562 PALjEONTOLOGICAL report of geological survey. 



Grayviilensis, Lozonema, species undetermined, Orthoceratite, species 

 undetermined, Ckonetes mesoloba, (variety small, and prominently 

 lobed,) Productns equicostatus, and Bellerophon carbonarious. This 

 Bellerophon, which we propose to call B. carbonarious, has generally 

 been refered to B. Urei, Flem., by western Palaeontologists — a con- 

 clusion with which we cannot agree ; not from a desire to create a new 

 species, but with a view to a proper understanding of the true geolo- 

 gical position of the shells of the Coal Measures. The B. Urei, accor- 

 ding to L. De Koninck, has a vertical range from the silurian to the 

 carboniferous beds, whereas the B. carbonarious has not been found to 

 range lower than the middle of the coal basin, and is only fully rep- 

 resented in the upper part. It certainly approaches very close to L. 

 De Koninck's description of the B. Urei, (Description Animaux Fos- 

 siles, page 356, pi. xxx, fig. 4,) and may possibly be a variety, but 

 cannot be considered identical. That there are several varieties or 

 species referred to this shell, is evident from the description of the 

 following authors here cited : Capt. Portlock, Geology of Londonderry, 

 page 400; Mr. Phillips' Geology of Yorkshire, page 231 ; McCoy's 

 Description of British Palaeozoic fossils in the Geological Museum of 

 Cambridge, page 555; all of which differ materially. It is referred to 

 B. Urei by Norwood and Pratten; Notice of fossils from the carbonif- 

 erous series of the western states ; Journal Acad. Nat. Sci., June, 1855; 

 page 75, plate IX., fig. 6. The original of this figure is in my cabinet, 

 and was loaned to them for representation, being at that time the only 

 perfect specimen known. I an sorry to say, from some over-sight, for 

 it was in the hands of a most excellent artist and esteemed friend, this 

 figure gives a very inporrect idea of the shell ; it exhibits but two- 

 thirds of the true number of the spiral striae — having only fifteen, 

 whereas, there should have been twenty ; (from the examination of a 

 large number, they are found to range from 19 to 25 ;) the mouth, as 

 well as the general contour, is essentially wrong. None of the various 

 authors who have described the B. Urei mention the lateral expansion 

 of the mouth into ears, a feature very decided in our shell. It alsq 

 differs in having fewer spiral striae, and by the more rapid increase of 

 the last whorl. From the examination of several hundred good spe- 

 pimens, the average number of spiral striae appears to be twenty-one, 

 always, even in the youngest individual, terminating on the inferior 



