xiv Journal of Comparative Neurology. 



apart from the others ; which, in this case, are inadequately referred 

 to, and sometimes incorrectly interpreted. 



In the forty-four pages which the article covers, are set forth the 

 results of a minute investigation of the internal origin of the vagus in 

 Salmo, in connection also with specimens of /V?/-ra, Leuciscus, SqiiaVms^ 

 Bar bus and Cyprinus. 



Three centers of origin and termination for vagal fibers are recog- 

 nized, — a dorsal sensory nucleus, middle motor and ventral motor nu- 

 cleus. The dorsal (sensory) nucleus, which is the direct continuation 

 of the dorsal cornua of the spinal cord, is composed of two portions, an 

 inner [Lobus Vagi autor.] and an outer ; from these the vagal fibers 

 are derived, springing in part from nerve cells located in the nuclei, 

 from the diffuse nervous reticulum, and also sometimes from what he 

 terms the " latero-dorsal longitudinal bundle" which he recognizes 

 later as the homologue of the ascending root of the Trigeminus in 

 Cyprinoids (Mayser) [and it may be added in other Teleosts. ] 



The fibers derived from the middle nucleus are motor. The 

 nucleus is of varying extent in the different forms and is regarded by 

 the author as a differentiation of the part of the ventral horn lying 

 nearest the central canal. The lower (ventral) nucleus is the direct 

 continuation of the ventral horn and its cells are conspicuously larger. 

 Fibers also of crossed origin occur from both the middle and ventral 



nuclei. 



Dr. Haller adds a comparison with the Cyprindae which possess a 

 much concentrated oblongata ; and, by means of literature, with higher 

 forms (Batrachia, Reptiles, Birds, Mammals.) 



In Mammals the Nucleus ambiguus is regarded as representing 

 (in part) the middle vagal nucleus of fishes which also includes the 

 homologue of the nucleus of the Hypoglossal nerve which, therefore, 

 he regards as included in the vagus of fishes and not in the post-vagal 

 nerves, which are discussed in the beginning of the article with conclu- 

 sions to this effect. The homology of the fasciculus solitarius of mam- 

 mals with the " latero-posterior longitudinal bundle " [ascending root 

 of the Vth] is suggested, based on the connection with the dorsal 

 cornua of the spinal cord and its relation to the vagus. 



B. F. K. 



The Ampullae of Loreiizini.* 



This paper, upon the Ampullae of Lorenzini, is a preliminary pub- 

 lication of a portion of the results of a more extended study of the 



' Peabody, J. E. The Ampullae of Lorenzini of the Selachii, Zoological 

 Bulletin, Vol. I, No. 4, pp. 163-177, 1897, 8 figs, in text. 



