194 Annals of the Carnegie Museum. 



lip is at right angles to the upper lip or upper surface of the whorl, 

 but this angle decreases as we follow the margin of the whorl back- 

 wards toward the apex, at such a rate that, at the commencement of 

 the last whorl, it is not more than 75 . 



"The surface is covered with coarse, but only slightly elevated 

 undulations of growth, the width of which is from one-sixth to half a 

 line. Besides these it is striated with fine lines of growth, of which 

 there are about ten or twelve in the width of one line. On the upper 

 surface the striae and undulations turn backwards at an acute angle 

 from inner to the outer edge of the whorl. On the lower surface they 

 curve forward and then backwards. 



"The shell in the spire is thin, but below very thick. When the 

 shell has been totally destroyed, the cast of the interior exhibits an 

 umbilicus one-eighth of the whole width of the spire." 



Locality. — In the Chazy Limestone near L' Original, Canada. 



Family Bellerophontid^e McCoy. 



Genus Bucania Hall. 



Bucania sulcatina (Emmons). 



(Plate XLIX, figures 15-17 ; Plate L, figures 3, 4 ; Plate LV, 

 figures 13, 14.) 



Bellerophon sulcatinus Emmons, 1842, Geology of New York, Report 

 of the Second District, p. 312. 



Bucania sulcatina Hall, 1847, Paleontology of New York, Vol. I, p. 

 32, PI. 6, figs. 10, \°a; PI. 33, fig. 4a 7 . 



Bucania rotundata Hall, 1847, Paleontology of New York, Vol. I, p. 

 33; PI. 6, figs. 11^. 



Bellerophon sulcatinus Emmons, 1855, American Geology, Vol. I, PI. 

 4, fig. 4. 



Bucania sulcatina Waagen, 1880, Paleontologica Indica, Series XIII, 

 part 2, p. 131. 



Bucania sulcatina Ulrich and Scofield, 1897, Paleontology of Minne- 

 sota, Vol. Ill, part 2, pp. 850, 883. 



Bucania champlainensis Whitfield, 1897, Bulletin of the American 

 Museum of Natural History, p. 181, PI. 4, figs. 14-16. 



Bucania champlainensis Raymond, 1902, Bulletin of American Paleon- 

 tology, Vol. Ill, No. 14, p. 305, PI. 18, figs. 7, 8. 

 A careful study of a large series of the common Bucanias of the 





