On Jurassic and Cretaceous fossils from North-East Greenland. 4(57 



In addition to the species of Pecten mentioned above, the Dan- 

 mark Expedition has also brought home .5 others horn the Jurassic 

 deposits in North-East Greenland. One was found in "Kloft II" on 

 Store Koldewey Island ; it is a shell of medium size, somewhat arched 

 and with smooth surface. — The second species is fairly strongly 

 arched and has had somewhat coarse radial ribs; it was found in a 

 boulder of coarse-grained, gray sandstone lying at a height of 45 m 

 above the sea down from "Tnekpasset" on Store Koldewey Island. 

 Lastly, in the sandstone from the top of Muschelberg on Hochstetter's 

 Foreland a fragment was found of a cast of a left valve; the form 

 of the ears shows, that this valve belongs to a species different from 

 those described in the foregoing. 



The imperfect state of preservation of all these shells prevents 

 an exact determination. 



29. Ostrea sp. 



A few, more or less incomplete [shells of an Ostrea of but little 

 characteristic form were found at "Kloft I" on Store Koldewey Island. 

 A couple of them seem partially to agree with 0. klutroschovensis 

 Rouill., but the imperfect material does not permit of a certain 

 determination. The same applies to fragments of an Ostrea shell from 

 "4. Samkning" on Store Koldewey Island. 



From the sandstone from the top of Muschelberg on Hochstetter's 

 Foreland there is a cast of a single, large Ostrea valve. — Here also 

 the species cannot be determined. 



Probably these Ostrea fragments represent several species. 



30. Modiola Strajeskiana d'Orbigny sp. 



PI. XXXIII, fig. 9. 



1845. Mi/tilusStrajeskianas d'Ohbigny in Mlhch., Vekneuil et Keys., Geol. de la Russie 



dEurope, II, 3., p. 4<>3; PI. 39, figs. 22-23. 



A portion of a left valve, of which however only the inner side 

 is to be seen, and the whole of the cast belonging to it seems refer- 

 able to this species. 



Elongated oval, considerably arched witb a rounded ridge from 

 the beak to the posterior end. The umbo somewhat behind the an- 

 terior end, but little prominent. The cardinal margin slightly curved, 

 passing evenly over into the posterior margin ; ventral margin straight. 

 Surface with concentric lines of growth and — in the region above 

 the ridge — with numerous fine radial striae. A furrow on the cast 

 along the cardinal margin. 



Height of cast 34 mm, length 82 mm and thickness 24 mm. 



