5. "THE LOWER SANDSTONES OR SUBDIVISION E." 



Fourteen species of fossils were collected by Dr. Dawson in these 

 deposits, but three of the former are too imperfect to be determined. 

 Of the eleven species which remain, five, namely, Pleutomaria Skidega- 

 tensis, Pleuromya subcompressa, var. kevigata, Nemodon Fischeri, Oxyloma 

 mucronata and Litlwdoraus Maudensis, occur also in the Lower Shales, 

 especially towards or at their basal portion : one is doubtfully identi- 

 fied with the Ammonites Requienianm of d'Orbigny, which is probably a 

 Sphenodiscus : and five (viz., Schloenba'.hia propinqua, Cardium tumicMum, 

 Pecten Carlottensis, Rhynchonella Maudensis, and Discina semipolita) are 

 here described and figured as apparently new. 



As nearly one-half of the species collected in subdivision B are also 

 found in subdivision C, it is upon the whole most likely that the Lower 

 Shales, the Agglomerates and Lower Sandstones of Dr. Dawson's report, 

 are all merely local and subordinate subdivisions of the same formation, 

 and that the three together represent the lower half of the Middle 

 Cretaceous at this particular locality. It is to be noted, however, that 

 the two Ammonites which occur in the Lower Sandstones are quite 

 different from any of the species found in the Lower Shales. 



ADDENDUM. 



TRIGONIA INTERMEDIA, Fahrenkohl. 



Lyriodon intermedium, Fahrenkohl. 1841. 



Lyrodon darellatuft, G. de Fischer. 

 Trigonia darellata, d'Orbigny. 



Trigonia intermedia, Eichwald. 



Trigonia Dawsoni, Whiteaves. 



" " Whiteaves. 



einige Fossilien der mos- 



kausch u. kalug. Gouv. voy., 



Bull de Mosc." Vol. iv. p. 796, 



pi. 19, fig. 2. 

 1853. Bull de Mosc, Vol. 1, p. 127. 



(En partie). Pale"ont. de Eussie, 



&c., p. 460. 

 1867. Lethaea Rossica, Vol. 2. Sect. 1, 



p. 601, pi. 24, figs. 13 a and b. 

 1878. Geol. Surv. Can., Rep. Progr. 



1876-77, pp. 154 and 155. 

 1884. This Volume, p. 231, pi. 31, figs. 



1 and la. 



Since the third sheet ofUhe present report was issued, the writer has 

 ascertained that the Trigonia Dawsoni is almost certainly identical with 

 the above named Russian Neocoraian species. 



