286 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 48. 



wheels 50-1 05/z, with a mean of 82//. Polian vesicles 7 in one specimen. 

 Genital tubes once or twice branched. Ciliated funnels especially 

 numerous in the left dorsal interambulacrum. 



It is with much hesitation that I refer the specimens to this species, 

 depending mainly on the fact that they are from the shores of Aleutian 

 Islands, which are known as its home. Compared with the specimens 

 of Cfh. Ixvis (Fabricius) from Eastport, Maine, the specimens before 

 me differ in the absence of branched rods from the tentacles. 



Habitat.— See Clark, 1907, pages 27, 120. 



Genus T^INIOGYRUS Semper. 



93. TiENIOGYRUS CIDARIDIS, new species. 



Station 4900. Nine specimens. 



Body irregularly distorted, measuring at most 30 mm. long and 3.5 

 mm. in diameter. Two of them were found attached to a disk-bearing 

 spine of Cidaris (Goniocidaris) clypeata Doderlein by their coiled 

 posterior parts. Color white, skin rough to the touch. Tentacles 10, 

 with 4-5 pairs of digits. Wheel-papillae numerous on the dorsal side, 

 probably totally absent from the ventral interambulacra except in 

 the anterior part. Wheels are of the ordinary shape, measuring 

 30-135/1 in diameter, increasing in size towards periphery of the 

 papilla. Hooks 120-185/i long, 154/* on an average, not gathered 

 into hook-papillae, but scattered in the perisome and more numerous 

 in the ventrum than in the dorsum. Supporting rods of tentacles are 

 smooth, slightly thickened at the middle part, and with short bifurca- 

 tions at each end. Calcareous ring composed of 10 segments. Polian 

 vesicle and stone-canal single. Genital tubes once or twice branched. 

 Ciliated funnels could not be made out. 



Though resembling T. contortus (Ludwig) in many respects, this 

 species differs by the number of its tentacles and Polian vesicles. 

 From both T. australianus (Stimpson) and Trochodota dunedinensis 

 (Parker) it differs by the distribution of its deposits. T. aUani Joshua 

 differs from it in having much larger wheels and in the shape of its 

 tentacle rods. 



Habitat. — Off Goto Islands, west of Kyushu. 



Type.— Cat. No. 34186, U.S.N.M. 



Genus TOXODORA Verrill. 



94. TOXODORA PACIFICA, new species. 



Plate 11, fig. 35. 



Station 5073. One complete specimen and three fragments. 

 Body cylindrical and long, 145 mm. in length and 14 mm. in diam- 

 eter. Color purplish-gray all over, but very light in distended parts, 

 where the body wall is thin and translucent. Tentacles 12 in number, 

 each provided at the top with 3 pairs of digits of equal size. Deposits 

 of only one kind, in the shape of parentheses, often with a little knot 



