66 



The Calciferous species, which are certainly found in the Levis formation, 

 are Lingula MantelU, Camerella calcifera, and Fliurotomaria calciftra. 

 There are, besides these, a few which I do not consider to be positively 

 identified with Calciferous species, but which, nevertheless, in such speci- 

 mens as have been collected, agree so well with the figures in the Pal. N, 

 Y., that it would be unsafe to give them new names. They have been 

 referred by me heretofore to Ojjhileta imiangulata, 3Iaclurea matutina, 

 M. sordida and Holpea dilucula. 



Of Chazy species we find, at Phillipsburgh, the plates of a Cystidean, 

 which I cannot distinguish from those of Palceocystites tenuiradiatus, a 

 peculiar and remarkable fossil, and highly characteristic of the Chazy 

 limestone. It is, probably a distinct species, but in detached plates it is 

 imposssible to point out any difference. Camerella varians is also common 

 to the Chazy and Ldvis faunae. The remarkable genus Calathium is re- 

 presented in the L^vis formation by C. pannoswn, and in the Chazy by 

 C. Canadensis. This genus commences in the Calciferous, and runs up 

 to the Chazy. Ste^iopora fibrosa can scarcely be mentioned as a charac- 

 teristic fossil, but it is found in beds below the L^vis, and passes upwards 

 to the upper Silurian. There are no species common to the L^vis and 

 Trenton faunae, except the one last mentioned. 



It will be seen by referring to Art. 6, p. 207 and its continuation, 

 p. 361, that in Newfoundland the L^vis formation does not there imme- 

 diately overlie the true Calciferous, but is separated therefrom by two 

 other series of strata of considerable importance. The first of these, con- 

 sisting of Divisions I, K, L, M, is 1084 feet in thickness, and holds a fauna 

 which is, upon the whole, distinct from that of the Levis formation. The 

 trilobites are : 



Eathyurus 2 species. 



Bathyurellus 1 " 



Asaphus 1 " 



Illaenus 2 " 



Ampbion 1 " 



7 



Of these, Asaplms canalis and Ampldon Baro'andei occur in the L6vis 

 formation. Orthis Electra is also found in these beds ; but all the other 

 fossils are either new species, or species that occur in the Chazy and Cal- 

 ciferous. Overlying this series of strata is another 277 feet in thickness, 

 with a different fauna, the details of which will be found at the place cited. 

 Then follows 700 feet of sandstone, overlying which is the Ldvis formation, 

 at Cow Head. It would thus appear that the rocks at Point Ldvis not 

 only overlie, but, also, when the series is complete, are at least 2000 feet 

 above the true Calciferous. That so many trilobites belonging to the 



