168 



Synaptula striata (Sluiter). 



Synapta striata. Sluiter. 1888. Die Evertebraten. . . . Batavia, p. 216. 

 Pl. II f. 39-40. 



Chondrocloea albo-punctata. Sluiter. 1901. "Siboga" Holothurien. p. 127. 

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

 Toeal. 25. III. 1922. Rocky wall with sponges. 8 specimens. 



The specimens at hand measure ca. 30 cm in length. Their 

 colour is bluish-grey with white spots, due to large heaps of miliary 

 granules. They have 13 tentacles, but some of the tentacles are often 

 very small and seemingly regenerating. Each tentacle has ca. 20 

 pairs of digits, which are not united by a web. On the oral disk 

 no eye-spots are visible, and the eyes are found to be very small. 

 The cartilaginous ring is voluminous and nearly quite encloses the 

 calcareous ring; it is perforated along its posterior margin. The cal- 

 careous ring (Fig. 16. 7) is pure white. It differs in shape distinctly 

 from that of recta, as the posterior margin of the pieces is distinctly 

 notched. On the exterior side there are muscular impressions and 

 the radiais are perforated for the nerves. There are many polian 

 vesicles and a single stone-canal. The gonads are large and branched. 

 The intestine has a loop and on the mesenteries there are ciliated 

 funnels of the usual size and shape. 



The anchors (Fig. 16. 8) measure ca. 350 /tv in length and 220 ^ 

 in width. The stock is finely dented and on the vertex there are 

 minute knobs. The anchor-plates (Fig. 17. 9-10) are less varying 

 than the plates in recta, but they are somewhat different in the two 

 ends of the body. They measure ca. 230 [ju in length and 170 ft 

 in width. The articular hole as well as the bridge, is distinctly 

 serrate. In the posterior end of the plates there are, in the plates 

 from the anterior end of the body, ca. 4 holes and, in the plates 

 from the posterior end of the body ca. 9 holes, of which the medial 

 one is the largest. The miliary granules (Fig. 16. 9) are rosettes, 

 a little larger than the rosettes in recta. 



Synaptula striata is the most closely related to recta, but differs 

 in the shape of the calcareous ring and the calcareous deposits 

 so much from it that I have no doubt that it is a valid species. 

 The description of Chondrocloea albo-punctata agrees so well with 

 the specimens at hand, that I suppose it is synonymous with 

 striata. 



