PLATE I. 



Fig. 1. Cranium of Amia calva from above ; life size. The dark piece projecting at 

 the lower right-hand angle is the continuation of Sc. The little piece at 

 the anterior end of the frontal suture is in cartilage, as is ol, and the trian- 

 gular wedge at the inner end of -E/so. SagemehPs original plates have all 

 the cartilage tracts in color, a pale blue. This could not be carried out in 

 the present connection. The lightly stippled and unlettered parts, gener- 

 ally, are in these figures, however, the cartilaginous tracts. 



Fig. 2. The same specimen, cranium seen from below. 



Fig. 3. The same specimen, the parasphenoid (Ps.) and the vomers ( Vo) having been 

 removed. (These three figures copied from Sagemehl's plates by Mr. H. L. 

 Todd.) 

 96 . 842 



