177' 



Ostrea. Linné. 



Ostrea eduliformis. Schlotheim. 

 PI. VU, figs. 1—3. 



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

 1834 — 40. Ostrea explanata. Goldfuss, A. Petrefacla Germanise. Düssel- 

 dorf. Theil 2, p. 22, tab. 80, fig. 5. 



A large number of oyster-shells have been collected from 

 Mount Nathorst. These occur mainly in an oyster-bank, i. e. a 

 bed which consists almost exclusively of oyster-shells , held 

 together by a brown sandy cementing material. A few shells 

 occur in the brown sandstone and in the crinoid-sandstone. 

 Most of the better preserved shells resemble very closely Ostrea 

 eduliformis Schloth. They have the same broad hinge-line, 

 drawn out into a point above , the same rounded anterior 

 border and the same concave posterior border with a wing -Ике 

 prolongation below. The position of the muscular impression 

 is also identical. The shell figured on pi. VII, fig. 3, except 

 that it is smaller, is very like a specimen from the Knorrii-beds 

 of the canal near Hildesheim, which is to be seen in the Palse- 

 ontological Collection at Munich. Other specimens in the Munich 

 Collection are also very similar to the Greenland ones. 



The largest of the specimens from East-Greenland is lO^"^'^ 

 in length. 



Ostrea eduliformis (typ. and var. trigona Schlippe) occurs, 

 according to Schlippe ^), in the Subfurcatum-beds, in the «Haupt- 

 rogenstein (Great Oolite) and Cornbrash of Baden, in the 

 « Hauptrogenstein » and Cornbrash of Alsace, in the «Hauptrogen- 

 stein» and the Varians-beds of Western Argau, in the «brown 

 Jura â» of Swabia and in the Parkinsoni-zone of North-west 

 Germany. Schlosser-) quotes it from the «brown Jura d» 

 (Humphriesianum-zone) of Franken and of Oberpfalz. 



') Schlippe, О. 1888. Die Fauna des Bathonien im oberrheinischen Tief- 

 lande. Abh. zur geol. Specialkarte von Elsass-Lothringen. Strassburg. 

 - Band IV, Heft IV, p. 21, 34, 54, 67, 110. 

 2) Schlosser, M. 1901, p. 552. 

 XXIX, 1 2 



