YPSILON, GONIONCHUS 315 



the tail. The ellipsoidal to broadly saccate caudal glands are packed in a close 

 tandem behind and opposite to the anus in the anterior three-fifths of the tail. 

 Their large, distinct ampullae are two-sevenths as long as the tail. There are 

 one or two slender setae at the middle of the tail, and near the terminus. The 

 lateral fields are about one-fourth as wide as the body. The much elongated 

 renette cell lies about one body-width behind the neck. The frail, strongly arcu- 

 ate, rather slender, tapering, subacute spicula are cephalated by a constriction 

 on the ventral side in such fashion that the proximal ends appear to be more or 

 less barbed. The simple, frail, very slender, arcuate accessory piece is one-third 

 as long as the spicula and presents a faint apophysis; its proximal end, like those 

 of the spicula, lies dorsad from the body-axis. At first it is parallel to the spicula, 

 then recedes and bends away at an angle of ninety degrees. There are three 

 faint and minute supplementary organs in front of the anus, occupying a space 

 one and one-half times as long as the body-diameter, little more than innerva- 

 tions. The posterior of these is opposite the distal ends of the spicula. The 

 distance between the first and second is equal to two-thirds, that between the 

 second and third, to one-half, the body-diameter. At the posterior end of the 

 middle fifth of the tail there is a somewhat raised small area supplied with two 

 subventral nerve endings. 



Habitat: Coarse sand, Beach, Devil's Island, Woods Hole, Mass, U. S. A. The 

 sexual organs are difficult to decipher on account of the granules in the intestine. 

 It does not seem advisable to refer this species to Acmaeolaimus Filipjev. The 

 following differences may be noted: (1) The cuticle is coarsely striated. 

 (2) The cephalic setae are in one circlet only. (3) The amphids are not "split." 

 (4) The pharynx is not open. (5) The dorsal organ is "Y "-shaped. Possibly 

 the Filipjevian specimen might have been referred to Camacolaimus de Man. 

 Fig. 96, p. 314. 



97. Gonionchus villosus n. sp. Annules separated by strongly refractive lines. 

 Neck conoid in the anterior half. About twice as far from the anterior extremity 

 as the amphids are four submedian groups of hairs, which are longer than the 

 cephalic setae. These groups consist of three each, arranged one in front of the 

 other, the members being separated by a distance equal to the width of one of 

 the annules. Similar submedian long and slender hairs occur throughout the 

 length of the body and are so numerous as to con- setqihdOJ H)(6l 

 stitute a very striking feature. The amphids at 

 first appear "O "-shaped; in reality, however, 

 they are spiral. The terminal flaps are hinged to 

 the lips, and the anterior portion of each lip appar- 

 ently is hinged to the main portion of the wall of (Ufa |jppsgj_. 00 



the head, which is itself unusually thin. Onchia 



apparently more or less plate-like. The oesoph- Mslficph(4)^iSk ' X 750 



agus continues to have the same diameter until 



after it passes through the nerve-ring; thereafter, 



it expands very little so that finally it is about j. 1 3._iq.4___24.____'_ -76_ ??.>, J4 .. 



two-thirds as wide as the base of the neck. There l6 */> M""'~ 



is a distinct conoid cardia, having a base about i..,___9.5___2_ 2 -- .-A-". .._*.>,, ,.. 



one-third as wide as the base of the neck. The " ^ '" 2 J 2 - 4 "^ 2 - 

 intestine becomes at once about two-thirds as wide as the body. It is rather 

 thick-walled, and its cross-section would present about four to six cells. 

 The lining of the intestine is refractive, so that the lumen is readily fol- 

 lowed; in fact it is a rather striking feature. The cells contain scattered yel- 



