BY N. A. COBB.^ 395 



head, and is armed with three teeth of which the left ventral sub- 

 median reaches to the lips, the others projecting but little into 

 the pharynx and reaching only three-fourths the way to the lips. 

 The oesophagus is at first only one-half as wide as the neck, but 

 becomes in the posterior part two-thirds as wide as the neck; 

 being very transparent its lining is distinctly to be seen. The 

 intestine, which is two-thirds as wide as the body, is separated 

 from the (jesophagus by a shallow but distinct constriction; its cells 

 contain granules so arranged as to give rise to an irregular tessel- 

 lation. The rectum is a little longer than the anal body-diameter. 

 The ventral gland empties through a narrow duct and an elongated 

 ampulla; the pore is situated just behind the oblique nerve-ring. 

 The lateral fields are one-fourth as wide as the body. The conoid tail 

 tapers more rapidly in the anterior part, the posterior part being 

 one-fifth as wide as the base of the tail. The caudal glands empty 

 at the barely expanded terminus. The inconspicuous vulva leads 

 into a vagina one third as long as the body is wide. The eggs 

 are two-thirds as wide as the body and four times as long as wide. 

 The reflexed parts of the ovaries extend three-fourths the way 

 back to the vulva. 



1-3 10-6 17- M 85- .IP, 1 1,1 



T^ — 5: 2T"¥3 1^ ""■ The tail of the male resembles that 



of the female in form. The two equal, simple, elongated, straight 

 and acute spicula when seen in profile appear to make an angle 

 of forty- five degrees with the axis of the body; they are of uniform 

 size throughout, being hardly at all thickened at the proximal ends. 

 The length of these organs, which is readily made out on account 

 of the general transparency of the body, is somewhat less than 

 that of the anal body-diameter. There are traces of accessory 

 pieces one-third as long as the spicula. I could discover no sup- 

 plementary glands or papillae. 



This nematode is to be found in sea-sand near low-tide mark. 

 Port Jackson, New South Wales, Australia. 



OxYSTOMA, Biitschli 



•1 9- 22- 

 'A, n.sp. ^3-Ti i:^ 



glassy cuticle of this graceful species is not marked in any way 



'1 9" 22' 29 94'3 



OxYSTOMA PELLUCIDA, n.sp. -3 1-2 — vi — 1^8 F "'^^ '^^"'' The 



