EXTINCT BATEACHIA. 



395 



ceeded by a supratemporal which narrows and becomes acute posteriorly, 

 being wedged between the parietal and what may be an anterior produc- 

 tion of the plate representing the epiotic. A very large jugal plate ex- 

 tends from the orbits two-thirds the distance to the extremity of the 

 quadrate, the remaining third being covered by a quadrato-jugal. After 

 the jugal, the epiotic is the largest of the cranial shields or bones, and 

 sends a prolongation forward between the parietal and supratemporal, 

 as well as on the outer side of the latter. The accompanying cut ex- 

 plains the relations of these bones. 



There is no trace of mucous canals. The sculpture consists of strong 

 ridges radiating and inosculating. Radiation is more uninterrupted on 

 both jugal, supratemporal, and anterior part of epiotic ; in the first they 

 originate in front of the middle exteriorly ; on the supratemporal near 

 the anterior part. The inosculation is honeycomb-like on the parietal, 

 supraoccipital, and posterior parts of epiotic. 



Length to middle of supraoccipital, .055 m. ; do. to angle of quadrate, 

 .0711 ; width at do.' do., .069 ; do. at orbits (approximate), .031 ; interor- 

 bital width, .0085. (See pi. 27, fig. 1.) 



No teeth are preserved with this cranium. The second specimen ex- 

 hibits nothing more distinctly than the one described. 



TUDITANUB EADUTUS, COPE (CKANIUM BEETOBED). 



TuDiTANUS MOEDAX, Cope (species nova). 



Represented by a partially complete cranium and some other frag- 

 ments. 



