197 



but as the calcareous deposits and the calcareous ring are rather 

 alike, I have referred them to the same species. 



Synaptula bandae is not closely related to any other known 

 species. 



Synaptula membvana n. sp. 



Between Koh Mesan and Koh Chuen. 6.II.1900. 15 fms. Stones. 2 

 specimens. 



Off Neira Banda. 14.VI.1922. 25 m. Sand. 2 fragments. 1 ) 



The specimens from 6. II. 1900 measure 5 cm in length; their 

 colour is pure white. They have ten tentacles. Each tentacle is 0,5 

 cm long, with 16 — 20 pairs of long and slender digits, which are 

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

 disk. The cartilaginous ring is very faintly developed or quite want- 

 ing, and the circular canal is unusually thick. The pure white cal- 

 careous ring (Fig. 26. 8) is stout and of a very characteristic shape, 

 different from the calcareous ring in all other known species. The 

 interradiais have long anterior processes and their posterior margin 

 is, contrary to that of the radiais, only slightly concave. The radiais 

 are perforated for the nerves. There are 18 and 29 polian vesicles 

 in the two specimens from Siam and the stone-canal is single. The 

 oesophagus is distinctly different from the rest of the alimentary 

 canal, and on the intestine there is an unusually large loop. The 

 loop measures ca. 4 cm in length and the specimens are as said 

 5 cm long. On the mesenteries there are ciliated funnels of the 

 usual shape and size. 



The anchors (Fig. 26. 5) measure ca. 230 fi in length and 150 ^ 

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

 minute knobs. The plates (Fig. 26. 6) measure ca. 200 /* in length 

 and 160 /ii in width. The articular hole is usually smooth. The 

 bridge is often smooth, though there are usually some small teeth 

 on it. In the posterior end of the plates there are ca. 7 small 

 holes, the medial one of which is distinctly the largest. The miliary 

 granules (Fig. 26. 7) are rosettes, which are lying in so dense a 

 layer that it is nearly impossible to see the anchors and plates. 



This species is not closely related to any of the others; it is 

 very distinctly characterized by the long tentacles, the calcareous 



) The identification of the two fragments from off Neira is not beyond doubt. 



