in the anterior fourth of 

 the tail. The lateral fields are one-half as wide as the body. The elongated, 

 outstretched, granular renette cell lies one to two body-widths 

 behind the base of the neck. It is two to three times as long as the ,.j 

 base of the neck is wide and about one-fourth as wide as long. The 

 broad oblique nerve-ring is accompanied by obscure nerve cells. 

 While both ovaries are essentially behind the vulva, one of them ~i " ! J M 

 extends forward a distance about twice as great as the correspond- *TI ':! H3i 

 ing body diameter, and is then reflexed, and extends backward, so *" 

 as to lie parallel to the other. The medium-sized, but rather conspicuous vulva 

 is continuous with the ventral surface. The rather strongly cutinized vagina 

 extends inward two-fifths the way across the body. It is possible that the nar- 

 row, cylindroid ovaries are reflexed for a short distance near their blind ends. 



Habitat: Biscayne Bay, from sponges and associated material. Flemming to 

 glycerine jelly. Fig. 11. 



II. Order Bolbinia 



12. Litonema nudum n. sp. **/ 3 - 5 *?. 4 -9 * -O-- The presence of the 

 two wings, which begin on the neck and end near the anus, is indicated by two 

 refractive, longitudinal markings, which occupy a space equal to one-fourth to 

 one-third the width of the body. The cuticle is entirely naked. There appears 

 to be a vestigial pharynx nearly as long as the base of the head is wide, simple, 

 narrow, tubular, obscure. The neck is conoid. Almost on the front of the head, 

 but near its margin, there are two minute, lateral pores, which may possibly be 

 amphids. Connected with these pores are inner tubular elements, which may 

 be followed backward for a considerable distance. The more or less cephaloboid 

 oesophagus has a very faint, elongated, posterior swelling, one-fourth as wide as 

 the base of the neck. Near the pharynx the oesophagus is one- / 

 third, near the nerve-ring one-eighth, and in front of the 

 cardiac swelling one-seventh, as wide as the corresponding 

 portion of the neck. The optical expression of the lining of P" 

 the oesophagus consists of two distinct, refractive lines, hav- 

 ing a distance apart about equal to one-tenth the width of jnsc 

 the oesophagus. There is no cardia. The thick-walled intes- 

 tine presents a faint lumen, and becomes at once five-sixths 

 as wide as the body. Anus continuous; rectum inconspicu- " 

 ous. The cells of the intestine are packed with granules 

 of rather uniform size, the largest of which are one-seventh * 750 i 

 as wide as the body. The conoid tail tapers from in front of the anus. There 

 are no caudal glands. The lateral fields are probably one-third as wide as the 

 body. The excretory pore and the duct leading to it are so refractive as to be 

 easily visible. 



Habitat: About the roots of the lady's slipper, Cypripedium acaule Linn., 

 sphagnum swamp, Wisconsin, U. S. A. Flemming to balsam. Fig. 12. 



