SUR LA MORPHOLOGIE DES COTES, 



LOUIS DOLLO, 



Conservateur au Musée royal d'Histoire naturelle de Belgique, 

 à Bruxelles. 



1. — En 1887, M. G. Baur, actuellement professeur à la Clark 

 University (Worcester, Mass., Etats-Unis), publiait (1), sur la 

 morphologie des côtes, une note dont voici les conclusions : 



« 1. The ribs are developed beiween the myocommata; they are, 

 therefore, intervertébral. 



2. The ribs are originally one-headed and connected with well- 

 developed intercentra. 



3. Ail forms and connections of the other ribs can be derived 

 from that condition. 



4. The lower arches of the caudal vertebrse are either formed by 

 true ribs, the oldest flshes (Ganoidei, Dipnoi), or by processes of the 

 intercentra (Teleostei, Stapedifera). 



il) G. Baur, On the Morphologj of Ribs. American NutuniUst (E. D. Gope et J. 

 S. Kingsi^y), Philadelphie, 1887, p. 942. 



