Cope.] 508 [April 5, 



crown is much more elevated than that of the tooth first described, and is 



in general shaped like a claw. It may be from the pterygoid bone of 



another genus. 



Measurements. M. 



Elevation of crown (axial) 010 



_ . „ ( anteroposterior 006 



Diameter of crown < nnc . 



( transverse 008 



Pariotichus brachyops. Gen. et. sp. nov. 

 Char. -Gen. This form is represented by a cranium whieh has lost its 

 superficial osseous stratum at some points, and the entire occipital region. 

 The temporal fossae were covered by a roof continuous with the postorbital 

 region ; the zygomatic arch extends low down, producing a resemblance 

 to certain tortoises. The orbits are small and lateral, and the muzzle is 

 short, with terminal nares. Their exact character cannot be ascertained. 

 The teeth are rooted, and have compressed obtuse crowns, Avith cutting 

 edge ; they diminish in length posteriorly, and do not display any elongate 

 canine. The cranial bones do not exhibit any sculpture. 



This genus is quite distinct from the others here described from corres- 

 ponding parts of the skeleton. In the constitution of the skull it resem- 

 bles Prof. Owen's genus KisticepJialus from supposed Triassic beds of South 

 Africa, but differs totally in dentition. 



Char. Specif. The interorbital width is twice the diameter of an orbit, 

 and is nearly flat. The cheeks behind the orbits are swollen ; the canthus 

 rostralis is obtuse. The muzzle is obtuse, broadly rounded, and somewhat 

 depressed ; the nostrils were not large. The orbits are subround, and meas- 

 ure one half of the length of the muzzle measured axially above. The 

 mandibular rami are not deep. The longest teeth are below and in front 

 of the anterior border of the orbit ; posterior to this point they diminish 

 rapidly, and are reduced to a very small size. The crowns of the greater 

 number of the teeth are short and much compressed, and 'the enamel is 

 coarsely longitudinally grooved. An anterior mandibular tooth has a sub- 

 conic crown. 



Measurements. . M. 



Width of skull at parietal region 020 



Length " from " 022 



Interorbital width ^ 010 



Four teeth in 004 



Length of root and crown of a tooth .002 



From the locality of the last species. 



Ectocynodon ordinatus. Gen. et sp. nov. 

 Char. Gen. Cranium short and wide, with large post-frontal bones and 

 a large orbit. Cranial bones sculptured, but no lyra. Teeth rhizodont, 

 with elongate compressed crowns with anterior and posterior cutting 

 edges. One of these between the orbit and nostril larger and longer than 

 the others, and lying outside of the closed dentary bone. Mandibular 



