498 HE JOURNAL OF GEOLOGY. 



parisons of the above table. As the comparisons have only 

 been made from figures it is quite possible that the first five 

 forms may prove to be representatives of North American 

 types. The sixth by the circular form of its whorls and central 

 position of the smooth spiral band differs from any species 

 known to me. 



Murchisonia. — Two of the species belong to the section of the 

 genus characterized by a strong angular carina represented in 

 North America by M. copel, White, and M. nebrascensis, Geinitz, 

 with the former of which one of the Brazilian forms may prove 

 to be identical. The third resembles in form and ornamentation 

 Turetella (?) stevenso?vi, Meek & Worthen, but has the spiral 

 band of Murchisonia. 



Loxojiema sp.— -Similar to but probably not identical with L. 

 scitula, Meek. 



Aclis sp.- — Similar to but probably not identical with A. ste- 

 vensana, Meek & Worthen. 



Naticopsis nana, Meek & Worthen. The Brazilian specimens 

 are larger than those figured in the Geology of Illinois but show 

 no essential differences from specimens from other North 

 American localities. 



Naticopsis (?) sp. — A peculiar little shell with a form like 

 Ampullaria and indistinct indications of a spiral band which, if 

 not deceptive, would place it in Plenrotomaria. 



Polyphemopsis sp. A medium sized shell with a deep suture 

 and elongated volutions, giving it the aspect of certain Silurian 

 forms for which Conrad proposed the name of Subulites. 



Polyphemopsis sp.- — An elongated form somewhat similar to P. 

 peracnta, Meek & Worthen, but too imperfect for identification. 



Polypliemopsis (?) sp. — A subglobose form resembling P. ifior- 

 nata, Meek & Worthen, and which may prove to be Machrocheilus. 

 A small specimen in chert shows traces of color. 



Euomphahis . — Two species occur. One with angular whorls 

 is of the type of E. pentangiilatus, Sow.; the other with elevated 



