179 



and has 13 small holes close to the posterior margin. The cal- 

 careous ring (Fig. 22. 4) is green with white longitudinal stripes 

 along the sutures of the pieces. The radiais are perforated. There 

 are 20 polian vesicles and a single stone-canal. The madreporite 

 is short. The gonads are in the large specimens well developed 

 and distinctly branched. In the small ones they are undeveloped. 

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

 ciliated funnels of the usual size and shape. 



The anchors and anchor-plates are not different in the two ends 

 of body. The anchors (Fig. 22. 1) measure ca. 320 // in length and 

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

 are minute knobs. The anchor-plates (Fig. 22. 2) measure ca. 220 \ju 

 in length and 160 fi in width. The anterior margin of the articular 

 hole is, as well as the bridge, distinctly serrate. In the posterior 

 end of the plates there are 7 small holes. The bridge is often 

 malformed with one or two long projections, which are, as the pro- 

 jections in the malformed plates in recta and virgata, fastened to 

 the anterior margin of the articular hole. The miliary granules 

 (Fig. 22. 3) are rosettes which are gathered into heaps. 



This species differs distinctly from psara in the shape and the 

 colour of the calcareous ring and in the short madreporite, and 

 from virgata in the colour, in the shape and colour of the calca- 

 reous ring and in the arrangement of the miliary granules. 



Synaptula tualensis n. sp. 

 Toeal. 21. III. 1922. 2 m. Sand. 3 specimens. 



One of the specimens at hand is but a fragment; the two 

 others measure 6,5 cm and 7,5 cm in length. The colour is, as 

 the colour of the small specimens of denticulata y greyish-green with 

 white spots. There are 13 tentacles, each with ca. 18 pairs of digits 

 united by a web. The eyes are small and not visible on the oral 

 disk. The cartilaginous ring is well developed and with small per- 

 forations close to the posterior margin. The calcareous ring (Fig. 

 22. 9) is distinctly green and the muscular impressions are faint. 

 The radial pieces are perforated for the nerves, and the interradial 

 pieces have a long projection on the anterior margin. There are 

 15 polian vesicles and a single stone-canal. The madreporite is 

 large and elongated along the stone-canal. The gonads are well 



12* 



