Proceedings Am. Philos. Soc. Vol. LVIIt. 



Plate II 



A, ventral view of the anterior vertebrae of Perugia xanthus ; B, ventral 

 view of anterior vertebrae of Rhamdia cinerascens ; C and D, dorsal views of 

 skull of Perugia xanthus; E, jateral view of Perugia xanthus. 



I, Basioccipital ; 2, inferior process of post-temperal ; 3, ventral view of air 

 bladder capsule; 4, transverse process of fourth vertebra; 5, transverse proc- 

 ess of fifth vertebra; 6, transverse process of sixth vertebra; 7, transverse 

 process of seventh vertebra; 8, concentric process of tripus; 9, anterior proc- 

 ess of fourth vertebra; 10, posterior process of fourth vertebra; 11, nasal; 

 12, ethmoid; 13, lateral; 14, frontal; 15, sphenotic; 16, pterotic; 17, epiotic; 

 18, supraclavical ; 19, dorsal view of air-bladder capsule; 20, supraoccipital ; 

 21, neural spine of fourth vertebra; 22, sixth vertebra; 23, hyomandibular ; 

 24, metapterygoid ; 25, quadrate ; 26, preopercle ; 27, interopercle ; 28, opercle ; 

 29, clavicle; 30, end of air-bladder; 31, lateral view of air-bladder capsule; 

 32, fifth vertebra. 



