320 ORDER ANAXONCHTA 



bristles very difficult to see. Onchium capable of being protruded past the lips. 

 Opposite the onchium is a pseudo-onchium, somewhat smaller, and more dis- 

 tinctly visible in some attitudes of the pharynx than in others. Amphids exceed- 

 ingly inconspicuous, nearly circular, a little the wider transversely, apparently 

 circular but really consisting of spirals of one wind slightly open behind. At 

 the nerve-ring, the oesophagus is three-fifths, just in front of the cardiac bulb 

 one-half, and finally five-sixths, as wide as the base of the neck. This latter 

 measurement is that of the elongated, ellipsoidal cardiac bulb. The rather 

 prominent, apparently corrugated lining of the oesophagus is distinctly visible. 



sefMfSfi.9 6.6 u.9 -46.6- , The musculature 



> 1.2,, becomes coarse near 



the cardiac bulb. 



7.2 M.7 "-M 91.6 ^ ^ ^ There is a transverse 

 z.4/ 2^s_ . 2.5 -fNM division of the muscu- 



lature of the .cardiac bulb near the middle. The 

 wall of the intestine is of variable thickness; the 

 lumen is distinct. Gradually the intestine becomes 

 two-thirds to three-fourths as wide as the body ; its 

 spa ^rncoe^ nd'. * 750 cross-section would present five to six cells. Often 



the lumen of the intestine presents the appearance of having certain cells bulging 

 inward. Cardiac collum one-sixth as wide as the neck. From the more or 

 less elevated anus, the cutinized rectum extends inward for a distance five- 

 sixths as great as the body-diameter. From the anus, the tail is conoid to the 

 rather blunt terminus. The long, simple spinneret is in its basal part one- 

 third as wide as the base of the tail. The broadly saccate caudal glands form 

 a loose tandem behind the anus in the anterior half of the tail; they empty 

 through separate ducts and ampullae, the latter elongated. The lateral fields 

 are one-third to two-fifths as wide as the body. The ellipsoidal, non-granular 

 renette cell lies close behind the neck, and is two-thirds as long as the body 

 is wide and two-thirds as wide as long. The ampulla is one-third as long as 

 the neck is wide, and three-fourths as wide as long. The nerve-ring is accom- 

 panied by obscure nerve cells. From the small, inconspicuous, rather contin- 

 uous vulva, the small tubular vagina extends inward one-third the distance across 

 the body. Its inner wall is cutinized, so that its rectangular furcation is plainly 

 to be seen. The ellipsoidal eggs are one and one-half times as long as the body 

 is wide and appear to begin segmentation before being deposited. One or two 

 at a time occur in the uteri, which are five times as long as the body is wide. 

 The somewhat narrow, tapering ovaries contain about a dozen ova arranged 

 single file for the most part, but irregularly near the blind end. The faint, 

 acute, tapering, stoutish spicula are colorless and one and one-half times as long 

 as the anal body-diameter. They are so located that their proximal ends appear 

 to be opposite the body-axis. The simple, strong, separate accessory pieces 

 are somewhat slender. They are yellow and quite as conspicuous as the spic- 

 ula. Their applied parts are two-thirds as long as the spicula, from which they 

 recede a little. Their proximal ends appear to lie dorsad from the body-axis. 

 The six, very small and inconspicuous, equidistant supplementary organs occupy 

 a distance somewhat less than the length of the tail. The last is opposite the 

 proximal parts of the spicula. The spaces between them are about equal to 

 half the body-diameter. They hardly disturb the ventral contour of the body. 

 Possibly there is also one near the anus. They are papilloid and have but slight 

 elevation. The ejaculatory duct is one-half, the vas deferens one-half, and 



