SYNONEMA, ANTIC YCLUS 331 



prominent cutinized rectum extends inward a distance equal to the anal body- 

 diameter. Anal muscles are dimly to be seen. The intestinal cells have conspic- 

 uous nuclei, and as there is an almost entire absence of granules, the intestine 

 is very transparent. Tail arcuate, conoid. The three saccate caudal glands 

 form a close tandem in the anterior half of the tail; they 

 empty through separate ducts and ampullae. No caudal 

 setae are to be seen. The lateral fields have not been 

 clearly seen; they are probably one-third as wide as the 

 body and composed mainly of two rows of cells. The 

 granular renette cell is three times as long as the body is 

 wide and one-sixth as wide as long. It is placed from two 

 to six body-widths behind the neck, and seems to be com- 

 posed of about six ellipsoidal, granular cells, arranged more or less in pairs. 

 The excretory pore is two-fifths the way back to the nerve-ring; there is no 

 ampulla. The nerve-ring is accompanied by distinct nerve cells arranged in 

 groups. The following description of the sexual organs is derived from an 

 immature specimen: The tubular, muscular, more or less cutinized vagina 

 extends obliquely forward two-thirds the distance across the body, where it 

 joins the straight uterus, which is about twice as long as the body is wide. Ova 

 prolate; the maturest six to eight being arranged single file, the others irregu- 

 larly, about thirty in all. Ovary medium-sized and tapering. Male unknown. 

 Habitat: Algae, near lighthouse, Bahia, Brazil. Sublimate to balsam. The 

 multicellular renette is highly peculiar. Fig. 110. 



111. Anticyclus exilis n. sp. Cephalic setae sixteen, subcephalic four; cuticle 



otherwise naked. The rather thin lips, apparently six in number, arch together 



over the pharynx, somewhat as in Oncholaimus. According to the state of the 



muscular contraction in the lips, the head is 



_J ti ^1 -i|_ 55^ > 2.2- slightly convex on the front surface, or slightly 



70 concave. Margins of the amphids strongly refrac- 



jj* |;^ H Tsu-vts* 2 - 9 " tive > so that their contours are exceedingly dis- 

 tinct. At first, the oesophagus has a diameter 



fully two-thirds as great as that of the corresponding portion of the neck, and 

 it retains this diameter until after it passes through the nerve-ring; about half 

 way between the nerve-ring and the intestine, it begins to expand, and continues 

 to do so very gradually, so that finally it is about three-fourths as wide as the 

 base of the neck. The anterior cells of the intestine are more transparent and 

 otherwise different in appearance from those which succeed, and it not infre- 

 quently happens that they present a strong resemblance to the oesophagus, 

 so that the real position of the cardiac constriction is likely to be mistaken. 

 The intestine is at first about two-thirds as wide as the body. It soon, how- 

 ever, becomes three-fourths to four-fifths as wide as the body, and is composed 

 of rather massive cells, so that the lumen is narrow. Its cross-section prob- 

 ably presents about six cells. These contain numerous granules, rather uni- 

 form in size and so arranged as to give rise to an indistinct tessellation. From 

 the inconspicuous anus, the rectum, which has about the same length as the 

 anal body-diameter, extends inward and forward. The lateral fields are one- 

 third as wide as the body. Renette unknown; it is possible that the renette cell 

 is unusually small and located near the cardiac constriction. The tail of the 

 female is supposed to be like that of the male described below, but there is 



