176 



each with 6 — 8 pairs of digits united by a web. The eyes are very 

 faint and hardly visible. The cartilaginous ring is, as in virgata, well 

 developed only around the calcareous ring and has large perforations. 

 The calcareous ring is pure white and the radial pieces (Fig. 21.2) 

 are perforated for the nerves. There are 8 polian vesicles of which 

 two are much smaller than the other six. The stone-canal is single. 

 The gonads are well developed and branched. The oesophagus is 

 thick and glandular and the thin intestine has a large loop. On 

 the mesenteries there are ciliated funnels of the usual size and shape. 



The anchors and anchor-plates from the two ends of the specimen 

 are not distinctly different in size, and in the posterior end there 

 is but one size of anchors and plates. The anchors (Fig. 21. 4) 

 measure ca. 250 jw in length and 150 fi in width. The stock is 

 finely dented and on the vertex there are minute knobs. The an- 

 chor-plates (Fig. 21. 3) measure ca. 200 /* in length and 150/* in 

 width. The articular holes as well as the bridges are totally smooth 

 and in the posterior end of the plates there are five small holes. 

 The miliary granules (Fig. 21. 1) are rosettes, which show different 

 stages of dissolution of the medial part. 



This species is closely related to virgata, and there is much 

 reason for supposing that future investigations will show it to be 

 synonymous with that species. The general appearance, the one 

 size of anchors and plates as well as several small differences 

 make it however unjustifiable for the present to refer it to virgata. 



Synaptula psara (Sluiter). 



Synapta psara. Sluiter. 1888. Die Evertebraten. . . . Batavia, p. 219. 

 Chondrocloea psara. 0stergren. 1898. System der Synaptiden. p. 114. 



Sluiter. 1901. "Siboga" Holothurien. pag. 126. 

 Synaptula psara. Clark. 1908. The Apodous Holothurians. pag. 84. 



Clark. 1924. The Synaptinae. pag. 475. 

 Vatek. III. 1922. 4 specimens. 



The largest specimen at hand measures ca. 30 cm in length 

 and 1,5 cm in diameter. The colour is pale reddish-grey with some 

 faint white spots due to heaps of miliary granules. There are 13 ten- 

 tacles, some few, 1 — 2 of which are shorter and evidently regenerating. 

 Each tentacle has ca. 25 pairs of digits united by a web. The eyes 

 are small and not visible on the oral disk. The cartilaginous ring 



