

-3- 

 gill forraation and forming of the foot along the body in contrast to the gradually 

 limited forming of these organs ( through retrogressive metamorphosis) in other 

 species, I could add still an impottant argument.The lateral nerve fiber, pleural fiber, 

 is placed in Chitons directly along the gills very close to the integument of gill 

 cavity. In other forms ( already in Chitonellus pl. 26, fig. 21n) it raoves xsx ever 

 deeper into the interior of the body and at the same time together with it the accompanie 

 gill artery and - vein. The formations seem to be finally completely beaten down"^, 

 (stratified) by powerful musculature. Not only in its structure but also in distincter 

 relations to the gills it seems that original conditions should be considered in Chiton. 



We agree also completely with Pelseneer's opinion, that among Amphineurids the 

 Shitons are closer to the mutual phyllum than Chitonellus and Aplacophora (Neomenia and 

 Chaetoderma) , a concluslon, which is of greatest importance, if it is a question of 

 further research about the derivation of the whole mollusk phyllum. 





