On Jurassic and Cretaceous fossils from Nortli-East Greenland. 405 



The valve almost symmetrical and somewhat arched. Its surface 

 covered with numerous radial rihs, which seem to vary somewhat in 

 size and have possihly horne small, short spines or teeth. 



In other houlders h-om Vesterdalen are some fragments of valves, 

 of which only the innei- side can he seen; these have also had rihs, 

 alternately finer and coarser. How far these valves helong to the 

 same species as the ahove, cannot he determined. 



9. Aucella kirghisensis Sokoi.ow. 

 PI. XXXII, fig. 2. 



1903. Aucella kirgliisensis Sokolow, Aucellen aus Ost-Russland, p. 'M-l: Fl. 14, figs. 1-.'). 



1907. — — — ; Pavlow, Enchaînement etc., p. 13; PI. 2, figs. 



18-19. 



1908. — — — ; SoKOLOW, Aucellen vom Timan und von Spitz- 



bergen, p. 10; PI. 1, figs, 12-14. 



Some fairly perfect casts agree exceedingly well with the ahove- 

 cited descriptions and figures. 



The form of the shell oblong-oval, somewhat oblique. The left 

 valve strongly inflated, right valve somewhat less so. The beak 

 comparatively little prominent. Ear indistinct. Surface of the casts 

 covered with little prominent, concentric lines of growth and still 

 more indistinct radial ribs. 



The length ^ of the left valve figured is ca. 22 mm, its breadth 

 ca. IG mm and its thickness G mm; the angle at the beak is 

 ca. 95°. 



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

 dewey Island (5 spec). 



Russia: in deposits with Cardiocerds (ilteriums. 



lU. Aucella Bronni Lahlse.n. 

 PI. XXXII, fig. .■). 



1888. Aucella Bronni Roiill. ; Lahusp:n, Ueber die russischen Aucellen, p. 32; PI. I, 



figs. 1—7. 

 1901. — — — ; PoMPECKJ, Aucellen im Fränkischen .Iura, |i. 24; 



PI. 4, fig. 4. 

 19U7. — — Lahus. ; Pavlow, Enchaînement etc., p. 14; PI. 1, fig. 31. 



The left valve o])long-oval, very oblique, somewhat strongly 

 arched, flatter towards the posterior margin. The beak comparatively 

 small and little prominent, curved inwards. The anterior margin and 

 ventral margin forming a flat curve; the posterior margin slightly 

 concave, almost straight. Surface of the cast covered with numerous, 

 distinct, concentric folds and with numerous, fine, less distinct radial 



* The method used in measuring this and the following Aucella species is that 

 of Pavlow 1. c, p. 10 — 11). 



33* 



