310 bulletin: museum of comparative zoology. 



HOLOTHURIOIDEA. 



Thyone anomala? 



Ostergren, 1898. Zool. Anz., 21 p. 110. 



1 specimen, about 75 mm. long by 13 in diameter. Sagami Bay (35° 3' N. x 

 13S° 47' E.), Japan, 110 fathoms. Owston collection. 



The specimen is contracted, and having been preserved in formalin, the calca- 

 reous particles in the skin are entirely wanting, except a few perforated and 

 somewhat corroded plates in the tentacles. The general anatomy agrees well 

 with anomala, except that I found only a single stone-canal. Of course, with- 

 out the calcareous particles of the skin, actual identification of a Thyone is 

 impossible. 



Holothuria monacaria? 

 Lesson, 1830. Cent. Zool., p. 225. 



1 specimen, about 140 mm. long. Okinose, Sagami Bay, Japan. Owston 

 collection. 



This specimen is also strongly contracted, and the outer layer of calcareous 

 particles appears to be nearly all dissolved; at least tables are very rare, while 

 buttons with three pairs of holes are exceedingly common. The general appear- 

 ance of the animal is very much like a Stichopus, for there is a series of large 

 warts along each side and others are scattered over the back, while the ventral 

 surface is thickly covered with pedicels. The deposits, however, seem to agree 

 perfectly in form with those of monacaria, and I therefore refer the specimen to 

 that species, although its condition is such as to leave room for doubt. 



Molpadia rosacea, sp. nov. 



Body stout, 100 mm. long by about 50 mm. in diameter; oral disc 15 mm. in 

 diameter ; caudal appendage very small, only 5 mm. long, and apparently without 

 any anal papillae. Skin thin and smooth. Tentacles fifteen, of uniform size ; each 

 one is about 4 mm. long and 1 mm. in diameter ; nearly a millimeter from the 

 tip on each side is a very slender digit only a quarter of a millimeter long ; no 

 other digits are present. No evident genital papilla. Calcareous ring not very 

 stout ; radial projections posteriorly rather small and delicate. Polian vessel 

 single. Stone-canal single, spirally wound in dorsal mesentery. Respiratory- 

 trees well developed but slender ; right one extending forward so far as to lie 

 against calcareous ring. Calcareous deposits in body wall very scarce, consisting 

 of irregular perforated plates, which have the appearance of having been discs of 

 small tables ; they are only 80-100/* across and have from two to six holes ; most 

 of them are colored and apparently becoming transformed into phosphatic bodies ; 

 these latter are exceedingly abundant but extraordinarily small, scarcely any ex- 

 ceeding 40/n iu diameter; they are arranged iu small groups which appear as 



