no. 2073. HOLOTHURIANS FROM NORTHWEST PACIFIC— OHSHIMA. 269 



holes which are larger towards the periphery; no other supporting 

 bodies are present. Stone-canal not very short, as stated by Augustin, 

 measuring 5 mm. in length, with kidney-shaped madreporite. 



Both Th. venusta Selenka and Th. villosa Semper are very closely 

 allied to the present species. It would not be surprising if later 

 examinations should prove these forms to be one and the same 

 species. 



Habitat. — Uraga Channel and Sagami Bay (Augustin, 1908); 

 Suruga Bay. 



71. THYONE PUNCTATA, new species. 



Station 4936. One specimen. 



Body more or less quadrangular, with both anterior and posterior 

 ends bent dorsad. Length, 28 mm. ; diameter, 6 mm. Color whitish, 

 punctate with brownish pedicels, tentacles dark gray. Integument 

 thick and stiff, rough to the touch, except on the well-marked intro- 

 vert, which is quite soft. Tentacles 10, of which the 2 ventral are 

 very small. Pedicels minute and retractile, uniformly scattered all 

 over the body except in the posterior three-fourths of the ventrum, 

 where they are confined to the 3 ambulacra, forming dense double 

 rows. Introvert free from pedicels. The integument is stiffened 

 with thickly crowded buttons similar in form to those found in Th. 

 similis Ludwig. 1 Length of the disk ranges 135-210/i, averaging 

 about 165/1. In the deeper parts are found larger ones with the 

 diameter of 260/x and with over 10 holes. In the introvert these 

 are modified into smaller knobbed plates, 90-180/* in diameter, with 

 5-16 holes. Pedicels are supported by bent modified tables, 140/i 

 long, with 4 holes at the middle and 1 at each dilated end. Sup- 

 porting rods of tentacles are smooth, with several holes at each end. 

 Anal teeth present. Calcareous ring well developed, with long pos- 

 terior prolongations. Polian vesicle single. Respiratory trees two. 

 Genital tubes unbranched. 



From Th. sacellus (Selenka) which is also known from the coasts of 

 Kyushu, the present species differs in size and shape of deposits and 

 in the number of Polian vesicles. Th. belli and Th. similis, both 

 described by Ludwig, are very close to the present species, especially 

 the former in distribution of pedicels. But greater size of the button- 

 shaped deposits distinguishes above all the new species. 



Habitat. — Off Cape Sata, south of Kyushu. 



Type.— Cat. No. 34171, U.S.N.M. 



72. THYONE PARVA, new species. 

 Plate 10, fig. 23. 



Station 5046 or 5047. One specimen. 

 Body plump, spindle-shaped, 9 mm. long and 5 mm. thick, with 

 mouth and anus turned dorsad, more or less resembling Sphserothuria. 



i See Ludwig, Vettor Pisani Holothurien, 1887, pi. 2, figs. 7 A', A". 



