24 ANTARCTIC MARINE 



16. Spilophora edentata, n. sp. Striae about 600, producing a crenate contour, 

 interrupted by the two lateral wings which are so formed as to appear somewhat 



like the keel and ribs of a 

 boat. Four sub-cephalic 

 setae occur opposite the base 



Pi 7rT : - \-f ^-J^Lzk. 1 ^ 7 ---* 5 . 6 -- 8 !'- f the phar > rnx - There are 



gp .J^:j--.-Y i.~6~~3.2~r 3^3 3.~3 ~ 2 .e 1<anp f e w subme dian somatic 



setae, each about one-third 



as long as the body is wide. There appears to be no distinct dorsal pharyngeal 

 tooth, but possibly an exceedingly minute more or less ventral one, unless indeed 

 this appearance be due to the optical effect of one of the striae that exist separately 

 in the posterior part of the pharynx. The masculature of the bulb is broken into 

 two very unequal parts. The rather thin-walled intestine becomes at once two- 

 thirds as wide as the body and is about six cells in girth. The cells contain numer- 

 ous very small, uniform colorless granules. The cylindrical part of the tail of the 

 female is about one-fourth as wide as the base. The broadly saccate caudal glands 

 are arranged in a loose tandem in the anterior half of the tail, and are connected 

 with the spinneret by distinct but very narrow ducts with no clearly visible am- 

 pullae. The lateral fields, one-third as wide as the body, contain small scattered 

 nuclei, as well as others less numerous and twice as large. The granular ellipsoidal 

 renette cell, which presses the intestine to one side, a little behind the neck, is 

 about half as long as the body is wide, and one half as wide as long. The duct is 

 hardly half as wide as one of the annules, and the ampulla, opposite the base of 

 the pharynx is almost invisible. The excretory pore is at the lips. The nerve cells 

 are arranged in rather indistinct groups, better seen behind the ring. 



The male tail appears to be more nearly conoid throughout, and has a spinneret 

 only about one-eighth as wide as its base. The tapering spicula in their widest 

 part are one-sixth as wide as the corresponding part of the body, and are cephal- 

 ated by a very inconspicupous constriction. The accessory pieces are slender and 

 rather frail. The testis is about half as wide as the body. Rather distinct, well 

 spaced, oblique copulatory muscles are present in front of the anus for a distance 

 equal to one and one-half tail-lengths. Apparently pairs of male glands, emptying 

 into the cloaca, are present as in Euchromadora and Chromadora, but the details 

 remain unknown. 



Habitat; remarks. Bay, Cape Royds. A single female and four males, all in 

 fair condition. 



17. Spilophora antarctica, n. sp. Striae about 400, producing a somewhat 

 crenate contour, and interrupted by two lateral wings separated by a distance 



equal to one-fifth the body dia- 



44 ? 4 77. meter. Cervical setae occur at 



3.2 2. ' 5na> least near the head. The cardiac 

 56 valve is simple in structure. The 



"*" 8 : > .SDD. relatively somewhat thick-walled 

 3-3 2 ' 6 intestine soon becomes two-thirds 



as wide as the body, and is about 



two cells in girth, these latter containing scattered, rather uniform, colorless 

 granules. The posterior lip of the anus is more or less elevated. The cylindroid 

 part of the tail is one-fifth as wide as the base, or somewhat less. The renette cell 



