Amia whiteavesiana, Sp. nov. 



Founded on an anterior vertebra of large size, which differs in various respects 

 from that of the Eocene species. There are no diapophyses, and there are tuberosities 

 external to and adjoining the neurapophysial facets. The latter are so much worn that 

 it is impossible to make out their character. There is a minute, round notochordal 

 foramen above the middle of the centrum. In outline the centrum is a tranverse oval, 

 more transverse than in any other species of the genus at present known. External walls 

 smooth. Two fossse, separated by a narrow median rib, on the inferior surface. 



Measurements. 



Mm. 

 f Anteroposterior 9 



I 

 Diameters of centrum \ Vertical 26 



I 



l_ Transverse 40 



This species is dedicated to Mr. J. F. "Whiteaves, of Ottawa, the distinguished palaeon- 

 tologist of the Geological Survey of Canada. 



Amia macrospondyia. Sp. nov. 



This species is also indicated by an anterior vertebra. It agrees with the last in lack- 

 ing diapophyses, and in having a mmi\te foramen corda-dorsalis, which is, however, nearer 

 the middle of the centrum than in the A. whiteavesiana. The A. macrospondyla differs much 

 from the latter in its proportions. The vertebra, while absolutely smaller, has a larger 

 anteroposterior diameter, as shown by the measurements below. The neurapophysial 

 facets are too much worn for description. The wearing has left the appearance of a pair 

 of parallelogrammic fossee at opposite positions of the external wall of the centrum. 

 "Where unworn, the surface displays delicate wrinkles in the direction of the long axis of 

 the vertebral column. 



Measurements. 



Mm. 

 f Anteroposterior 12 



Diameters of centrum -[ Vertical 22 



I 



[ Transverse 26 



NEMATOGNATHI. 

 ? RHINEASTES, Cope. 



A species of Siluroid is referred with doubt to this genus, since the parts essential 

 for exact determination are wanting. The disposition of the tissue of the vertebral cen- 

 trum is in vertical laminae, parallel to those of the articular faces, as is the case with such 

 vertebrae of Rhineastes as are known. Diapophyses are present, and the neurapophyses 

 are coossified with the centrum. The lateral walls of the centrum below the diapophysis 

 are not excavated by fossae. 



This genus has been known hitherto from the Eocene only. 



