1877.] Lob [Cope. 



Suchoprion cyphodon, gen. et sp. nov 

 Char. gen. As no portion of the animals referred to this genus is known, 

 other than teeth, the characters are derived from these only. Their 

 crowns are elongate, conical and curved, and are furnished with denticu- 

 late cutting edges. In the teeth preserved these are separated by very un- 

 equal extents of surface, as they form the anterior and posterior borders of 

 the inner face. The crown is penetrated by a very minute pulp cavity, 

 and it consists of a number of distinct concentric cones. 



It is probable that teeth have been discovered in Europe which belong 

 to saurians of this genus, but I cannot find that they have ever received a 

 distinctive name. They resemble those of Crocodilia rather than Dino- 

 sauria. 



Char, specif. The only species of Suchoprion as yet known to me is 

 represented by four teeth found in the same beds and formation as those 

 above described. One of these is of large size, indicating that it reached 

 the adult dimensions of the Gangetic gharrial. They display some differ- 

 ence in the degree of convexity of the external surface, which is some- 

 times opposite the imaginary plane of the inner face, sometimes oblique to 

 it. The degree of convexity is always greatest at the base of the crown. 

 The inner face is also convex. The curvature in the long direction is not 

 great, and is directed to the inner side. The surface presents a minute 

 silky sculpture ; one tooth presents a very few shallow sulci. 



Measurements. M 



( antero-posterior C21 



Diameter of largest tooth < . , ~ „ 



Length of crown of tooth No. 2 045 



f antero-posterior 009 



Diameter crown tooth 2 } transverse 016 



• Belodon carolinensis, Emmons. 

 Cope, Trans. Amer. Philos. Soc. 1869, p. 59. 



Teeth of the anterior portions of the jaws were obtained by Mr. 

 Wheatley. 



Belodon priscus, Cope. 



Trans. Amer. Philos. Soc. 1869, p. 59. 



Teeth from the anterior part of the jaws. In addition to the six species 

 of saurians above noted, Mr. Wheatley obtained the tooth of a Stegoce- 

 phalous Batrachian, probably a Labyrinthodont. 



Cricotus gibsonii, Cope, sp. nov. 

 While examinations into the Clepsydrops shale of Eastern 'Illinois have 

 revealed a great abundance of individuals, and three species of Olepsydrops, 

 the genus Cricotus has remained without addition, and the three vertebrae 

 hitherto found, appear to belong to but one species, the G. heteroclitus. The 

 present notice describes a second form, represented, like the first, by but few 



PROC. AMER. PHILOS. SOC. XVII. 100. X. PRINTED NOV. 20, 1877. 



