188 



the characters are so varying and the differences so slight that, 

 for the present at least, it will be the better not to separate them. 



Synaptula rosetta n. sp. 



Off Jolo. 18.111.1914. 15 fms. Coral-sand. One specimen. 



The specimen at hand measures 3 cm in length by 0,3 cm in 

 diameter. The colour is uniformly pale red. It has twelve tentacles, 

 but as only one specimen is present it is not quite certain that 

 this is the normal number of tentacles. Each tentacle has 6 — 8 

 pairs of digits which are united by a web. The eyes are small 

 and faintly visible on the oral disk. The calcareous ring is pure 

 white and the radial pieces are perforated for the nerves. The 

 cartilaginous ring is faintly developed and its posterior part is, as 

 in hydriformis, "tentacle-canals". 



There are four polian vesicles and one stone-canal. The gonads 

 are faintly developed and distinctly branched. The intestine has a 

 loop and on the mesenteries there are ciliated funnels of the usual 

 shape and size. 



There is only one sort of anchors (Fig. 24. 6) which measure 

 ca. 200 fi in length and 130 fi in width. The stock is finely 

 dented and on the vertex there are some minute knobs. The 

 normal anchor-plates (Fig. 24. 8) measure ca. 150 \i in length 

 and 120 fi in width. Their shape is rather unusual and characteristic 

 in the posterior end being very narrow. The articular hole is 

 usually smooth, and on the bridge there are some very small teeth. 

 In the posterior end there are three holes. Beside these plates 

 there are some few smaller ones (Fig. 24. 7) which measure ca. 

 100 fi in length and 90 fi in width. They differ from the normal 

 plates in their posterior end being not so distinct and with only 

 a single hole in it. 



The miliary granules (Fig. 24. 9) are large rosettes, which are 

 uniformly spread over the body. 



This species is, if the number of the tentacles is really twelve, 

 not closely related to any of the other species of the genus. If on 

 the other hand the number of tentacles is 13, which may very 

 probably prove to be correct, it is the most closely related to virgata, 

 from which species it differs both in the general appearance and 

 in the size and shape of the calcareous deposits. 



