THE APODOUS HOLOTHURIANS 103 



identical, especially since their geographical distribution is the same. The 

 type specimen of dlstincta is a fragment, and all of Theel's specimens were 

 also incomplete. Semper says there are four polian vessels and one stone 

 canal. 



Protankyka axttopista. ^ 



Plate V, Fig. 31. 



Synapta autopista v. Mareuzeller, 1881, p. 133. Calcareous particles, pi. iv_, fig. 3. 

 Protanhyra autopista Ostergren, 1898&. 



Length. — More than 20 mm. ; diameter of only known fragment, 6 mm. 



Color. — Reddish brown. 



Distribution. — Reported from Miya Bay, Japan (v. Marenzeller). 



Remarks. — The very small size of the anchors and the peculiar shape of 

 the stock easily distinguish this species, and yet it may be that the type and 

 only known specimen is simply the anterior part of the body of a peculiar in- 

 dividual of the preceding species. 



Peotankyra brychia. 



Plate IV, Figs. 12-14. 



Synapta brychia Verrill, 1885&, p. 539. 

 Protanl-yra brychia Ostergren, 18986. 



Length. — 160 mm. ; diameter about one-sixteenth as much. 



Color. — Purplish brown or gray (in alcohol). 



Distribution. — Off Cape Hatteras, 1,688 m. (Verrill). 



Remarks. — The very large anchors and plates, a millimeter or more in 

 length, are arranged in approximately three longitudinal rows in each inter- 

 radius. Verrill says the anchor-arms are smooth; but that is not the case 

 in the fully-developed anchors, which have about six teeth on each arm. There 

 are no accessory calcareous bodies in the skin. There are at least two polian 

 vessels and one stone-canal. The tentacles are unknown. 



Protankyra suspecta. 

 Protanhyra suspecta Sluiter, 1901, p. 132. Calcareoiis particles, pi. x, fig. 14. 



Length. — More than 70 mm. ; only a fragment known. 



Color. — Not recorded. 



Distribution.— Buton Straits, D. E. I., 148 m. (Sluiter). 



Remarks. — This is another of the discoveries made by the "Siboga," and 

 also, unfortunately, another of the species known.from only a slight, headless 

 fragment. Although related to the preceding species, the differences are ob- 

 vious. 



