'178 



Ostrea sp. cf. edldiformis. Schlotheim. 

 PI. VII, figs. 4 and 5. 

 1820. Schlotheim, E. F. Die Petrefactenkunde etc. Gotha, p. 233. 



A few of the Ostrea-she\\& from Mount Nathorst are more 

 convex than the typical Ostrea eduliformis. unfortunately the 

 largest of these are in a very fragmentary condition so that it 

 is not possible to identify them with certainty. A small, fairly 

 complete specimen with both valves (pi. VII, fig. 5) resembles 

 very closely an и Ostrea cf. explanata^ Goldf.» from the 

 Bathonian beds of Boulogne, which is preserved in the Munich 

 Collection. 



Ostrea sp. cf. sandalina. Goldfuss. 



1834 — 40. Ostrea sandalina. Goldfuss, A. Petrefacta Germanise. Düssel- 

 dorf. Theil 2, p. 21, tab. 79, fig. 9. 

 1849. Ostrea sandalina. Rouiller. Bulletin de Moscou, t. N., fig. til. 



In the pebble which was found by Hartz on July 3P* on 

 the seashore near Dinosaurus River and which has already 

 been mentioned as containing a cast of Limea duplicata., Sow., 

 fragments of a species of Ostrea also occur. These resemble 

 very closely the specimens from Cape Stewart in the Copen- 

 hagen Collection, which have been determined by Lundgren^) 

 as Ostrea sandalina (cf. sandalina Goldf.). Lundgren's specimens 

 of Ostrea sandalina were found in the grey sandstone of Cape 

 Stewart in Jameson's Land, which has been referred by Lund- 

 gren to the Callovian. 



Aucella. Keyserling. 



Aucella Palla^ii. Keyserling. 

 Pi. VI, fig. 7. 



1846. Keyserling, A. und Krusenstern, P. Wissenschaftliche Beobacht- 

 ungen auf einer Reise in das Petschora-Land im Jahre 1843. St. 

 Petersburg, p. 299, tab. XVI, fig. 1—6. 



1888. Lahusen, J. Ueber die russischen Aucellen. St. Pétersbourg. Mém. 

 Com. Géol. vol. III, no. 1, p. 34, tab. I, fig. 12—27. 



Lundgren, В. 1895, p. 197. 



