On Jurassic and Cretaceous fossils from \ortii-East Greenland. 4(>i) 



The shell described seems to have great resemhhmce with 

 P. lamellosa Lahis., which I only know howevei- from Lahuskx's 

 description and ligure '. It lacks however the regular, sharp lines of 

 growth, has a straighter cardinal margin and seems to be less strongly 

 arched. The Perna mentioned by Lundgren from Cape Stewart in 

 East Greenland" is so badl}' preserved, that it is impossible to say 

 with certainty, if it is identical with P. (jvoenlandica; but this does 

 not seem to be the case. 



Distribution. North -East Greenland: "Klolt Г' on Store Kol- 

 dewey Island (15 valves, 6 of them connected in pairs). 



22. Qervilleia sp. 



A specimen of a small Gevvilleia is so im[)erfect, that a certain 

 determination of the species is impossible. The wing is comparatively 

 large; the hinge seems to have many ligamentary grooves. The 

 specimen was found in a loose-lying boulder at "4. Sænkning" on 

 Store Koldewey Island. 



2И. Pecten (Entolium) dem issus Вклх. 



PI. XXXIII, fig. .s. 



(1829) 1835. Pecten demissus Bean; Phillips. Geolog}' of Yorkshire, I. PI. 6, fig. 5. 



1836. Pecten demissus Phill. ; Goldfuss, Petref. Germ. II, p. 74; PI. 99, fig. 2. 



1854. — — — ; Morris and Lycett, Mollusca from the Great Oolite. 



Part. Ill, p. 127; PI. 14, fig. 7, 

 1858. — — — ; QuENSTEDT, Der Jura, p. 353, 381 and 553; PI. 48, fig. (i 



and PI. 72, fig. 27. 

 186(). — — Bean; Lindström, Trias- och Juraförsteningar från Spetsber- 



gen, p. 14; PI. 3, figs. 9—10. 

 1869. — — Phill. ; Brauns, Der mittlere Jura, p. 270. 



1881. — — — ; TuLLBERG, Aucellen-Schichten Novaja-Semljas, p. 24. 



?1883. — — Bean; Lahusen, Jurass. Bild, des Rjasanschen Gouv., p. 24 ; 



PI. 2. fig. 4. 



Only a single specimen can be referred to this species. 



The valve but slightly arched; circumference oval, very nearly cir- 

 cidar. The angle at the umbo ca. 120°. The ears extending somew^hat 

 out over the cardinal margin, small; cardinal margin relatively short 

 (ca. l/3rd of the whole breadth of the valve). Both the wings with 

 a blunt angle. Surface of the valve covered with fine, concentric 

 striae. 



Height 80 mm, breadth 27 mm; length of the cardinal margin 

 M mm. 



Distribution. North -East Greenland: in a boulder on the 

 east side of Harefjæld at Danmarks Havn (1 spec). 



' Lahusen: Jurass. Bild. des Rjasanschen Gouv., p. 91; PI. 2, lig. 9. 

 - В. Lundgren : Jurafossil från Kap Stewart i Ost-Grönland, p. 202. 



