The integument of chitons . 



The following publication by J. Blumrich will in many details not only create 



interest but it vill offer important connecting polnts in regard to some general 



questions. I want to potnt at some of them. 



Separation of chitons from the gastropod group and the additionof Neomenia and 



i 

 Chaetoderma and as a consequence the Opposition of amphineurids and conchiferids, 



form most significant progress in our knowlegge of mollusks.For that and many other 



important resul+s we havr to thank H.V. Ihering and we must always aknowledge that 



he broke the way in regard to these questions, even if some of his opinions were 



bettered by further studies.The contrast between Amphineurids and Conchiferids wil be 



strengthened with present study. We find that certain characteristics of integument, 



like strong cuticular- and spine structures of pallial margin are characteristic for 



amphineurids and confirm even further their belonging together, whereas in conchiferids 



the same characteristics are absent. Spine structure is characteristic in such high 



degree that we label group of amphineurids with synonym like Aculifera and place them 



against conchiferids . Similarity in development of spines and f orming of setae in 



annelids indicates a further, of course still hypothetical outlookjbeautiful study 



by Reincke found in following work by Blumrich some desired confirmations andfexpendings . 



If studiing the contrast/ between both parts of mollusks finds its confirmation, 



so finds also another quwstion an explanation, - the relations between chitons and 



Neomenia and Chaetoderma, which however contradicts the prevailing opinions about this qjji 



question.I am glad to see that in a shortly published note by excellent mollusk scientist 



Paul Pelseneer it came to the same results which we subsequently want to point out so 



that our observations could be considered as a confirmation of thase by Pelseneer. 



The integument of chitons shows on different parts of body a quite characteristic 



di SSä££2ki&y£%£äa&d tnls makes Possible an exact comparisson of these regions also 



