278 



ORDER APODONTIA, ORDER SYNODOXTIA 



three glands which empty at the mouth. There is a cylindroid cardia two- 

 sevenths as wide as the base of the neck. The thick-walled intestine is set off by 

 a collum one-third as wide as the base of the neck, and becomes at once one-half 

 to three-fifths as wide as the body. Its cross-section is composed of four to six 

 cells. It has a faint zig-zag lumen. Very fine, colorless, more or less polyhedral 

 granules of variable size are found scattered in the intestinal cells. The largest 

 of these are one-twenty-fifth as wide as the body. They give rise to no more 

 than a faint tessellation. The more or less arcuate tail of the male tapers from 

 in front of the anus, and is first conoid then cylindroid and two-fifths as wide as 

 at the anus. The caudal glands are probably preanal. There are no caudal 

 setae. The lateral fields are one-fourth as wide as the body, and faintly granular. 

 The very frail, straight, slender, subacute spicula become arcuate near the tips, 

 and are faintly cephalated by expansion. Their proximal extremities appear to 

 lie dorsad from the body-axis. The frail, simple, arcuate, slender accessory piece 

 lies parallel to, and is two-fifths as long as, the spicula. There is a single supple- 

 mentary organ opposite the posterior part of the spicula. The internal part is 

 refractive and more or less irregularly cylindrical, and bent back parallel to the 

 ventral surface. It is one-half as long as the body is wide, and one-fourth to 

 one-fifth as wide as long, and is probably protrusile through the small, short, 

 cylindrical element at the ventral surface, where there is also a single, strongly 

 curved seta, of considerable size. The ejaculatory duct is one-third as wide as 

 the body. The testes are characterized by the presence of numerous, elongated 

 elements, which constitute one phase in the development of the sperm. These 

 elements are apparently two-thirds as long as the body is wide and one-fifth to 

 one-eighth as wide as long, and are rounded at the end. From the living nema. 

 Habitat: Sand, Nobsca Beach, Woods Hole, below low tide. Fig. 63. 



VH. Order Synodontia 



.8 12.7 20.2 "'58 93.6 



Chambersiellarodensn.sp.i-9 }./ 3j 5.7 3.1 



radictr Only the external walls of the six odontia 

 are cutinized and this portion, but not the 

 interior, stains very strongly in acid-car- 

 * mine. The odontia are used to nibble the 

 mycelium of the fungi constituting the food. 

 cut The cells of the vas deferens are packed with 

 transparent, homogeneous, ellipsoidal gran- 

 ules, whose maximum diameter is about one- 

 third as great as that of the spermatozoa; the 

 cells of the ejaculatory duct are packed with 

 similar granules having about half as great a 

 diameter. The junction of the ejaculatory 

 duct and the vas deferens is distinctly marked 

 set hi by the change in the size of the granules con- 

 tained in these cells composing their walls. 

 The lateral pores on the tail of Chambersiella 



\- w rodens connect with elongated, clavate cells 



\\ located opposite the anus in a lateral position. 

 \\ The nuclei of these cells usually lie a trifle 

 X2000 behind the anal region. From the elevated 

 KM-nore and conspicuous vulva, the somewhat cutin- 

 cfearly the mandibles and the setae. ized large vagina leads inward and obliquely 



forward. The eggs are elongated, apparently more or less long and slender. 

 The gently tapering ovary contains 50-100 ova; reflexed to near anus. 



team 



cirtiM 



set Ib 



