235 



Measurcmentu of No. 3. 



M. 



Lcugtb of cightocu of tUu dorsal vcrtobraj 0.275 



Lougtii of cigliteoii of tlm camlal vortebno 0.320 



i)ei)tb of tho head at the opLiciiIar boiiUrs 0. 155 



Longitiuliiial width of the opciciihi.ii 0.050 



Lcugtb of tho abdoiiiiual dermal scutum 0. 050 



Width of the abdouiiual dermal scutum 0.014 



Numerous specimens from Professors Merrill and Miulge, and collected 

 by myself during the expedition of 1871. 



PIIASGANODUS, Leidy. 



The characters of this genus are as yet but little known; but isolated 

 teeth may be known by the existence of a straight cutting-edge in front, and 

 shorter one extending downward from the apex behind, to different lengths 

 in the different species. The form is near to Enchodus, especially in the 

 elongate anterior teeth; bul, in that genus, the long teeth have unsymmetrical 

 cutting-edges, which are not in the long axis of the dentary bone. 



PlIASGANODUS CAEINATUS, Cope. 



Founded on a shed example of one of the long teeth, taken from the 

 matrix attached to the dorsal vertebrae of the Elasinosaurus i)latyurus. The 

 tooth is more elongate in outline than that of the S. speciosa, Leidy, l. c; more 

 than twice as long as wide at the base. The anterior margin is the more 

 oblique, and its smooth lace is margined by a faint line posteriorly, and is 

 continued to the extremity. The convex inner face of the tooth behind is 

 sculptured witli a few fine deep grooves, whicli are separated by acute ridges, 

 which do not extend over more than half the length of the tooth. Length, 

 three lines. 



From the Upper Cretaceous of the neighborhood of Fort Wallace, Kans. 



PlIASGANODUS GLADIOLUS, CopC. 



Represented by a single elongate tooth, which is iiit«rmediate in charac- 

 ter bctwceti those of the two species last described, but much larger than 

 either. It is large for an anterior maxillary tooth of I'hasganodus anceps, 

 and, should it pertain to the end of the mandibular series, will in so far 

 resemble the genus E)icltodiis; but the cutting-edges an; opposite to each 

 other, and not, as is usual in that genus, on one side, leaving tlie inner iiiee 

 very convex. Li this species, the crown is rather slender, and compressed 



