J5 



Ratte, Felix, Notes on some Australian Fossils. 1. Salisburia palmata, 



emend, from Jeanpaulia or Baiera palmata Eatte. Proceedings of the 

 , Linnean Society of New South Wales, Ser. II, Vol. II, Tart 1, S. 135 



bis 137. 2. On the Muscular Impression of the Genus Notomya 



(Maeonia). With 1 Plate. Ibidem, S. 139—140. 

 Stephens, On some additional Labyrinthodont Fossils from^^the Hawkes- 



bury Sandstone of New South Wales. Proceedings of ^the Linnean 



Society of New South Wales, Series II, Vol. II, Part I, ^S. 153—156. 

 Thomas, Oldfleld, Diagnoses of two new Central- African Mammalia. 



Annals & Magazine of Natural History, Nr. 120, December 1887, 



S. 440—441. 



Aufsätze. 



The old Mouth and the new. 



A Study in Vertebrate Morphology. 

 By J. Beaed, Freiburg i. B. 



Aus dem Anatomischen Institut zu Freiburg i. B. 



"The question of the nature of the mouth" says Prof. Dohkn 

 in one of the first of his celebrated „Studien zur Urgeschichte etc.", 

 "is the point about which the whole morphological problem of the 

 Vertebrate body revolves." According to Dohrn the present mouth 

 of Vertebrates arose from the coalescence of a pair of gill-clefts. In 

 this we have an example of Dohrn's principle of change of function, 

 and also, as I hope soon to demonstrate, of Kleinenberg's law of 

 the substitution of organs. I do not now wish or intend to give an 

 account of the researches by which Dohrn showed that the mouth 

 in some cases first arises as a pair of lateral invaginations of epiblast, 

 still less of my own small contribution to this question, which con- 

 sisted in recording the facts that the mouth also resembles a gill- 

 cleft in some other particulars. 



It suffices here to say that these researches have not yet been 

 refuted, and that the view that the present mouth of Vertebrates is, 

 so to speak, a new structure rests on a very sound foundation. 



With the blastopore as the foundation of mouth and anus, I 

 have here no concern; nor have I any sort of sympathy with the 

 upholders of a theory which has been condemned and rejected by 

 embryologists, such as Lankester, Kleinenberg and Saeensky. 



