214 



is deep, and continued to near the symphysis. The cotylus of the articuhir 

 bone is j)rescnved largely backward. 



The prcinaxillary is a large oval plato, gently convex on the outer side, 

 and of greater vertical than transverse extent. It differs from that of Porlheus 

 in lacking the condyle on the superior border. In the best-preserved speci- 

 men, a large piece is broken from its posterior alveolar border ; in that which 

 remains, nine alveoli remain. 



In two of the specimens, the anterior part of the cranium is preserved. 

 The anterior part of the ethmoid is broad and convex above, and rapidly 

 contracts to an acute, flat apex. Laterally, it overhangs the fossa in whicli 

 the anterior maxillary condyle enters, atul furnishes a flat surface for the 

 posterior condyle of the same bone. The vomer is excavated laterally in 

 front, .so as to be somewhat cross-shaped, the apex being rather produced. 

 It is edentulous. 



Measurements. 



M. 



No. 1, depth of the iirom.axillary 0.054 



No. 1, depth of the maxillary at the middle 0.025 



No. 1, depth of the triaugiilar bone of the palate 0. 038 



No. 1, depth of the aympbysis of the mandibuli 0.026 



No. 2, length of three anterior vertebra; « 0.040 



No. 2, diameter of ouc anterior vertebra - 0. 010 



No. 2, depth of the dentary 0.041 



No. 2, depth of the .symphysis 0. 02G 



Fo. 2, width of the ethmoid aliovo 0. 0105 



No. 2, width of the craiiinm at the i>refroutal facets 0.022 



No. 2, length of the muzzle to the prefrontal facets 0.023 



A third specimen consists of some vertebrae and portions of the cranium; 

 the latter including the dentary, maxillary, part of the premaxillary, the 

 palatine and vomerine bone;?, compressed into a mass by pressure, the 

 separate pieces preserving nearly their normal relations. From the, latter, 

 the following characters may be derived : 



Palatine bones toothless; teeth of both maxillary and dentary with 

 compressed crowns, wiiich are longer than wide at base, and closely placed; 

 those of the dentary twice as large as those of the maxillary. Maxillary bone 

 proximally deep ; dentary shallower; the maxillary with elongate suture with 

 the premaxillary behind. 



The teeth are equilateral, without intermarginr.l groove or barb, and with 

 smooth enamel- surface, or only minutely striate under the microscope. 

 A series of larger foramina extends along the alveolar margin of the maxil 



