177 



is voluminous and the perforations through its posterior margin are 

 small. The calcareous ring (Fig. 21. 11) is in all but one of the 

 present specimens pure white. The large specimen differs in the 

 shape of the calcareous ring from the other three. The faint 

 projection on the anterior margin is, in this specimen, wanting 

 (Fig. 21. 10), but whether this is abnormal, or this specimen 

 ought to be separated from the other specimens, it is not possible 

 to see, but as it agrees pretty well with the other specimens in 

 all the other characters, I do not think it wrong to refer them all 

 four to the same species. There are many polian vesicles and a 

 single stone-canal. The madreporite is long and elongated along 

 the stone-canal. The gonads are long and branched and the intestine 

 has a large loop. On the mesenteries there are ciliated funnels 

 of the usual size and shape. 



The anchors and anchor-plates in the posterior end of body are 

 different f:'om those in the anterior end. The posterior anchors 

 (Fig. 21.5) measure ca. 360 // in length and 200 fi in width; those 

 more anteriorly (Fig. 21.6) ca. 320 // in length and 200 // in width. 

 The stock is finely dented and on the vertex there are some minute 

 knobs. The posterior plates (Fig. 21.8) measure ca. 250 fi in length 

 and 200 fi in width. The bridge and the anterior margin of the 

 articular hole is more or less serrate. In the posterior end of the 

 plates there are 4 — 5 small holes. The plates from the anterior end 

 of body (Fig. 21.9) are of the same shape as those more posteriorly, 

 but they measure ca. 220 fi x 170 fi. The miliary granules (Fig. 

 21. 7) are circles of minute granules. 



Synaptula denticulata n. sp. 



Toeal. 21. III. 1922. Ca. 2 m. Sand, Eunice-tubes. 7 specimens. 

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

 6 specimens. 



? Opposite Toeal. 25. III. 1922. Sand, coral-blocks. 1 specimen. 



The largest specimens at hand measure 16 — 20 cm, but the 

 majority are not longer than 6 — 8 cm. The small specimens are 

 greyish-green with white spots, the large ones are nearly colourless 

 and mottled with green and white. They have 13 tentacles, each 

 with ca. 25 pairs of digits united by a web. On the oral disk 

 there are distinct eye-spots. The cartilaginous ring is well developed 



Vidensk. Medd. fra Dansk naturh. Foren. Bd. 85. 12 



