262 



ORDER ISOLAIMIA 



one-third as wide as the middle of the neck, connected with the excretory pore 

 by a short, rather sharply curved, minute duct. The caudal glands are located 

 in a tandem series a considerable distance in front of the anus, that which is 

 farthest forward being somewhat farther from the anus than is the spinneret. 

 The tail is conoid in the anterior three-fifths in such a fashion that at the begin- 

 ning of the fourth fifth it has a diameter about one-fourth as great as at the anus; 

 thence onward the tail is cylindroid to the terminus which bears a slightly oblique 

 spinneret. From the inconspicuous vulva the rather strongly cutinized vagina 

 leads inward more than half way across the body. The ovaries reach about two- 

 thirds the distance back to the vulva, at any rate in the only specimen so far 

 examined, which was a rather immature female. Nothing is known concerning 

 the number, size and structure of the eggs. 

 Habitat: Green algae, Carlisle Bay, Jamaica. Fig. 45, p. 261. 



46. Cynura uniformis n. sp. ' 9 



" The rather thick cuticle 



is naked. The two wings, occupying a space one-third as wide as the body, 

 begin near the head and end on the tail. Pharynx very strongly reminiscent 

 of that of Plectus; is continued by a longer posterior 

 part, whose presence is indicated mainly by alterations 

 in the lining. This part, however, is rather easily dis- 

 tinguished from the oesophagus proper. Neck cylin- 

 droid posteriorly, convex-conoid anteriorly. The cylin- 

 droid oesophagus near the nerve-ring is three-sevenths, 

 finally three-fifths, as wide as the corresponding 

 portion of the neck. The radial oesophageal tissue con- 

 . I i\i\\ tinues to the middle of the anterior chamber of the 

 pharynx, but is narrower there. There is the faintest 



/.' ;; feIHi 5g2sL lV possible break in the lining of the oesophagus near the 

 oe nerve-ring, possibly the vestige of a bulb. There is a 

 large cylindroid cardia, three-fifths as wide as the neck. 

 The thick-walled intestine becomes at once two-thirds 

 as wide as the body; while its lumen is faint anteriorly, 

 it is very pronounced posteriorly. From the elevated 

 anus, the strongly-built, prominent rectum, the lining 

 of which is somewhat cutinized, extends a distance 

 three-fourths as great as the anal body-diameter. The 

 cells of the intestine are packed with granules of variable 

 size, the largest of which have a width equal to that of 

 X 750 one of the annules. The tail is cylindroid, then conoid 

 in the posterior three-sevenths. The blunt, conoid terminus is strengthened by 

 a large, obliquely-truncate cap, the several component plates of which are mi- 

 nutely punctate. The caudal glands probably lie in front of the anus; they end 

 in the terminus in three simple, prominent ampullae. There are no caudal setae. 

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

 ellipsoidal renette cell, two-thirds as long as the body is wide, and half as wide 

 as long, lies about two body-widths behind the base of the neck. The medium- 

 sized nerve-ring is accompanied by obscure nerve cells. From the medium- 

 sized, more or less elevated, refractive and therefore conspicuous vulva, the 

 vagina leads inward half way across the body. The inner wall of the vagina 

 is also cutinized. The short, broad, cylindroid ovaries contain about fifteen 

 ova arranged somewhat irregularly. Ellipsoidal granular spermatozoa, seen in 

 the uteri, are one-eighth to one-tenth as wide as the body of the female. 



