66 



The Calciferous species, which are certainly found in the Le>is formation, 

 are Lingula Mantelli, Carrier ella calcifera, and Pleurotomaria calcifera. 

 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 OpTiileta <uniangulata, Maclurea matutina^ 

 M. sordida and Holpea dilucula. 



Of Chazy species we find, at Phillip sburgh, 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 LeVis faunas. The remarkable genus Calathium is re- 

 presented in the LeVis formation by O. pannosum, and in the Chazy by 

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

 to the Chazy. Stenopora fibrosa can scarcely be mentioned as a charac- 

 teristic fossil, but it is found in beds below the LeVis, and passes upwards 

 to the upper Silurian. There are no species common to the LeVis 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 Lie* 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 : 



Bathyurus 2 species. 



Bathyurellus 1 " 



Asaphus 1 lt 



Illamus 2 " 



Amphion 1 " 



7 



Of these, Asaphus canalis and Amphion Barrandei occur in the Ldvis 

 formation. Orthis Electro, 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 LeVis formation, 

 at Cow Head. It would thus appear that the rocks at Point LeVis 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 



