257 



Protankyra innominata. 0stergren. 1898. Das System der Synaptiden. 

 pag. 117. 



Protankyra molesta. 0stergren. 1898. Op. cit. pag. 117. 

 Protankyra pseudo digitata. 0stergren. 1898. Op. cit. pag. 217. 

 Protankyra innominata. Sluiter. 1901. "Siboga" Holothurien. pag. 129. 

 Protankyra pseudo- digitata. Clark. The Apodous Holothurians. pag. 108. 

 Protankyra innominata. Koehler & Vaney. 1908. The littoral Holo- 



thurioidea collected by the Investigator, pag. 46, 



Pl. Ill fig. 17—20. 

 North of Koh Kong. 23. I. 1900. 8 fms. 6 specimens. 

 Off Koh Kut. 26. I. 1900. 5 fms. 2 specimens. 

 Koh Chuen. 23. II. 1900. 30 fms. 1 specimen. 

 West of Koh Kut. 4. III. 1900. 15 fms. 2 specimens. 

 Off Samalona, Makasser. 18. VI. 1922. 35 fms. 1 specimen. 



The largest specimen at hand measures 7,5 cm in length by 

 1,5 cm in diameter, thus being much larger than the specimens 

 described as innominata, which did not measure more than 1 cm 

 and 3,8 cm in length. The colour is pale white and the body-wall 

 is nearly quite translucent. There are 12 tentacles, each with four 

 digits. Sensory cups are wanting on the specimens at hand. On 

 the oral disk there are twelve eye-spots, but they are so faint, as 

 to be nearly invisible,. There are 6 polian vesicles and a single 

 stone-canal. The radial pieces of the calcareous ring are perforated, 

 and a cartilaginous ring is wanting. The gonads are branched. The 

 oesophagus is distinctly different from the intestine, but it is by far 

 not so muscular as in bidentata. Ciliated funnels are found at the 

 base of the mesenteries and often also on the body-wall, close to 

 the mesenteries. They measure 40 — 70 /u in length and are distinctly 

 different from the funnels in bidentata (Fig. 48. 7). The intestine 

 has a large loop. 



As in bidentata the calcareous deposits from the two ends of body 

 are different, and in the posterior end there are more than one 

 sort. The large anchors (Fig. 48. 1) are found only in the posterior 

 half of the interambulacra. They measure 620 — 650 [i in length and 

 410 — 430 in width. While the large anchors in the interambu- 

 lacra of bidentata are found alone, the large anchors in the present 

 species are surrounded by three different sorts, which are distinctly 

 smaller. The most common of these (Fig. 48. 3) measure ca. 225 // 

 in length and 170// in width. They differ from the large anchors 

 in being distinctly hollowed on the vertex and in having only 2 — 3 



Vidensk. Medd. fra Dansk naturh. Foren Bd. 85. 17 



