191 



of green. Furthermore the size and the shape of the anchors and 

 anchor-plates afford usuable characters for separating the two species. 



Synaptula reticulata (Semper). 



Synapta reticulata. Semper. 1868. Die Holothurien, pag. 13. Pl. IV 



fig. 4—5, Pl. V fig. 12 & 23, Pl. VI fig. 9. 

 Synapta reticulata. Sluiter. 1888. Die Evertebraten . . ., pag. 214. 

 Chondrocloea reticulata. 0stergren. 1 898. Das System der Synaptiden. 



Sluiter. 1901. "Siboga u Holothurien, pag. 127. 

 Synaptula reticulata. Clark. 1908. The Apodous Holothurians, pag. 86. 



— — Clark. 1924. The Synaptinae, pag. 477. 



Off Toeal. 21. III. 1922. 1—2 m. Between Hydroids and Alcyonarians. 

 75 specimens. 



Toeal. 21. III. 1922. 2 m. Sand. Eunice-tubes. 4 specimens. 



There is in my opinion no doubt that this is Sempers Syn- 

 apta reticulata, though the present specimens have some more 

 digits and polian vesicles. The specimens at hand measure from 

 1 — 4 cm in length. The colour is more or less dark purple and 

 distinctly reticulated. The small specimens are much darker than 

 the larger ones, and the suggestion lies at hand that these specimens 

 represent Bedford's variety var. nigropurpurea. This may be right, 

 but as there are no other distinct differences between the small 

 and the large specimens, I do not suppose that there is reason 

 enough for separating them into two groups. 



There are usually 10 tentacles. A single one has only 9, but 

 none of the 79 specimens at hand have more than 10. Each 

 tentacle is supplied with 15 — 17 pairs of digits, which are united 

 by a web. The eyes are small and hardly visible on the oral disk. 

 The cartilaginous ring is very stout, and on its exterior side there 

 are large muscular impressions. The anterior margin is very 

 characteristic. The calcareous ring is a little reddish, but there 

 are no traces of green. The radial pieces (Fig. 25. 1) are perforated. 

 The cartilaginous ring is well developed around the calcareous ring, 

 and its posterior part is distinctly "tentacle-canals". There are 

 12 — 14 polian vesicles and a single stone-canal. The madreporite 

 is short and agrees pretty well with Semper's figure. The gonads 

 are thin and several times branched. The oesophagus is distinctly 

 different from the intestine which has a large loop. On the mes- 

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



