CROCONEMA 



333 



is about one-eighth as wide as the base of the head and is fairly well filled by 

 the apices of the teeth. Two of these onchia (?) have been distinctly seen, 

 a dorsal one which extends to the base of the lips and has a subacute, conical, 

 refractive apex, and whose base is about one-eighth as wide as the corresponding 

 diameter of the head, and a larger submedian one with a conical, refractive 

 apex, and having a base somewhat wider than that of the dorsal one. This 

 latter has a length somewhat greater than the width of the amphids, and its base 

 lies near the center of the head and rather behind the middle of the pharyngeal 



bulb. The pharynx is strongly aaipli on f Ib setqih 



cutinized, and manifestly extends 

 backward through the greater part 

 of the region surrounded by the 

 "helmet." The rather obscure 

 change from pharynx to oesoph- 

 agus takes place suddenly along 

 two loci which extend obliquely 

 outward and forward from the 

 lumen of the oesophagus. The 

 oesophagus retains the same diam- 

 eter until after it passes through 

 the nerve-ring; soon after that it 

 begins to enlarge gradually in 

 diameter, so that finally it is three- 

 fourths as wide as the base of the X 750 

 neck. The intestine is at first very narrow, about one-fifth as wide as the body, 

 and for a short distance has a different structure from the portion that follows. 

 Possibly this first part should be considered a cardia. In this cardiac portion, 

 there are no cells containing granules. Immediately behind the "cardiac" 

 portion, the intestine is half as wide as the body and would present eight to 

 ten cells in cross-section. The cells contain brownish granules of uniform size, 

 so arranged as to give rise to a distinct tessellation. The intestine is moder- 

 ately thick-walled. From the raised anus, the strongly cutinized rectum, which 

 is somewhat longer than the anal body-diameter, extends inward and then 

 almost directly forward, so that it joins the intestine considerably ventrad from 

 the body-axis. The tail is arcuate-conoid, and presents the peculiarity that 

 the annules of the cuticle cease in front of the middle; thence onward, the cuticle 

 is considerably thicker and is traversed by radial markings, which pass out- 

 ward and a little backward and give to the surface of this portion of the tail 

 a distinctly punctate appearance, which, however, is less marked than the 

 similar appearance on the head. The caudal glands are arranged tandem imme- 

 diately in front of the anus, extending from the end of the intestine proper to 

 a little behind the anus. There is apparently a small renette cell imme- 

 diately behind the oesophagus. The nerve-ring surrounds the oesophagus 

 obliquely. From the slightly elevated, rather inconspicuous vulva the vagina 

 extends nearly half way across the body. The ovaries reach more than half 

 way back to the vulva, and contain a dozen to twenty developing ova, arranged 

 irregularly. 



Habitat: Sand and marine algae, in surf, shore of small island off Port Eoyal, 

 Jamaica. Fig. 112. 



