ISOLAIMIUM, COINONEMA 259 



little longer than the anal body-diameter, blunt, its ventral contour nearly 

 straight, its dorsal contour arcuate. The rather simple, blunt, uniform, more or 

 .**. A 5 . ."'. 53 !". .9-. 3.9.. less slender, arcuate 

 LZ w ''* spicula are about as 



.5-. 2 . A 6 . . r*r. .** , 8 long as the anal body- 

 diameter. Their non- 



cephalated proximal ends lie ventrad from the body- 

 axis. The frail, slender, arcuate accessory piece is 

 parallel to the spicula and one-third as long; at its prox- 

 imal end it has a very small, backward-pointing apoph- 

 ysis from which muscular strands pass forward to the 

 dorsally submedian lines and backward to the ventral 

 subait field near the middle of the tail. The six papilloid or 

 mammiform, sub-equidistant supplements occupy a 

 X 750 space about three times as great as the anal body-diam- 

 eter. Each comprises about six annules of the cuticle 



and has the same slightly crenate contour as the ventral surface. The tail bears 

 four pairs of flattish, conoid papillae, a little behind its middle; one dorsally 

 submedian, one lateral, one ventrally submedian and one subventral. 



Habitat: Soil, Plummer's Island, Potomac River, Virginia, U. S. A. Flem- 

 ming to glycerine jelly. Fig. 41. 



42. Coinonema punctatum n. sp. Lips thick. Neck conoid. Eye-spots two, 

 far apart, brown to yellow, solid, with backward connections. The cylindroid 

 oesophagus is at first one-half, at the nerve-ring one-third, and finally also one- 

 third, as wide as the corresponding portion of the neck ; lining subdistinct. There 

 is a cylindroid cardia one-fourth as wide as the base of the neck. The intestine, 

 set off by a collum one-fifth as wide as the base of the neck, becomes at once 

 three-fourths as wide as the body. Anteriorly it is thick-walled, posteriorly 

 thin-walled. Its cross-section is composed of four to five cells. These cells 

 contain numerous granules packed together in such a way as to give rise to a 

 faint tessellation. The granules are of variable size, the largest set subm \ Ib / ytqih 

 being one-tenth to one-sixteenthjas wide as the body. The anus 

 is continuous, the rectum three-fourths as long as the anal 

 body-diameter. The conoid tail tapers from the anus to the 

 rather minute spinneret. The three, broadly-saccate caudal pw Lfe 

 glands lie hi a close tandem in the anterior third of the tail. ' ., 

 The ellipsoidal renette cell stretches along behind the base of (f^llfe 

 the neck for a distance equal to 1 9 M > 52 i 87 jfe^lr^^t 



twice the width of the body; it 14; H IT? M aTT* 1 ' " #/j V//.' 



is two-thirds as wide as long. ^ 13 5 _^ ^ 



From the continuous, rather i.2/ 2.3 2.4 2.7"~^2.2 ?1- 

 inconspicuous vulva, the rather weak, non-cutinized, medium-sized vagina leads 

 inward one-third the way across the body. The eggs occur one at a time in each 

 uterus, and are one and one-half times as long as the body is wide. They appear 

 elongated in form and are deposited after segmentation begins. In the medium- 

 sized, tapering ovaries are ten to twelve ova arranged single file. The acute 

 spicula are rather frail and slender. Their proximal ends appear to lie ventrad 

 from the body-axis. A refractive "chord" appears to subtend the arc of the 

 spicula. The rather frail, somewhat slender, arcuate accessory pieces have an 



