On Jurassic and Cretaceous fossils from North-East Greenland. 4711 



Loose-lying stones from "4. Ssenkning" contain a number of speci- 

 mens, up to 9mm high, of an Astarte with crenulated margin; these 

 may also be referred probably to the present species. 



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

 Koldewey Island (5 spec); "4. Saenkning" on the same Island (many 

 spec). 



Russia: black sand at Mniowniki. 



Germany: Brainier Jura e in Wurthemberg. 



England: Great Oolite. 



40. Astarte alta n. sp. 

 PI. XXXIV, fig. 2. 



The shell comparatively high and short, moderately arched, 

 triangular-ovoid. The umbo median, pointed and very projecting, 

 and bent somewhat forwards. The posterior margin slightly convex, 

 passing rather abruptly into the strongly curved ventral margin ; 

 the anterior margin slightly concave. From the umbo down to the 

 posterior part of the ventral margin a slightly concave depression. 

 Lunula distinctly marked off. The surface covered with numerous, 

 somewhat irregular, rather sharp, concentric ribs. The margin of 

 the shell crenulated. 



Height 13'5 mm, lenght 12 mm and thickness (of a single valve) 

 5 mm. 



This species is distinguished from A. striato-costata Mu. by its 

 high form and stronger ribs on the younger parts of the shell. 



Distribution. North- East Greenland. "Kl0ft*I" on Store 

 Koldewey Island (1 spec). 



41. "Astarte" retrotracta Roiulliek. 



1847 48. Astarte relrotracta Rouili-if.r, Etudes progr. Geol. Moscou; II etude, p. 414; 



PI. G. fig. 29. 



The valve small, oval, strongly arched. The umbo behind the 

 middle of the valve, inclined somewhat forward; in front of it a 

 distinct, oval lunula. 



The shell itself is only in part preserved in the single available 

 specimen ; it seems to have been thin ; its surface has only had 

 finer and coarser concentric striae. The hinge cannot be seen for 

 examination. 



Height 9 mm, length 11") mm and thickness (of the cast of a 

 left valve) ca. ,i-'i mm. 



Although the hinge is not known in the only specimen and the 

 margin of the shell seems to be smooth, the resemblance otherwise 



