HALINEMA 



267 



52. Halinema spinosum n. sp. There are a few, very inconspicuous cervical 

 setae, one-third as long as the neck iswide. Cephalic setae three-jointed (Fig. 

 1, 2, 3). Lips three, possibly double. Neck more or less cylindroid. Oesophagus 

 cylindroid, with an almost imperceptible cardiac swelling; at the nerve-ring 

 four-sevenths, and finally three-fourths as wide as the corresponding portion of 

 the neck. The sub-distinct lining of the oesophagus is optically expressed by 

 refractive lines occupying a space two-sevenths as wide as the organ itself. The 

 colorless musculature is rather coarse. No cardia has been noted, but the intestine 

 is at first more refractive in its lining, and otherwise altered. The thick walled 

 intestine is set off by a collum one-fourth as wide as the neck, and has a faint, 

 but somewhat refractive lining. It soon becomes two-thirds as wide as the body, 

 and in cross-section is composed of few cells. From the anus, the posterior lip 

 of which is elevated, the rather inconspicuous rectum leads inward a distance 

 three-fourths as long as the anal body diameter. The intestinal cells contain 

 scattered granules of variable size, the largest of which are about one-tenth as 

 wide as the body; they darken on treatment with Flemming's solution, and are 

 strongly refractive in glycerine jelly. The conoid tail tapers from the anus. 

 The broadly saccate caudal glands, three in number and relatively small, form 

 a close tandem in the anterior eighth of the tail. The posterior half of the tail 

 bears eight pairs of ventrally submedian stiff setae. The rather fusiform, non- 

 granular renette cell lies on the ventral side of the body a little behind the base 

 of the neck; it empties through a rather conspicuous ampulla one-third to one- 

 fourth as wide as the corresponding portion of the neck. The nerve-ring is of 

 medium size and . 7 3 . 2 6 . 8 "_ 5? .> ?3 ^^ 

 is accompanied * J -V i-3 i-'' ' "i. ' 

 by obscure nerve .4 2.3 4.3 -H-<" 90. ?26 

 cells. The fe- ' 8 ' V V ' ' '"'**" 

 male sexual apparatus presents a vestigial pos- 

 terior branch. Vulva rather large, somewhat 

 elevated; vagina more or less cutinized. The 

 eggs are five times as long as the body is wide, 

 and evidently occur in the uterus one at a time. 

 The narrow tapering ovaries contain few ova 

 arranged single file. The spicula are rather 

 strong, somewhat slender, tapering and acute. 

 Their expanded proximal ends appear to lie ven- 

 trad from the body-axis. The applied parts of j^ 

 the two rather frail accessory pieces are one- 

 fourth as long as the spicula. They have taper- 

 ing apophyses, one-third as long as the anal 



body diameter, whose proximal ends lie ventrad from the body-axis. Papilloid 

 sub-equidistant supplementary organs on the ventral line occupy a space five to 

 six times as long as the body diameter, the distance between them being about 

 equal to three-fourths the corresponding body diameter. Of these almost imper- 

 ceptible innervations, the posterior one lies opposite the distal portions of the 

 spicula. Ejaculatory duct two-fifths as wide as the body. There seem to be 

 two narrow, tapering testes, but there is a little uncertainty about the posterior 

 one. 



Habitat: Sand bar, opposite the mouth of the Miami River, Biscayne Bay, 

 Florida, U. S. A. Flemming to glycerine jelly. Fig. 52. 



