S'lhirian Fossils of Canada. 



169 



This species agrees exactly with B. Argo in all respects ex- 

 cept in being only one half the thickness and in having the umbi- 

 licus a little larger. It is also closely allied to B. acutus Sowerby 

 but that species is, according to Sowerby and McCoy only six or 

 seven lines in diameter and nearly half as much in thickness. 



Locality and Formation. — Blue Point Lake St. John's. Black 

 River and Birdseye Limestone. 



Collector. — J. Bichardson. 



Bellerophon Charon. N. s. 



Fig. 14. 



Fisr. 15. 



Fig. 14. — Bellerophon Charon, Side view. 

 15. — Front view. 



Description. — Sub-globular with a widely expanded aperture; 

 diameter about an inch. Whorls about three each concealing 

 half of the one next preceding it. Dorsum broadly rounded ; a 

 scarcely perceptible angulation along the median line, on each side 

 of which, especially towards the aperture the shell is in some speci- 

 mens very slightly flattened. The umbilicus is deep, penetrating 

 to the centre, exposing all the whorls, the inner ones only obscurely 

 seen, owing to their being imbedded in those preceding them. The 

 sides encircling the umbilicus narrowly rounded, not angular. The 

 aperture is very much expanded transversely, widely auriculated 

 on each side, the width being about three times the height ; the 

 ventral side indented by half the thickness of the preceding whorl 

 and the dorsal border apparently with a wide though not very deep 

 emargination. The surface apparently nearly smooth or only 

 very finely striated. 



Diameter of a nearly perfect specimen, measured from the mid- 

 dle of the dorsal lip through the aperture to the opposite side, one 

 inch ; width of aperture at base sixteen lines ; height of aperture, 

 five lines ; width of last whorl at the entrance of the aperture, five 

 lines ; diameter of umbilicus, three lines. A cross section of the 



