163 



of green. On the exterior side there are distinct muscle-impressions 

 and the radiais are perforated for the nerves. The cartilaginous ring 

 is faint, and only visible around the calcareous ring. There are eight 

 large polian vesicles and 10 — 12 small ones. The stone-canal is 

 single. The gonads are short and thick and bushy-branched. The 

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

 funnels of the common shape. 



The anchors and plates in the posterior end of body are a little 

 larger than those more anteriorly. In the posterior end there are 

 some few small anchor-plates (Fig. 15. 15), but the corresponding 

 anchors are wanting. The small plates measure ca. 1 10 pu in length. 

 The normal anchors from the posterior end of body (Fig. 15. 10) 

 measure ca. 260 [i in length and 150 jtt in width. The arms are 

 relatively short and on the vertex there are some few minute knobs. 

 The anchors from the anterior end of body measure ca. 220 fi in 

 length and ca. 130 {i in width. Their arms are relatively longer 

 than the arms in the anchors from the posterior end of body (Fig. 

 15. 11), and the shape of the vertex is also a little different. The 

 stock is finely dented in both forms of anchors. The anchor-plates 

 from the anterior end (Fig. 15. 12) measure ca. 175 p, in length 

 and 130 ^ in width, and those from the posterior end (Fig. 15. 17) 

 measure ca. 200 pu x 160 p. The articular hole as well as the bridge 

 are in all three sizes of plates distinctly serrate. In the posterior 

 end of the plates there are two to three small, smooth holes. 



The miliary granules (Fig. 15. 16) are rosettes which measure 

 ca. 25 p in diameter. As mentioned (pag. 157) the rosettes in this 

 specimen have changed into circles of minute granules (Fig. 15. 13) 

 on account of a slight acidity in the preserving fluid. 



This species is in some characters rather like virgata, but in 

 others so much like reciprocans, that it will not be correct to refer 

 it to any of the two species. 



Synaptula aspera (Sluiter). 



Chondrocloea aspera. Sluiter. 1901. "Siboga" Holothurians. pag. 128. 

 Pl. X fig. 12. 



Synaptula virgata. Clark. 1908. The Apodous Holothurians. pag. 85. 

 Vatek, opposite Toeal. III. 1922. Rocky shore. 0—2 m. 1 specimen. 

 Toeal. 25. III. 1922. Rocky wall with sponges. 3 specimens. 



11* 



