no. 2073. HOLOTHURIANS FROM NORTHWEST PACIFIC— OH SHI MA. 263 



62. CUCUMARIA SLUITERI, new species. 

 Plate 10, figs. 21a, b. 



Station 5079. One specimen of doubtful specific identity. 

 Station 5082 or 5083. Two specimens. 



Body elongated oval, 11 mm. in length and 5 mm. in diameter, 

 with mouth and anus terminal. Color gray, integument thin and 

 translucent. Tentacles 10, all equal in size. Pedicels are arranged 

 in a row along each ambulacrum, each row consisting of 10 pedicels 

 in trivium and of 3 or 4 in bivium. Scattered in dorsal perisome 

 are found X-shaped, tablelike deposits (pi. 10, figs. 21a, b). The 

 arms may number up to 7, and the ends are dilated and perforated. 

 Spire is solid, situated on one of the arms near its base, and bears 

 irregular teeth. Diameter of base ranges 210-380/*, with a mean of 

 300/*; height of spire commonly 150/*. Near the introvert these 

 tables become plumper, and the spire is replaced by an arm arising 

 obliquely from the basal plane, exactly as in C. abyssorum. 1 The 

 introvert as well as the greater part of ventrum are devoid of spicules. 

 Pedicels are supported with bent rods, 300/* long, with a thick branch 

 given out from the middle. End plate single, rather weakly devel- 

 oped. Supporting rods of tentacles are similar to those of pedicels. 

 No anal teeth can be made out. Calcareous ring fragile, without 

 posterior prolongations. Eetractors very slender, inserted to body 

 wall at one-third of body length from the anterior end. Polian 

 vesicle single. Genital tubes thick and short, unbranched. 



This interesting species stands very close to C. abyssorum, in which, 

 however, those delicate X-shaped tables are not present. O. nocturna 

 Sluiter is also a close ally to this species, but differs in the tentacles 

 being not all of uniform size and the dorsal pedicels being long and 

 stiff, and in some characters of deposits. I take pleasure in naming 

 this species for Prof. C. Ph. Sluiter, of the University of Amsterdam. 



With much hesitation I refer a specimen from station 5079 to this 

 species. All calcareous bodies are dissolved, only leaving rods 75- 

 130/* long, with bifurcated ends. Each of these bodies supports a 

 conical papilla, 40-160/* long, scattered all over the body. Probably 

 these are the remnants of the spires of those X-shaped tables. 



Habitat. — South of Totomi, Honshu. 



Type.— Cat. No. 34168, U.S.N.M. 



63. CUCUMARIA CONSTRICTA, new species. 



Plate 10, figs. 22a, 6. 

 Station 4880. One specimen. 

 Station 4903. One specimen. 

 Body strongly curved, with the large introvert protruded from the 

 constricted anterior end. Length about 23 mm., diameter about 



1 See Theel, Challenger Holothurioidea, pt. 2, 1886, p. 67, pi. 4, fig. 6b. 



