BOLBONEMA, OMICHONEMA 265 



lining is more strongly developed in the bulb than it is elsewhere. There appears 

 to be an elongated cardia, perhaps one-third as long as the neck is wide. The 

 intestine begins as a narrow tube only about one-fourth as wide as the base of the 

 neck, and enlarges gradually so that near the middle of the nema it is about one- 

 half as wide as the corresponding portion of the body. For a distance behind 

 the bulb as great as the body-diameter, the cells of the set (4) 

 intestine contain nuclei which stain more strongly with 

 carmine than do their neighbors. Thence onward the 

 cells contain granules of variable size, the largest being 

 larger than any of the nuclei in any of the adjacent , 

 cells. The intestine shows about four cells in cross- "'.. 

 section; their contents are so disposed that there is .a \jjl 

 distinct tessellated effect. Anus slightly raised; the -?Hy : ^ : = : rg3\ X750 

 rectum as long as the anal body-diameter. There appears to be no doubt about 

 the existence of a unicellular renette cell just behind the neck, but the position 

 of the excretory pore is unknown. Lateral fields about one-third as wide as the 

 body. Tail conoid. From the slightly raised vulva, the vagina leads inward 

 fully one-third the distance across the body. The eggs appear to occur one at a 

 time in each uterus. They are fully twice as long as the body is wide, and con- 

 siderably less than half as wide as long. It seems probable that segmentation 

 sets in before the eggs are deposited. 



Habitat: Mud, shallows of Kingston harbor, Jamaica. Sublimate to balsam. 

 Fig. 49. 



1.1 8.8 . 19- -85. _ 



50. Omicronema litorium n. sp. 1.5 "*. : i-9 *-i 1-6 " " Cuticle rather 

 thin, naked, its striae more easily resolvable into rows of longitudinal markings 

 near the extremities. Wings faint. No labial papillae. Amphids yellowish. 

 Oesophagus at the nerve-ring one-half as wide as the middle of the neck; there- 

 after it expands somewhat, so that finally it is about two-thirds as wide as the base 

 of the neck. The oesophagus has a somewhat wavy lining. There is a narrow, 

 elongated cardia, nearly half as long as the body is wide. The intestine, set off 

 by a deep and broad constriction, becomes at once about three-fourths as wide 

 as the body. The lateral fields appear to be about one-fourth as wide as the body. 

 The female has a single outstretched ovary extending forward. From the more or 

 less conspicuous, depressed vulva, the rather weak, more or less cutinized vagina 

 connects with the straight uterus, which contains elongated eggs, twice as long 

 as the body is wide and about one-eighth as wide as long. The narrow ovary is 

 first cylindroid, then tapering. The larger ova are arranged single file; toward 

 the blind end, however, the ova are arranged irregularly. 

 The conoid, arcuate tail tapers from the anus, or from / 

 somewhat in front of it. The three ellipsoidal caudal ph ..^jflf^- Ml/r ^ 

 glands lie in a loose tandem in the anterior half of the tail. 



M 1.5-1.7 1.7 -11 i.T The tail of the male is W 



arcuate and conoid to the spinneret, which is one-sixth 

 as wide as the base of the tail. No supplements, though 

 there are inconspicuous setae on the submedian lines, both behind and in front 

 of the anus. The dark rather slender spicula attain their greatest width at 

 their bent middle parts. Accessory piece nearly as long as the anal body- 

 diameter. Near the bends of the spicula the accessory piece takes on a sigmoid 

 contour, and this portion is connected with the body wall both anteriorly and 

 posteriorly by strands of muscle. The ejaculatory duct is about one-third as 

 wide as the body. 



