330 ORDER ANAXONCHIA 



somewhat similar to that of the pharynx. The amphids, difficult to observe, 

 have a somewhat elongated, inward, refractive extension, as shown in the illus- 

 tration. Eye-spots colorless or slightly yellow. There are rather inconspicu- 

 ous collections of golden brown pigment granules in the anterior portion of the 

 oesophagus. This latter continues with much the same diameter for some dis- 

 tance, but gradually enlarges. After it passes through the nerve-ring it is two- 

 fifths as wide a's the corresponding portion of the neck, and it finally becomes 

 three-fifths as wide as the base of the neck. Its radial musculature is very 

 strongly marked in the posterior half, reminding one to some extent of the oesoph- 

 agus in Bolbella. The nerve cells both before and behind the nerve-ring are an 

 unusually prominent feature. A little more than half way from the head to the 

 nerve-ring the foremost of these cells occur as two lateral ellipsoidal granular 

 cells half as wide as long, and having a length one-third as great as the corre- 

 sponding width of the neck. Almost on a level with these is a ventral cell, and 

 immediately behind them are other lateral cells of somewhat smaller size, and 

 thence onward the neck is packed with cells of the same character, which gradu- 

 ally become globular and continue behind the nerve-ring and cease about half 

 way between the nerve-ring and the cardia. There is a collection of similar cells 

 in front of and behind the anus. The cardia is convex-conoid and about one- 

 third as wide as the corresponding portion of the body. The intestine becomes 

 at once about two- to three-fifths as wide as the body. The anus is almost 

 continuous, though the posterior lip is very slightly raised. The refractive, 

 narrow rectum is about one and one-half times as long as the anal body-diameter. 

 The tail begins to taper from a little in front of the anus, and tapers at much the 

 same rate behind the anus, in such a fashion that at its middle the diameter is 

 about one-third as great as at its base; thence onward, it tapers but little and 

 ends in a terminus about one-fourth as wide as its base. Caudal glands appear 

 to be located in the base of the tail. The renette cell is located just behind the 

 base of the neck. The lateral fields appear to be about one-half as wide as the 

 body, and are characterized by a succession of groups of cells, which are larger 

 than usually seen in these regions. These groups contain dozens of nuclei packed 

 rather closely together. The groups do not seem to be very regularly arranged, 

 but succeed each other with intervals between them that are shorter than the 

 length of the groups. The groups are of rather uneven size, and are most con- 

 spicuous between the neck and the anus. 

 Habitat: Larat, East Indies. Marine. Fig. 109, p. 329. 



.7 5.6 9. S-W. .7 



110. Synonema braziliense n. sp. 1.3 / i.5 ij l - s J - 2 Cuticle naked 



except for the setae at the anterior end. Mouth depressed. Lips subdistinct, 

 flat, rather thin, fairly developed, flap-like; lip-region apparently twelve-ribbed, 

 closing nearly together over the rather small pharynx, which may be reckoned 

 to extend at least a short distance behind the base of the dorsal onchium. The 

 oesophagus near the nerve-ring is one-half, just in front of the cardiac bulb one- 

 half, and finally three-fourths, as wide as the base of the neck. This latter 

 measurement represents the diameter of the valveless, pyriform cardiac bulb. 

 The musculature of the oesophagus is colorless, with no indication of the pres- 

 ence of glands. There is a cylindroid cardia one-third to two-fifths as wide as 

 the base of the neck, and two-thirds as long as the body is wide. The thick-walled 

 intestine, which has a distinct, refractive lining, becomes at once three-fourths 

 as wide as the body, and in cross-section would present about four cells. Cardiac 

 collum one-half as wide as the neck. From the more or less depressed anus, the 



