THE APODOUS HOLOTHURIANS 107 



PROTANKYRA DENTICULATA. 



Prolankyra denticulate Koehler and Vaney, 1905, p. 105. Calcareous particles, pi. 

 xv, figs. 36-39. 



LENGTH. Over 70 mm. ; diameter, 12 mm. ; known only from a fragment. 

 COLOR. Brownish. 



DISTRIBUTION. Off Madras, India, 738 m. (Koehler and Vaney). 

 REMARKS. Although allied to rodea, the shape of the plates easily distin- 

 guishes this species. 



PROTANKYRA ASYMMETRICA. 

 PLATE V, FIGS. 35 AND 36. 



Synapta asymmetrica Ludwig, 1874, p. 78. Calcareous particles, pi. vi, fig. 2. 

 Protankyra asymmetrica Ostergren, 1898&. 



LENGTH. 40 mm. 



COLOR. ' ' Colorless. ' ' 



DISTRIBUTION. Reported from Banka, Sunda Islands (Ludwig, Theel); 

 Saleyer and near Madura, 82 m., D. E.I. (Sluiter). 



REMARKS. The remarkable accessory calcareous plates with their four sym- 

 metrical holes and the peculiar anchors would seem to be sufficiently diagnostic, 

 but Sluiter ( :01, p. 129; PI. X, fig. 13) describes and figures still other re- 

 markable accessory calcareous bodies, in the form of curious double-headed 

 rods. It is virtually certain that neither Ludwig nor Theel would have over- 

 looked such calcareous bodies, so we are safe in assuming that they were not 

 present in the specimens from Banka. The question naturally arises whether 

 their presence in Sluiter 's specimens would not indicate an important specific 

 difference, but we must await further material before we attempt to decide 

 the point. Ludwig 's specimen had four polian vessels and one stone-canal. 

 The anchors are 500 /* and their plates about 400 ^ in length, and the accessory 

 plates are about 50 /* in diameter. 



PROTANKYRA LUDWIGII. 

 PLATE V, FIG. 34. 



Synapta ludwigii Sluiter, 1890, p. 108. Calcareous particles, pi. i, figs. 4-9. 

 Protankyra ludwigii Ostergren, 1898&. 



LENGTH. 40 mm. 



COLOR. Ranges from carmine-red to "colorless," with a reddish tinge on 

 the tentacles. 



DISTRIBUTION. Reported from Bay of Batavia ; near Timor, 73 m. ; and near 

 Flores, 247 m. (Sluiter). 



REMARKS. While evidently allied to the preceding species, the very differ- 

 ent accessory calcareous plates are an excellent mark of distinction. The 



