WHITEAVES. 



CRETACEOUS FOSSILS PROM MANITOBA. 195 



posterior extremity, and its upper margin is armed with six teeth, the 

 largest of which is nine millimetres high and three mm. broad at the base. 

 The external surface of the dentary poi'tion of the lower Jaw (fig. 7a) is 

 finely ribbed in a longitudinal direction, and the summit of each rib 

 bears a single row of minute and closely arranged tubercles. One little 

 bone, (fig. 7c) which is very similar in its shape and in the' general style 

 of its dentition to the palatine bone of E. halocyon as described and 

 figured by Agassiz, but which is most probably one of the maxillaries, 

 has its under margin fringed with a single row of very minute teeth, 

 though these latter are of very nearly equal size, and not of distinctly 

 diiferent sizes as they are represented as being in the palatine bone of 

 E. halocyon. A long and slender tooth, (fig. 7b) whose longitudinally 

 striated exposed portion is fourteen millimetres long and only two mm. 

 broad at the base, to the basal portion of which a small fragment of 

 bone is still adherent, i.s evidently one of the elongated fangs at the 

 anterior extremity of the premaxillary. 



In 1875, the genus Enchodus wat^ included by Professor Cope in anew 

 family of physostomous fishes, for which the name Stratodontidas* was 

 proposed, an arrangement which has since been adopted by Zittel in 

 the third volume of his "Handbuch der Palajontologie.'' 



Cladocyclus occidentalis, Leidy. 



Plate 26, figs. 8 and 9. 



Cladocychix occidentalis, Leidy. 1873. Contr. Extinct Vert. Fauna West. Terr. 

 (Rep. U. a Geol. Surv. Terr., vol. I.) p. 288, pi. 17, figs. 

 21, 22, and pi. 30, fig. 5. 



Ochre Eiver, Township 23, Eange 17 W., eight specimens ; Edwards 

 Creek, Township 23, Eange 19 W., one specimen; Vermilion Eiver, 

 Township 25, Eange 20 W., one specimen ; EoUing Eiver, two miles 

 above the old C. P. E. crossing, four specimens ; and Favell Eiver, 

 Township 35, Eange 26 W., one specimen : .1. B. Tyrrell, 1887. 



Thunder Hill, Township 35, Eange 30 W., one specimen : D. B. 

 Dowling, 1887. All from the Niobrara group, or upper portion of the 



series. 



The name 0. occidentalis was proposed by Dr. Leidy for a number of 

 large, detached cycloid scales " found by Dr. John R. Evans and subse- 

 quently by Prof. Hayden and Mr. Meek in ash-colored shales of the 

 cretaceous series of Nebraska." " Mostly," Dr. Leidy says, " they are 



'Vert. Cret. Form. West. (Rep. U. S. Geol. Surv. Terr., vol. II.) p. 218. 



