666 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxii. 



Small disks with no periphei'al holes and with the spire reduced {Id) 

 are not uncommon. All these are found in the same specimen. One 

 or two specimens have the small disks {d) and slight variations of 

 of '■'"Ic/" preponderating, few of '"ftype being present. In these 

 specimens the spines of the disk are nuich more pi'ominent and the 

 spire is frequently rudimentary or inconjplete. There are many but- 

 tons scattered between the circles. Still another specimen has tables 

 of the "Ic/" t3^pe in greatest abundance, ^^1(V much less numerous. 

 There is, however, so much variation in the shape of the tables of a 

 single specimen that nothing can be made of slight diti'erences in the 

 deposits of different specimens. The supporting rods are very charac- 

 teristic, their form l)eing best appreciated by the figures. They vary 

 from about 0.18 to 0.32 mm. in length. The dorsal pedicels have 

 smaller terminal plates than the ventral. 



*HOLOTHURIA INHABILIS Selenka. 



Holothuria 'inhabilis Selenka, Beitriige zur Anatomie u. Systematik der Holo- 

 thurien, Zeitschr. f. wiss. Zool., XVII, 1867, p. 333, pi. xix, figs. 73-74. 



Tentacles 20. Pedicels numerous, uniformly' distributed. Deposits: 

 Tables and buttons. Solid tables with twelve spines on margin of 

 disk. The very nmnerous buttons are of a more unusual shape, 

 symmetrical swollen, with two rows of minute holes, about four holes 

 in each row; the surfaces of the buttons are luieven, owing to the 

 presence of flattened elevations (no knobs), and their margin is deeply 

 undulated. Madreporic body free, very small. In the middle line of 

 ventral surface is a deep longitudinal furrow. Skin thick and rough. 

 Blackish l)rown. Length 80 mm. 



Not secured hy AJlxitros.^ expedition. Recorded also from Society 

 Islands. 



HOLOTHURIA IMPATIENS ( Forskal). 



Plate LXIX, figs. 4, 4a-<J. 



Fistularia impatiens P'orskal, Descriptiones aninialiuni, etc., 1775, p. 121, pi. 



XXXIX, fig. B. 

 Holothuria bnpatievx Gmelin, LiniiPei Systenia Naturte, 13th ed., 1788, p. 3142. 



Body elongate; general form subcylindrical, broadest in posterior 

 region. No superficial distinction between dorsal and ventral sur- 

 faces. Mouth and anus terminal, the former rather small. Tentacles, 

 18 to 20, crowded. Amlmlacral appendages pedicel-like "papillBe," 

 borne on warty protuberances, which are frequently conspicuously 

 lighter in color than the rest of body. The}" are fairly evenl}' scat- 

 tered over the surface, and do not form series. They have a terminal 

 plate. Perisome wrinkled, and roughened by the spires of the tables, 

 so that the textuie is very characteristic. Deposits: Crowded tables 

 and buttons; tables with a subcircular smooth disk pierced by a cen- 

 tral and eight peripheral, slightly smaller holes; spire consisting of 



