ZALONEMA, PSEUDONCHUS 



273 



The intestine joins the middle of the posterior surface of the cardiac bulb, and 

 at this point the collum is nearly one-third as wide as the base of the neck. The 

 rather thin-walled intestine becomes at once about two-thirds as wide as the 

 body. From the nearly continuous anus, the tail is arcuate and conoid. There 

 are no supple- fi 

 mentary or- j^' '^ 



gans. The 

 moderately V?. . , 5 .^ . . ?-. 7 . . 

 stout spicula 1- 



taper to a blunt point in their distal halves. 

 At their widest part they are about one-fifth 

 to one-sixth as wide as the corresponding 

 part of the body; they are accompanied by X750 

 accessory pieces half as long. The distal ends of the accessory pieces are applied 

 closely to the spicula, but the proximal ends curve away slightly and then recurve. 

 The ejaculatory duct is about one-third as wide as the body. Apparently there 

 is but a single testis. 

 Habitat. Marine mud and sand, Noumea, New Caledonia. Sublimate to bal- 



58. Psendcmc/ms rotundicephalus n. sp. i^ i-5 i_J> '- 8 In most 



portions of the body longitudinal striations have been observed, apparently 

 connected with the cuticle rather than with the musculature. Neck cylindroid. 

 Lips two, each lateral. See Fig. 58. The mouth is very difficult to see in the 

 lateral view. In the dorso-ventral view it is easily seen, and is found to be a 

 dorso-ventral opening running across the head. Each lip has about six very 

 minute, refractive, double, cutinous markings, each presenting two blunt-edged 

 "teeth" directed toward the base of the pharynx. It appears that these repre- 

 sent foldings in the closed lips. In any case they represent, when viewed later- 

 ally, the roof of the pharynx, located opposite the bases of the anterior cephalic 

 setae. The elements in the pharynx opposite the anterior borders of the amphids, 

 which, at first sight, appear to be onchia, prove on careful examination to be 

 ridges, (see pseudon, in the illustrations). The pharynx is unusual in structure 

 and rather difficult to understand. The amphids of the female occur in about 

 the same position as those of the male, but instead of appearing spiral appear 



wind. The narrow oesoph- 

 agus has the same diameter 

 unt il it expands to form the 

 somewhat obscurely pyri- 

 form bulb, which is three- 

 fourths as wide as the base 



x750 mm W yn of the neck. There is a 



flattish cardia, about one-third as wide as the base of the neck. The intestine is 

 set off by a constriction about one-half as wide as the body, and in cross-section 

 presents about half a dozen cells. There appear to be faint indications of the 

 presence of wings. Renette unknown. Lateral fields are about one-fourth as 

 wide as the body. Nerve-ring oblique. The tail is convex-conoid to the termi- 



