194 The Ottawa Naturalist. [Feb. 



8. Pure, buff colored limestone full of Tet- 

 radium cellulosum and T. columnare. 



Top of Lowville 3 17 



7. Pure, buff limestone with numerous 



molluscan fossils 2 10 19 10 



6. One layer rather coarse grained limestone. 



Full of fragments of Bathyurus spiniger. 10 20 8 

 5. Thin-bedded blue and buff limestone; 

 numerous specimens of Bathyurus ex- 

 tans in the upper part 7 6 28 2 



4. Blue-black limestone with Tetradium 



cellulosum and Stromatocerium 1 29 2 



3. Light gray limestone with numerous 



limestone pebbles and mollusca 4 29 6 



2. Dark gray limestone, the surface covered 



with Beatricea 10 30 4 



1. Dark gray limestone full of large fiat 



limestone pebbles and many fossils. . . 1 9 32 1 

 The Fauna. 

 At a number of horizons fossils are quite abundant, but as 

 they do not weather out readily they are not easily obtained in 

 identifiable condition. . '^^ 



From the sandstone and shale of the lower part of the 

 sections at Aylmer, Britannia, Deschenes and RockcHffe, the 

 following species are known: 



Hebertella imperator, Ctenodonta parvidens, 



Camarotoechia plena, Archinacella deformata, 



C. orientalis, Raphistoma striatum, 



Lingula lyelli, Lophospira hillingsi, 



Glossina belli, Jsotelus arenicola. 



At Aylmer, about 80 feet above the base of the section the 

 following species were collected by Mr. T. W. E. Sowter: 

 Lingula lyelli, Ctenodonta parvidens. 



Camarotcechia plena, Modiolopsis sowteri. 



From the greenish limestone above the shale and sandstone 

 at the Hogs Back and elsewhere we have only : 



Glossina belli, Hebertella borealis, 



Camarotoechia plena, Isotelus sp. ind. 



In the clavigera zone or in the limestone and sandstone 

 within 20 feet above it we find: 



Modiolopsis parvittscula. Isochilina Ottawa, 

 Sowteria canadensis, Isochilina? clavigera, 



Helicotoma whiteavsiana, If clavigera clavifracta, 

 Loxoceras sp. ind., Primitia logani, 



Bathyurus angelini, Leperditia canadensis, 



Leperditella labellosa, L. amygdalina. 



