No. I.] 



DESMOGNATHUS FUSCA. 



279 



DESCRIPTION OF FIGURES. 



With the exception of Hgs. 18 and 48 (which were outlined from photo- 

 graphs) and Figs. 20, 21, 22, 23, and 24 (which were traced from other figures), 

 all were outlined by the aid of Abbe's camera lucida, and some of the details 

 filled in free hand. All of the figures of transections are arranged to face the 

 observer, so that their right sides correspond to his left. In the case of the 

 frontal and transections, the outlines of the figures were drawn from one series of 

 sections, and the fiber tracts drawn in from another series — amyelinic from Golgi 

 preparations, and the myelinic from Weigert's. 



REFERENCE LETTERS. 



