ORDER ANAXOXCHIA 



anus. The twenty-five supplements are rather simple and when the body is 

 curved, take on the form of semi-cylindroid, transverse elevations, the distance 

 between them increasing anteriorly. There are two opposite the spicula and a 

 third a short distance in front of the proximal ends of the spicula; and then for 

 a distance equal to four times the length of the tail, the organs are separated by 

 spaces not greater than their own width. Thence forward, the organs are sepa- 

 rated by wider spaces, and occasionally one of the series appears to be missing. 

 The two anterior ones are separated by a distance about twice as great as the 

 width of one of the organs. The entire series occupies a distance about eight 

 times as long as the tail. No special papillae or setae have been seen on the 

 tail end, either in front of the anus or behind it. The proximal ends of the strongly 

 arcuate, slender-looking spicula appear to lie nearly opposite the body-axis. 

 Apparently connecting the cephalic expansions with the anus are slightly curved, 

 refractive lines, indicating that the spicula may be broader than would appear 

 from an examination of only the more striking portions of the framework. Acces- 

 sories parallel to, and two-fifths as long as the spicula. Ejaculatory duct one- 

 third as wide as the body. The blind end of the testis is about half as wide as 

 the body. 



Habitat: Mud, tide pool, Portsmouth, N. H., U. S. A., near low tide mark. 

 This genus resembles Onyx. Fig. 105, p. 325. 



106. Polysigma uniforme n. sp. Cuticle, if striated at all, very finely so. 

 Body naked except for the setae on the head. Lips minute, more or less conflu- 

 ent, relatively thick, six and double, or possibly twelve. Near the nerve-ring 

 and just in front of the cardiac bulb, the oesophagus is one-half, and finally 

 three-fourths, as wide as the corresponding portion of the neck, this latter figure 

 being the measurement of the pyriform cardiac bulb. The refractive lining is 

 one-twentieth as wide as the oesophagus. In the posterior half of the oesoph- 



agus, there are pigment granules in 

 the fine-textured musculature. The 

 two elongated masses of brown pig- 

 ment granules begin suddenly at the 

 middle of the cardiac bulb and end 

 suddenly near the middle of the neck. 

 There are quite prominent, pigmented 

 submedian glands in the oseophagus, 

 but apparently no dorsal one. The 

 thick-walled intestine, which has a 

 faint lumen, becomes at once half as 

 wide as the body, and in cross-section 

 would present three to four cells. 

 Very minute, but distinct, yellowish 

 granules of uniform size are scattered 

 in the intestinal cells. The cardiac 

 collum is two-fifths as wide as the 

 X 750 neck. The medium-sized nerve-ring 

 is accompanied by distinct nerve cells, not very definitely grouped. From the 

 more or less elevated vulva, the fairly-well cutinized vagina extends inward half 



