lo TILLBERG, XEOMEMA. 



somewliat rapidly towards one of its extreinities. These 

 thicker tlireads present themselves principally at the upper 

 end of the organ, above the commencemeut of the calcareous 

 stavas, whereas the threads which surroiiud the staves them- 

 selves are entirely destitute of covering. Flat, rounded cells, 

 without ramifications, are foiind scattered in great niimbers 

 within the organ. 



As regards the systematic position of this singular animal, 

 some few remarks offer themselves, but it seems safer to defer 

 all detailed discussion on the subject uutil more complete in- 

 vestigations will have been made. As elsewhere, erabryology 

 will give the best clue to its affinities. At present the type 

 of Molliisea and that of Vermes seem both to claim Neomenia 

 as a distant relation, the latter perhaps with more right than 

 the former. Neomenia, howcver, presents considerable devia- 

 tions from both, in the absence of a radula, in the strueture 

 of the alimentary canal and of the nervöns system, as also 

 in other respects, as the form of the body and the spines 

 on the skin. 



Printed October 1875 



