NEMANEMA, TYCNODORA, SCHISTODERA 



231 



have not been satisfactory, but it appears as if there is a small, narrow, elongated 

 ventral gland a short distance behind the cardiac constriction, where the intes- 

 tine lies a little to one side. Each lateral field contains large ellipsoidal cells, 

 too large to be placed side by side within its limits; they are placed alternately 

 to one side and then the other. Their size is such that, in the neck at least, 

 if they were arranged single file they would make a continuous series a little 

 more than half as wide as the field and about one-third as wide as the body. 

 From the raised vulva, the vagina leads half way across the body, where it joins 

 the single uterus, which extends backward. The ovary reaches about half way 

 back to the vulva and contains a score or more of developing ova, which are 

 arranged for the most part single file. Anterior branch rudimentary. The elon- 

 gated eggs are about four times as long as the body is wide and about one-sixth 

 as wide as long. The tail of the male is slightly more arcuate than that of his 

 mate. Opposite the proximal ends of the spiculai, there is a very low, rounded, 

 ventral elevation. Near the ventral line in front of the anus for a distance two 

 to three times as great as the length of the tail there are a few minute setae, 

 about one-eighth as long as the body is wide, and immediately behind the anus 

 there are one or two similar setae; otherwise there are no indications of special 

 papillae or setae. Spicula about one and one-half times as long as the anal 

 body diameter. Their proximal ends lie near the dorsal side of the body. 



Habitat: Algae and marine sand at their bases, in surf, Island off Port Royal, 

 Jamaica. Sublimate to balsam. Fig. 2, p. 230. 



3. Tycnodora pachydermata n. sp. -36 i- 2 i-5 i-s .84 " " Cuticle thick, 

 glassy; near the head more nearly colorless, sometimes smoky, at any rate after 

 treatment with Flemming's solution; near the middle of the 

 body, occupying one-sixth the radius; near the spinneret 

 much thinner than elsewhere; rather suddenly diminishing 

 in thickness near the nerve-ring. Lining of oesophagus sub- 

 distinct; the musculature fine and colorless. There is no 

 cardia. The thin-walled intestine is separated from the 

 oesophagus by a collum one-fourth as wide as the body. The 

 lumen of the intestine is faint. From the depressed anus the 

 inconspicuous rectum extends inward a distance twice as 

 great as the anal body diameter. Very few granules are to 

 be seen in the intestinal cells. The contents of the intestine 

 are finely granular. The more or less arcuate tail is first co- 

 noid, then cylindroid in the posterior fourth, where it is about 

 one-fourth as wide as at the anus. The lateral fields are one- 

 half as wide as the body. From the inconspicuous vulva, 

 the cutinized vagina extends one-third the way across the 

 body. The somewhat cylindroid ovaries extend two-fifths 

 the way back to the vulva and carry twelve to twenty ova 

 arranged more or less single file. 



Habitat: "Seagrass," shoal, two miles off Key West, Fla., U. S. A. Flemming to 

 glycerine jelly. Resembles Halalaimus, but the female has two reflexed ovaries. 

 Fig. 3. 



<a M !" or 



s/a 



X750 



4. Schistodera exilis n. sp. .1 



The naked cuticle is 



extremely thin. From the mouth about one-third the way to the anterior mar- 

 gin of the lateral organs, the lining of the oesophageal tube is a little more mas- 

 sive than farther back. The amphids are interesting on account of the presence 



