328 ORDER ANAXONCHIA 



distance from each other varying from one-sixth of one, to one, entire body- 

 diameter. The organs are nearly as high as they are wide, and are more or less 

 asymmetrical. Each is connected with an internal, refractive piece, a little 

 farther forward. They somewhat resemble the well-developed supplementary 

 organs of Chromadora. The ejaculatory duct is one-half, the vas deferens three- 

 fifths, as wide as the body. A considerable portion of the male sexual organs is 

 filled with spherical granular spermatocytes, one-third as wide as the body, and 

 having a distinct ectosarc. 



Habitat: Beach sand, Bathing Beach, Woods Hole, Mass., U. S. A. Flemming 

 to water. Fig. 107, p. 327. 



.6 10.5 tf- -*-*' 95. > . 6 



108. Cophonchus ocellatus n. sp. i._/ 1.9 * 3- T^i-9 ' Transverse 

 striae exceedingly minute; the cuticle is also longitudinally striated. The some- 

 on what cylindroid neck is almost imperceptibly convex- 

 conoid in its anterior part. Cuticle relatively thicker 

 on the head. A few short setae occur here and there on 

 the neck. There appear to be three somewhat confluent 

 lips with papillae on their outer margins, probably to 

 the number of six. There are two dark-brown dorsally 

 \~aiSC su bmedian eye-spots and opposite them in the ventral 

 portion of the oesophagus a linear collection of pig- 

 ^ mented granules, from which there also extends backward 

 a line of scattered granules. Similar granules occur 

 1 ^throughout the oesophagus in groups of a score or more. 

 Spear-like onchium very slightly sigmoid. It is probable that the pharynx 

 extends back to opposite the row of cephalic setae. The cuticle on the anterior 

 surface of the head, as far back as the cephalic setae or a little farther, reminds 

 one of the covering on the head in Thoracostoma, but the thickening is less pro- 

 nounced, and the cuticle here is not materially different in color or texture from 

 that elsewhere on the body. Where the cuticle reaches its maximum thickness, 

 near the lips, it is three to four times as thick as elsewhere on the body. From 

 this point backward to near the base of the head, it gradually grows thinner. 

 The oesophagus continues to have the same diameter until after it passes through 

 the nerve-ring; there it begins to enlarge, so that finally it is two-fifths as wide 

 as the base of the neck. The intestine, set off by a deep constriction, becomes 

 at once about two-thirds as wide as the body. Its cross-section would present 

 four to six cells packed with minute granules. The conoid cardia is one-fourth 

 as wide as the corresponding portion of the body. The renette cell is about 

 half as wide as the body, and is located on the ventral side just in front of the 

 cardia; its pyriform ampulla is one- fifth as wide as the corresponding portion of 

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

 and to contain numerous, rather small, scattered nuclei. The nerve-ring sur- 

 rounds the oesophagus squarely. Tail of the male conoid in the anterior four- 

 fifths; thence cylindroid for a short distance to the almost imperceptibly swollen 

 terminus. The caudal glands are apparently located opposite to and a little 

 behind the anus, and present the peculiarity that one of them, the one on the 

 ventral side, has a separate duct leading to the separate smaller ampulla in the 

 slightly enlarged spinneret, while the other two have their ducts parallel and 

 close together and appear to join in a single, much larger ampulla opposite the 

 smaller one. From these ampullae, minute ducts lead backward to the pore 

 of the spinneret, which presents a minute, conoid depression on the terminus. 

 Supplementary organ tubular, of about the same diameter as the spicula, extend- 



