225 



Leptosynapta veducta n. sp. 



Port Jackson. 4. III. 1915. 2 fms. Sand. 49 specimens. 



The specimens at hand measure up to four cm in length. They 

 are as dolabrifera pale yellowish-white, and have twelve tentacles. 

 Each tentacle has 7 pairs of digits and 15 — 20 sensory cups. Eye- 

 spots are wanting. All the pieces of the calcareous ring (Fig. 35. 7) 

 are faintly biconcave with a little triangular projection on the anterior 

 margin. The radiais are perforated for the nerves. Cartilaginous ring 

 is wanting. There are 3 — 4 polian vesicles and a single unbranched 

 stone-canal. The oesophagus is distinctly different from the volum- 

 inous, folded intestine. The ciliated funnels (Fig. 35. 6) are of one 

 sort only, fanshaped and found on the body-wall. The gonads are 

 branched and the genital duct is not visible on the exterior surface 

 of the body. 



The anchors from the posterior end of body (Fig. 34. 5) measure 

 ca. 200 [a in length and 110^ in width, and those from the anterior 

 end (Fig. 34. 6) measure ca. 180^ in length and 1 00 ^ in width. 

 The anchors are all rather alike, only the posterior ones have some 

 few more teeth on the arms. The anchor-plates are very varying 

 in shape, and somewhat different in the two ends of body. The 

 plates from the anterior end measure usually ca. 130 fju in length 

 and 80 fi in width. They are very characteristic, being more or less 

 reduced in their articular end (Fig. 34. 10-12). The normal anchor- 

 plates from the posterior end (Fig. 34. 7-8) of the specimens measure 

 ca. 160 fi in length and 100 fi in width. They are usually not re- 

 duced in the articular end, where they have 4 — 6 small round holes 

 besides the side-holes and a long and narrow medial one. Besides 

 these large plates, there are often found some smaller more or less 

 reduced ones (Fig. 34. 9), no longer than ca. 110 fi in length. Some 

 of the specimens differ in having larger and lesser reduced anchor- 

 plates (Fig. 34. 13-16). 



in the body-wall there is but one sort of miliary granules. 

 These (Fig. 35. 8) are small, more or less bent rods. The rods in 

 the digits are not different from those in the tentacle-stem. They 

 are long and slender (Fig. 35. 9) and quite smooth. Their ends are 

 but faintly enlarged and often a little branched or forked. 



This species is characterized especially by the shape of the 

 calcareous ring and the tentacle-rods; furthermore the general 



Vidensk. Medd. fra Dansk naturh. Foren. Bd. 85. 15 



