104 THE APODOUS HOLOTHURIANS 



PROTANKYRA ACULEATA. 



Synapta aculeata Theel, 1886a, p. 13. Calcareous particles, pi. i, fig. 3. 

 Proiankyra aculeata Ostergren, 1898&. 



LENGTH. More than 65 mm. ; only fragments known. 



COLOR. Light brownish or dirty white. 



DISTRIBUTION. Coast of Japan, 621 meters (Theel). 



EEMARKS. This interesting species has the anchors 1.1 mm. long and the 

 plates only about two-thirds as much. The anchors vary greatly in shape 

 and sometimes even have flukes at both ends. In the type specimen the miliary 

 granules occurred in a double row in each radius and were of a simple oval 

 form. 



PROTANKYRA CONFERTA. 



Protarikyra conferta Koehler and Vaney, 1905, p. 105. Calcareous particles, pi. xv, 

 figs. 26-29. 



LENGTH. More than 72 mm.; only fragments known. 



COLOR. Brownish. 



DISTRIBUTION. Recorded from near Ceylon, 1,450 m., and off Masulipatam, 

 Madras, 1,220 m. (Koehler and Vaney). 



EEMARKS. This is one of the deep-sea species taken by the "Investigator," 

 and regarding which we know all too little. The anchors are strikingly like 

 those of brychia except in the length of the arms. 



PEOTANKYRA ERRATA. 



Proiankyra errata Koehler and Vaney, 1905, p. 106. Calcareous particles, pi. xv, 



figs. 14-16. 

 Proiankyra inflexa Koehler and Vaney, 1905, p. 109. Calcareous particles, pi. xv, 



figs. 30-32. 

 "Ankyroderma marenzelleri Theel" Walsh, 1891. 



LENGTH. 32-110 mm. and more; diameter about one-sixteenth as much. 



COLOR. Not recorded. 



DISTRIBUTION. Reported from near Andaman Islands, 234-270 m., and from 

 Gulf of Bengal, 738-864 m. (Koehler and Vaney). 



REMARKS. The characters distinguishing inflexa from errata are too slight 

 to justify us in keeping them separate, and it is probable that both are forms 

 of aculeata, which is apparently a very variable species. Koehler and Vaney 

 are authority for saying this species is Walsh's Ankyroderma marenzelleri. 



