FREE-LIVING NEMATODES 25 



has not been clearly seen, but the intestine is pushed to one side as if a small one 

 were present, a little behind the neck. The nerve-cells extend past the base of 

 the neck, especially on the ventral side. The eggs occur one at a time in either 

 uterus. The rather broad, tapering ovaries, which extend two-thirds of the way 

 back to the vulva, contain few ova, arranged single file. The testis is one-half to 

 three-fifths as wide as the body. 



Habitat; remarks. Cape Royds; Bay, Cape Royds. Six females and three 

 males, in a somewhat shrunken state. 



18. Spilophora serrata, n. sp. Striae about 500, interrupted by the lateral 

 wings, which occupy a space equal to one-fourth the body diameter. The second- 

 ary elements of the cuticle j, ^ 



appear as dots on the head, pp ; ^0J!^\\ ?/u i-_ E _ : Ji'J_'_ 4 i' ^l*. 5 , 



and produce a punctate lffi '."'-|^v-' - 1>5 2>6 ; 2 ^1 3 - 4 2 - 5 

 appearance there. Four l'.-f^\ j K 1P . 8 .i7.i - H E9 86. 

 rather irregular pairs of sub- sp 'jjlJE&Jfj l ~ E 2 V : ~ J V ~ 3 ~7 iT ' 9 "' 

 cephalic setae, like the ceph- 

 alic setae, but shorter, mated one in front of the other, occur at a distance from 

 the lips equal to twice the width of the head. There are few cervical setae. The 

 vestibule of the pharynx is longitudinally striated. This is one of the few 

 species of Spilophora in which the amphids can be plainly seen. The rather thick- 

 walled intestine soon becomes three-fourths as wide as the body, and is ten to 

 twelve cells in girth, the cells containing numerous uniform, colorless granules 

 nearly equal in diameter to the width of one of the annules of the cuticle. The 

 posterior lip of the anus is elevated. The terminus of the tail is about one-sixth 

 as wide as its base. The two broadly saccate caudal glands are arranged in close 

 tandem opposite the anus and in the anterior fourth of the tail. Their ampullae 

 are not distinct. The third caudal gland (?), just behind the anus, is a strongly 

 staining cell, with a duct, or connection, that reaches to near the terminus. The 

 non-granular renette cell, one body-width behind the neck, twice as long as the 

 body is wide, has a small companion-cell in its rear. The excretory pore is probab- 

 ly near the lips. Opposite the renette cell there are two, and probably three, 

 ellipsoidal cells in each lateral field, each cell being one-third as long as the body 

 is wide, and one-third as wide as long. These cells constitute two pairs, or three. 

 The eggs are about one and one-half times as long as the body is wide, and two 

 thirds as wide as long, and occur in the uteri one at a time. Each of the medium 

 sized, tapering ovaries reaches half way back to the vulva, and contains about 

 fifteen ova arranged single file. 



The strong, rather uniform, colorless spicula are cephalated by a constriction 

 and are obliquely truncated at the distal end, where there are two or three exceed- 

 ingly minute teeth. The subslender, rather strong and simple accessory pieces 

 recede a little from the spicula. Of the slightly elevated, somewhat protrudable 

 supplementary organs, whose width is about equal to that of two annules, the 

 hindermost is near the anus. They are farther apart anteriorly, the distance 

 between the first and second equaling one-third of the body width, that between 

 the second and third, one and one-half times the body width. The ejaculatory 

 duct is one-third as wide as the body the vas deferens and testis one-half. At 

 least one pair of glands of the kind seen in the males of Euchromadora occurs nearly 

 twice as far in front of the anus as the terminus is behind it; each gland-cell is 



