FREE-LIVING NEMATODES 27 



setae, occur one in front of the other on each sub-median line, at a distance from 

 the head end equal to one and one-fourth times the head width. The cervical 

 setae, more numerous on the anterior part of the neck/ are sometimes longer than 

 the cephalic setae. The lips, otherwise typical, have successive rings of elements 

 surrounding the interior of the vestibule. The oesophagus is one-third as wide as 

 the neck, but swells posteriorly into a true cardiac bulb, containing a fusiform 

 valve one-third as wide as itself. The intestinal granules are scarce and colorless. 

 The elongated caudal glands are arranged in a close tandem, and have distinct 

 ducts. The renette cell, three times as long as the body is wide, empties through 

 a very inconspicuous pore at the base of the lips. Strongly staining, elongated, 

 distinctly granular bodies are found in the lateral fields behind the neck. They 

 are one-half as long as the body is wide, and two-thirds as wide as long, and they 

 occur as rightsand lefts, i. e. are paired. The first pair is one body-width behind 

 the neck, and the successive pairs, continuing to the anus, are separated from 

 each other by a distance three times as great as the radius of the body. 



The tail of the male is a little stouter than that of his mate. The uniform, 

 slender, frail spicula are as long as the anal body diameter, and one-twelfth as 

 wide as long. There are two strong grooved accessory pieces, twice as wide as 

 the spicula, bearing excessively minute teeth at their blunt distal ends. There 

 are at least five unicellular clavate glands on the dorsal side, extending in front 

 of the anus for a distance equal to the length of the tail. First, anteriorly there 

 is a pair, then a second pair, then apparently a single one, all with slender ducts 

 They were not very well seen, and this enumeration may not be exact. 



Habitat; remarks. Cape Royds; Bay, Cape Royds. Numerous specimens, 

 somewhat shrunken. 



20. Euchromadora antarctica, n. sp. The cuticle is traversed by about 550 

 transverse striae, resolvable into dots near the head, and into basketwork-like 

 markings on the neck and else- 

 where. These striae are of such 

 a size as to give rise to an 

 obscurely crenate contour line. 

 There is a simple, very obscure 

 cardiac valve, one-third as 

 wide as the base of the oesophagus. The cells of the intestine contain numerous 

 rather small, colorless, uniform granules. The ellipsoidal caudal glands are ar- 

 ranged in a loose tandem, and empty through very narrow ducts. The renette 

 cell is about as long as the body is wide, and one-third as wide as long, and presses 

 the intestine somewhat to one side. The nerve-cells around the oesophagus are 

 of a distinct character, but are scattered so as to exhibit no very systematic 

 arrangement. The prolate to ellipsoidal eggs are considerably longer than the 

 body is wide, and three-fourths as wide as long. They have been seen in the 

 uterus one at a time. The tapering ovaries contain upwards of a dozen ova. 



The slender, uniform spicula have a more or less frail framework, and are about 

 twice as long as the anal body-diameter. They are not cephalated, but the proxi- 

 mal parts are somewhat wider. This wider part lies a little to the ventral side 

 of the body-axis, that is, it appears to do so when the animal is viewed in profile. 

 The single, slender accessory piece has a framework that is more or less frail, 

 and has its proximal end opposite the body-axis. The supplementary organs are 



