704 E. C. CASE 



Sagenodus vabasensis Cope. Plate I, Fig. 7. 



Ctenodus vabasensis Cope, 1883, Proc. Phil. Acad. Nat. Sc., p. 



1 10. 

 Sagenodus vabase?isis Woodward, 1891, Cat. Foss. Fishes 

 Brit. Mus., Pt. II, p. 261. 



Sagenodus vabasensis Williston, 1899, Kans. Univ. Quart., 

 Series A, p. 176. 



"This fine species is represented by an almost perfect tooth. It is allied 

 to the C.fossatus Cope', but is wider, and the crests do not radiate so equally, 

 but are chiefly directed in one direction, as in most species of the genus. The 

 C. gurleiatius and C. pusillus are at once distinguished by the small number 

 of crests, while the C. fteriprion and C. dialophus have a larger number of 

 crests, and are otherwise different. C. ftorrectus differs less from it, but has 

 only five \ crests, while C. vabasensis has six \. The \ represents the small 

 posterior (?) crest, which is double. This, with the next one, is directed 

 slightly posteriorly ; the fifth is at right angles to the long axis, and the ante- 

 rior four extend more or less forwards. They are serrate nearly to their 

 bases, but the teeth are obsolete on their basal halves. The straight part of 

 the internal edge extends as far forwards as the fourth crest, and is continued 

 posteriorly as a short process. No fossae at ends of crests. Superior face 

 of tooth wide and slightly concave. The anterior part of the first and second 

 crests are broken away, so that it is impossible to say whether they are pro- 

 duced as in C. ftorrectus" 



MEASUREMENTS. 



" Length to marginal base of second crest - - .024 m 



Width at marginal base of second crest - - 009 



Width at fourth crest, inclusive of apex - - .015 



Width of posterior side - - - - - .010 



Thickness at base of fifth crest - - - .005 " 



[No. 6510.] 



Sagenodus gurleyanus Cope. Plate I, Figs. 8a, Sb, Sc. 



Ctenodus gurleyanus Cope, 1877, Proc. Am. Phil. Soc, p. 55. 

 Sage?wdus gurleyamis Woodward, 1891, Cat. Foss. Fishes 



Brit. Mus., Pt. II, p. 261. 

 Sagenodus gurleya7ius Williston, 1899, Kans. Univ. Quart., 



Series A, p. 176. 



"This species is indicated by a portion of a tooth, which leaves the num- 

 ber of the ridges a matter of uncertainty. On this account its description 

 might have been postponed, but that the distinctness of its characters render 

 it clear that it cannot be placed with any other species. The crown, as in 

 Ceratodus (Sagenodus) paucicristatus, is narrow and rather thick ; but three 



