no. 2073. HOLOTHURIANS FROM NORTHWEST PACIFIC— OHSHIMA. 275 



arranged at both ends. Anal teeth 5, in the shape of simple per- 

 forated plates. Calcareous ring without posterior prolongations, 

 wavy in the posterior margin. The radial segment has two unequal 

 incisions on its broader anterior margin, besides the deep, median 

 notch. Interradials triangular in shape. Retractors inserted at 

 about two-fifths the body length. Polian vesicles 2, stone-canal 1. 

 Respiratory trees 2, opening into a long cloaca at its beginning. 

 Genital tubes branched once or twice, in 2 tufts. 



Ps. discrepans (Sluiter), the only 15-tentacled stichopoda hitherto 

 known, differs from the present species in having tables with a 4- 

 pillared spire and calcareous ring with posterior prolongations. 



Habitat. — Sagami Sea. 



Type.— Cut. No. 34177, U.S.N.M. 



. 78. PSEUDOCUCUMIS TABULATUS, new species. 

 Plate 10, figs. 27 a-c. 



Station 4900. Two specimens. . 



Station 4904. One specimen. 

 Body fusiform and curved. Length, as measured along ventral 

 median line, 26 mm.; along dorsal, 18 mm.; diameter, 8 mm. Color 

 dirty grayish-brown; integument thin and stiff, rough to the touch. 

 Tentacles 20, 5 very minute, radial in position, the other 15 appar- 

 ently of uniform size. Pedicels nonretractile, arranged sparsely in 

 2 rows in each ambulacrum, numbering above 40 in trivium, and 

 less than 30 in bivium. Three dorsal interambulacra have in their 

 middle region a very few scattered pedicels. Deposits of general 

 perisome are robust tables uniformly distributed (pi. 10, figs. 27a-c). 

 Disk almost round, 90-185/z in diameter, mean about 145//, perforated 

 with small holes numbering 8-22, most commonly 12 or 13. Central 

 hole very large, covered with an arched cross, on each arm of which 

 stands a robust pillar forming together a conical spire. The pillars 

 number usually 4, but may often increase up .to 7. The spire is about 

 67/* high, armed with a number of minute teeth (figs. 27a, b). The 

 central hole of the disk is also covered over on the under side by an 

 irregularly branched arch (figs. 27b, c). Tables of smaller size quite 

 regular in shape, with a 4-pillared spire and 8 large peripheral holes 

 arranged in a circle. Deposits of the introvert are scattered, elon- 

 gated plates with many holes and serrated margin, measuring 30- 

 150 pi in length. Anus surrounded by 5 anal teeth. Pedicels richly 

 beset with modified tables with elongated disk and 4-pillared, toothed 

 spire; length of tables, 97-180/*. End plate well developed, meas- 

 uring 175-225/* in diameter. Supporting rods of tentacles smooth 

 and curved, with several minute holes at the slightly expanded ends. 

 Calcareous ring made up of 10 segments, each with a deep posterior 

 notch, but without posterior prolongations. Retractors inserted 



