416 M. R. Thorpe — Leptauchenia Leidy and 



occipital condyles and the incisor border. The individual 

 is fully adnlt. The specific name is given in honor of 

 Professor Charles Schuchert as a token of appreciation 

 of his generosity to the Division of Vertebrate Paleon- 

 tology, in the apportionment of funds. 



This species resembles Cyclopidius decedens {C. heter- 

 odon) in two characters. Both species are smaller than 

 C. simuSy and both have the same antero-posterior diame- 

 ter of P*, but not the same transverse diameter. All the 

 species of Cyclopidius are considerably larger than this 

 and smaller than Cyclopidius hdUaniis, sp. nov. From 

 other dimensions of C. decedens, it is apparent that this 



Fig. 4. — ChelonocepJialus schuclierti, subgeu. et sp. nov. 

 eral view of skull. Nat. size. 



Holotype. Lat- 



new species is not only smaller, but differently propor- 

 tioned. 



Distinctive Characters. — Great relative bizygomatic 

 diameter, giving the skull a strong brachycephalic appear- 

 ance. In fact, it is roughly circular in outline, superfi- 

 cially resembling that of the Chelonia. The zygomata 

 are relatively heavy, although not very thick except near 

 and at their origin above M^ and the anterior part of M^. 

 The orbits look outward and upward. The sagittal crest 

 is long and high, while the brain-case is relatively large. 

 The sagittal crest is marked by a foramen produced by a 

 spreading of the parietal bones, about on a line above the 

 paramastoids. The frontals are narrow and the facial 

 vacuities large. The basicranial area is foreshortened, 



