On Jurassic and Cretaceous fossils from North-East Greenland. 46.5 



The shell described seems to have great resemblance with 

 P. lamellosu Lahis., which I only know however from Lahlsk.ns 

 description and figure '. 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 3 is so badly preserved, that it is impossible to say 

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

 not seem to be the case. 



Distribution. North-East Greenland: "Kloft I" on Store Kol- 

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



22. Gervilleia sp. 

 A specimen of a small Gervilleia is so imperfect, 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. Ssenkning" on 

 Store Koldewey Island. 



23. Pecten (Entolium) demissus Bkan. 

 PI. XXXIII, fig. 8. 



(1829) 1835. Pecten demissus Bean; Phillips. Geology of Yorkshire, 1. PI. C, 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, DerJura, p. 353, 381 and 553; PI. 48, fig. (i 



and PI. 72, fig. 27. 

 186(>. — — Bean; Lindstrom, Trias- och Juraforsteningar fran Spetsber- 



gen, p. 14; PI. 3, figs. 9-10. 

 1809. — — Phill.; Brauns, Der mittlere Jura, p. 270. 



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



'?1883. — Bean; Lahusen, Jurass. Bild. des Rjasanschen Gouw, 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- 

 cular. The angle at the umbo ca. 120°. The ears extending somewhat 

 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 150 mm, breadth 27 mm; length of the cardinal margin 

 9 mm. 



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

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



1 Lahusen: Jurass. Bild. des Rjasanschen Gouv., p. 91; PI. 2, fig. 9. 

 - B. LoNDOBEN: Jurafossil fran Kap Stewart i Ost-Gronland, p. 202. 



