22 ANTARCTIC MARINE 



CHROMADORA, Bastian, 1865 



14. Chromadora meridiana, n. sp. Among the secondary elements into which 

 the 600 transverse striae are resolvable there are two longitudinal rows that stand 



Ut al ^ the latfiral fields a 



'.6 8.8^13.8 '46 86. 



.V~3.~3 r r~3Y~5~~~?~2 > ' 9ia ' little more prominently than 



the others. Outside these, on 



on'' : : * B * either side, is another row almost imperceptibly emphasized. 



S P " "-"" The annules are retrorse posteriorly, and the reverse anteriorly, 



the change taking place opposite the vulva on the female. The few very short 

 cervical and somatic setae to be seen scattered here and there are one-half to one- 

 third as long as the body is wide, though a few nearer the head are considerably 

 longer than the cephalic setae. There appear to be twelve subdistinct lips, each 

 bearing a single papilla. The conoid neck contains a cylindroid oesophagus, 

 which, measured at the nerve-ring, is one-third as wide as the corresponding 

 portion of the neck. The oesophagus ends posteriorly in a bulb three-fourths as 

 wide as the base of the neck, containing an inconspicuous elongated valve one- 

 third as wide as itself. The musculature of the bulb is broken into two very 

 unequal parts. There is no cardia. The wall of the intestine varies from thick 

 to somewhat thin, and is six to eight cells in girth. The intestine becomes at once 

 about three-fourths as wide as the body. Its lumen is distinct, and about one- 

 fourth as wide as itself. The rather numerous granules to be seen in the cells of 

 the intestines are uniform and small. From the anus, which is depressed, the 

 chitinized rectum leads inward and forward a distance equal to the length of the 

 anal body-diameter. 



The arcuate tail tapers from in front of the anus, but is usually cylindroid in the 

 posterior fifth, and has a terminus one-sixth as wide as its base. The broadly sac- 

 cate caudal glands are packed together in the anterior fourth of the tail, and empty 

 through distinct narrow ducts. The length of the few, scattered, straight caudal 

 setae is about equal to the width of two annules of the cuticle. The lateral fields 

 are one-third as wide as the body. The granular renette cell, which is somewhat 

 longer than the body is wide, and one fourth as wide as long, is located at a distance 

 from the base of the neck equal to the width of the body, and empties by means of 

 a slender duct, through the excretory pore located at the lips. It has a smaller 

 companion cell in its rear. The nerve-ring surrounds the oesophagus somewhat 

 squarely. The cells in its vicinity are distinct in character, and many of them have 

 narrow connections directed forward. From the obscurely depressed somewhat 

 conspicuous vulva, the small tubular vagina leads inward at right angles to the 

 ventral surface one-third the distance across the body. The eggs are about as 

 long as the body is wide, and usually about three-fourths as wide as long, and have 

 been seen in the uterus one to three at a time. The spermatozoa seen in the females 

 are one-eighth as wide as the body. The tapering ovaries reach about three- 

 fourths the distance back to the vulva, and contain each about fifteen mostly dis- 

 coid ova, arranged more or less single file. 



Habitat; remarks. Bay, Cape Royds. Five females in fair condition. 



15. Chromadora polaris, n. sp. This species closely resembles Chromadora me- 

 ridiana from the same region, but differs in having narrower dimensions, more 



