294 



The specimens at hand measure up to 3 cm in length, a single 

 one is 4,5 cm. The colour is in alcohol yellowish-white with pure 

 white wheel-papillae. These are found in both radii and interradii, 

 without any arrangement in longitudinal rows. They are densest 

 close behind the dorsal tentacles, and nearly wanting on the ven- 

 tral side of the posterior end. There are twelve tentacles, each 

 with 7 pairs of digits. The calcareous ring consists of twelve pieces, 

 of which the seven interradiais are rather alike. The two dorsal 

 radiais (Fig. 60. 7) are perforated for the nerves and thus different 

 from the three ventral ones (Fig. 60. 8) which are only notched 

 in the anterior margin. The posterior margin of the ventral radiais 

 is usually as that of the dorsal ones, slightly concave, but in some 

 specimens the mid-ventral radial differs from that of the two lateral 

 ones (Fig. 60. 11). A cartilaginous ring is wanting. There are 10 — 

 12 polian vesicles of different size and a single stone-canal. The 

 madreporite (Fig. 60. 9-10) is much folded. The alimentary canal 

 has a large loop and on the mesenteries there are numerous ciliated 

 funnels. Ludwig states that the ciliated funnels in rotifera are 

 found singly on the mesenteries. This is also the fact with the 

 larger part of the funnels, but close to the body-wall where they 

 are exceedingly dense, they may be united into rather longstalked 

 clusters (Fig. 59. 1). 



The rods in the skin are, as the rods in aponocrita, uniformly 

 scattered all over the body but not so densely. The shape of the 

 rods (Fig. 60. 6) is rather varying, but they are usually slightly 

 curved and often enlarged on the middle and at the ends. In the 

 longitudinal muscles there are oblong bodies (Fig. 60. 12). These 

 are usually smooth, with enlarged ends, their outline being often 

 a little undulating. The deposits in the tentacle-base are as in 

 aponocrita very like those in the longitudinal muscles (Fig. 60. 5), 

 and those in the digits (Fig. 60. 4) are large curved rods with 

 branched ends. The deposits in the polian vesicles (Fig. 60. 3) are 

 nearly straight rods with an often undulating outline. The gonads 

 are stated by Ludwig to be hermaphroditic, with which fact the 

 viviparity of the species seems to be in good accordance. The 

 larger part of the specimens examined have eggs in the gonads, 

 but the presence of sperma cannot be ascertained. Only a single 

 specimen seems to have merely sperma in the gonads, but whether 



