m 2073. HOLOTHURIANS FROM NORTHWEST PACIFIC— OHSHIMA. 225 



the male, the mouth is closed by a circular fold of skin, forming, so 

 to speak, a buccal cavity. Many eggs were found attached to the 

 tentacles which were withdrawn into this cavity. The eggs meas- 

 ured 0.9-1 mm. in diameter. 



Habitat — Faroe Channel (TMel, 1882); Bay of Biscay (Koshler, 

 1895); west coast of Morocco, Sahara, and Senegal (Perrier, 1902); 

 Bergen (Ostergren, 1896); Hardangerfjorden (Grieg, 1913); Sagami 

 Sea (Mitsukuri, 1912); southwest of Shikoku; off Kii, Honshu. 



8. BATHYPLOTES OSTERGRENI, new species. 

 Plate 8, figs. 3a-d. 



Station 4893. One specimen. 



Station 4903. One specimen. 

 Body elongated, subcylindrical, only 21 mm. long and 4 mm. 

 broad. Mouth subventral, anus terminal. Color dirty greenish- 

 white. Integument smooth to the touch, with thick gelatinous 

 subcutaneous tissue. Tentacles yellowish, only 19 in number, nor- 

 mal number probably 20. Pedicels none in the odd ambulacrum, 

 in two rows in each ventrolateral ambulacrum. Papillae forming 6 

 rows on dorsum. Besides these there are " fungiform papillae," 

 0.5-0.7 mm. in diameter, scattered along the sides of body. All 

 these three kinds of appendages are very contractile and not promi- 

 nent. Quadriradiate tablelike deposits are scattered in all parts 

 of the perisome. In dorsum the deposit has 4 arms, which are ex- 

 panded and perforated at end, and four-pillared spire with one or 

 two cross-beams and some teeth on the top and sides. Diameter 

 of base varies between 55 and 87/*, with a mean of about 70/*, and 

 height of spire 33-47/*. At the base of papillae they are very large, 

 with a diameter of as much as 143/*, and a spire 70/* high, with three 

 cross-beams (pi. 8, figs. 3a, b). In walls of papillae are found similar 

 deposits with much reduced base and tall spire. Deposits of ventrum 

 are very small and sparse; base usually disklike, pierced by four 

 large holes; spire with one cross-beam (figs. 3c, d); diameter of base 

 varies from 25 to 57/*, with a mean of 34/*, height of spire 20-23/j.. 

 Tables in pedicels with many holes in disk, nearly equal in size to 

 those of ventral perisome. Bent supporting rods armed with low 

 spines are also found in pedicels and papillae. Tip of pedicels with 

 well developed end plate, 200-300/* in diameter; papillae with a 

 cluster of irregular branched rods in tip. "Fungiform papillae" 

 usually without spicules, but sometimes with a branched rod instead 

 of the end plate. Supporting rods of tentacles with more pro- 

 nounced spines than in those of pedicels and papillae. Kadial seg- 

 ment of calcareous ring thick, H-shaped; interradials rodlike. 

 Polian vesicles two in one of the specimens, one in the other. Stonc- 



59758°— Proc.N.M.voL.48— 14 15 



