106 THE APODOUS HOLOTHUBIANS 



PROTANKYRA INSOLENS. 

 PLATE V, PIG. 32. 



Synapta insolens Tlieel, 1886a, p. 13. Calcareous particles, pi. i, fig. 3. 

 Protankyra insolens Ostergren, 1898&. 



LENGTH. 40-110 mm. 



COLOR. Yellowish white. 



DISTRIBUTION. Beported from Torres Strait, 51 m. (Theel), and from near 

 the Aru Islands, 57 m. (Sluiter). 



EEMARKS. This "Challenger" species was found again by the "Siboga," 

 and may be easily recognized by the anchors, which are 600-650 p. long 

 and nearly 500 /. broad, with 12-18 teeth on each arm ; the broadly oval plates 

 with numerous dentate holes are also characteristic. There are five polian 

 vessels and a single stone-canal. 



PROTANKYHA BENEDENI. 



Synapta benedeni Ludwig, 1881o, p. 55. Calcareous particles, pi. in, figs. 19-20. 

 Protankyra benedeni Ostergren, 1898&. 



LENGTH. 22-35 mm.; diameter about one-fourth as much; obviously the 

 specimens were greatly contracted. 



COLOR. Whitish. 



DISTRIBUTION. Beported only from coast of Brazil (Ludwig). 



BEMARKS. Ludwig says that the whole appearance of this Synaptid is like 

 that of Labidoplax digitata, but the anchors and plates are so obviously differ- 

 ent there is no doubt of the distinctness of the two species. The miliary gran- 

 ules are minute rods, rounded at the ends and constricted at the middle. There 

 are six polian vessels and one stone-canal. 



PROTANKYRA RODEA. 

 PLATE V, FIG. 33. 



Synapta rodea Sluiter, 1890, p. 108. Calcareous particles, pi. i, figs. 10-14. 

 Protankyra rodea Ostergren, 1898&. 



LENGTH. Up to 250 mm. 



COLOR. Carmine red. 



DISTRIBUTION. Beported from Bay of Batavia; Lombok; Timor; and near 

 Madura, D. E. I., 330 m. (Sluiter). 



BEMARKS. The huge anchors and plates, the minute miliary granules, and 

 the conspicuous color make this species a notable one. There are two polian 

 vessels. In his original description Sluiter says the calcareous ring consists 

 of 17 pieces ; it would be interesting to know whether further observations con- 

 firm this peculiar number. This species lives in mud near the coral reefs. 



