108 THE APODOUS HOLOTHURIANS 



auehors are about 500 /x in length and their phites only a little shorter; the 

 accessory plates are about 80 /* in diameter. There are only two poliau ves- 

 sels and one stone-canal. 



Protankyra petersi. 



Plate IY, Figs. 15 and 16. 



Synapta petersi Semper, 1868, p. 230. Calcareous 2)artieles, pi. xxxix, fig. 13. 

 Protanl-yra petersi Ostergren, 1898&. 



Length. — 130 nam. 



Color. — Clear reddish. 



Distribution. — Eeported only from Amboina (Semper). 



Remarks. — The type specimen of this interesting species still remains 

 unique. The curious grotesque anchors are accompanied by normal plates 

 perforated with numerous smooth holes. Nothing is known of the habits, hab- 

 itat, or anatomy. 



Protankyra pseudo-digitata. 



Synapta pseudo-digitata Semper, 1868, p. 9. Calcareous particles, pi. iv, fig. 12. 

 Synapta innominata Ludwig, 1874, p. T9. Calcareous particles, pi. vi. fig. 4. 

 Protankyra pseudo-digitata Ostergren, 1S98&. 

 Protankyra innominata Ostergren, 189S&. 



Length. — 60 mm. 



Color. — Not recorded. 



Distribution. — Reported from Bohol, Philippines, 27 m. (Semper) ; Philip- 

 pines (Ludwig); and Macasser (Sluiter). 



Remarks. — Ludwig himself expressed the opinion that his species was pos- 

 sibly identical with Semper's, and Lampert ('85) emphasizes the point. There 

 is little doubt that such is the case. Ludwig had only a fragment 10 mm. long 

 for his description and Semper had lost his only specimen when he wrote his 

 description. He says it was similar to Lahldoplax digitata in appearance, 

 and Sluiter ( :01) tells us there are 12 tentacles, each with four digits. 



Protankyba bankensis. 



Synapta hanhensis Liidwig, 1874, p. 78. Calcareous particles, pi. vi. fig. 1. 

 Protanl-yra bankensis Ostergren, 18986. 



Length. — More than 75 mm.; only fragments known. 



Color. — Whitish with a reddish tinge. 



Distribution. — Reported only from Banka, Sunda Islands (Ludwig, 

 Theel). 



Remarks. — This species is certainly nearly related to the preceding and it 

 is an open question whether they are not identical. The differences in the cal- 

 careous particles are not beyond the range of individual diversity. 



