30 ANTARCTIC MARINE 



radius of the body, and to be about one-half as long as the body is wide, and one- 

 half as wide as long. It empties by means of a short duct, and a rather struc- 

 tureless ampulla half as wide as the oesophagus, through the excretory pore near 

 the nerve-ring. The vulva is more or less continuous, and rather inconspicuous. 

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

 one-third as wide as the body. They have conspicuous nuclei. Of the narrow 

 ovaries the posterior one is only one-third to one-half as long as the anterior, 

 which contains twenty developing ova, arranged single file, while the posterior 

 one contains only about fifteen. 



The slender, uniform spicula have a more or less frail framework. The single 

 accessory piece, also more or less frail, presents,a stoutish, uniform, blunt apoph- 

 ysis one-half as long as the anal body-diameter, arranged at right angles to the 

 part which is applied to the spicula. This latter is one-third as long as the spic- 

 ula. The vas deferens is one-third, the tapering testes about one-half as wide as 

 the body. These latter, however, finally become very narrow. The blind end 

 of the posterior testis lies in front of the anus a distance about equal to six times 

 the length of the tail. 



Habitat; remarks. Bay, Cape Royds; Bay. Four females and two males, 

 slightly shrunken. 



AXOXOLAIMUS, de Man, 1889 



24. Axonolaimus polaris, n. sp. The striae of the thin cuticle are very difficult 

 to resolve and are best seen on and near the tail. One is left in doubt as to whether 



4 9 7 3 Y 94.7 the COnt Ur is P lain > or Vei T mi ' 



' '", i-7r.n. nutely crenate. Apparently there 



are six subcephalic setae, each 



half as long as the diameter of the head measured at the labial 

 CP \ ' \ constriction. Though there are no somatic setae there are a 



few scattered setae on the neck, generally somewhat shorter 

 than the subcephalic setae. The conoid neck contains a conoid oesophagus, 

 whose diameter near the nerve-ring is two-fifths as great as that of the corre- 

 sponding part of the neck, and which finally becomes two-thirds as wide as the 

 base of the neck. There is no distinct cardia. The thick walled intestine is 

 two to three cells in girth, and becomes at once three-fourths as wide as the 

 body, being separated from the oesophagus by a collum three-fifths as wide as 

 the base of the neck. On account of the food contained in it the lumen of the 

 intestine is distinct. The intestinal cells contain very fine, scattered, colorless 

 granules in the middle of which the nucleus appears as a distinct feature in 

 stained specimens. From the raised anus the chitinized rectum extends inward 

 and forward a distance equal to the anal body-diameter. The tail tapers from 

 the anus, bears very minute hairs near the end, and contains broadly saccate 

 caudal glands packed in its anterior third. The nerve-ring surrounds the oesoph- 

 agus squarely, is of medium size, and is accompanied by obscure nerve-cells, 

 which are not very distinctly grouped. 



Habitat; remarks. Bay, Cape Royds. Single young specimen, in fair con- 

 dition. In the sketch the lips are shown partly everted. 



