no. 2073. HOLOTHURIANS FROM NORTHWEST PACIFIC— OHSHIMA. 283 



smaller than the others. Pedicels form 2 rows along the margin of 

 sole, the inner row being very conspicuous, consisting of larger pedi- 

 cels arranged alternately. The odd ambulacrum has at both ends 

 some pedicels arranged in a double row, while in the middle part only 

 a very few, weakly developed ones are present. Dorsal pedicels 

 very minute, 80-150/1 in diameter. Deposits of sole are heavy, 

 knobbed plates, often overlapping one another (pi. 11, fig. 33). 

 They range 90-260/* in diameter, with a mean of about 150/*; holes 

 usually 8 or 9 in number, varying 1-33. Diameter of holes averages 

 20/*, ranging 7-38/*. Pedicels and tentacles with numerous arched 

 plates without knobs. End plate of ventral pedicels 270-300/* in 

 diameter. In dorsal pedicels are found rudimentary end plate and 

 supporting plates. Dorsal scales are rather uniform in size, up to 

 1.2 mm. in diameter, imbricating, with large granules measuring 

 150-200/* across. There are about 17 scales between the mouth and 

 the anus, 25 in a transverse line where the body is widest, 7 in front 

 of mouth, and 9 behind anus. No enlarged or regularly arranged 

 scales around the mouth and anus. Dorsal pedicels mostly passing 

 through a pore or pores in a scale, there being often three or more 

 of these pores in a single scale. Calcareous ring with no posterior 

 prolongations. Polian vesicle and stone-canal single. Genital tubes 

 unbranched. Respiratory trees two, tolerably developed. 



Ps. disjunction Sluiter differs from this species in the shape of its 

 deposits in the sole and the distribution of its dorsal pedicels. Ps. 

 rugosum Koshler and Vaney is also closely related to the present 

 species, but differs by the greater number of its scales, a richer devel- 

 opment of the granules on the latter, and the smaller number of its 

 mid ventral pedicels. 



Habitat. — Aleutian Islands. 



Type.— Cat. No. 34184, U.S.N.M. 



Family SYNAPTID^E Burmeister. 



Genus PROTANKYRA Ostergren. 



89. PROTANKYRA KAGOSHIMENSIS, new species. 



Plate 11, figs. 34a-c. 



Station 4945. Nine fragments. 

 Length over 125 mm., diameter up to 15 mm. Color reddish-brown 

 with a tinge of green. Integument transversely wrinkled, sticky from 

 the presence of large anchors. Tentacles 12, each with 2 pairs of 

 digits, of which the terminal ones are larger. The anchor (pi. 11, fig. 

 34a) is large and slender, with the stock divided in the shape of a T, 

 its surface being finely serrulate. The top is smooth, but each arm 

 has on its middle part about a dozen teeth. Length of anchors ranges 



