asjr J. P. J. Raw. 



lines. — The right valve somewhat less arched, but otherwise in the 

 main with the same circumference and the same sculpture. 



A left valve has the following dimensions: length 41 mm, breadth 

 2(5 mm and thickness ca. 9 mm; the angle at the beak 70°. — The 

 largest specimen has a length of 59 mm. 



Distribution. North-East Greenland: "Kloft I" (1 spec), 

 "Kloft II" (at least 4 spec.) and in loose-lying stone at "4. Sa-nkning" 

 (1 spec.) on Store Koldewey Island. 



Russia: in deposits with Cardioceras alternans. 



Germany: in Kimmeridgian deposits in Franconia. 



Mexico: ? 



11. Aucella Sinzovi A. P. Pavlow. 



PI. XXXII, fig. 3. 



1881. Aucella mosqnensis Tullbbrg, Verst. Aucellen-Schichten Novaja-Semljas. p. 22; 



PI. 2, figs. 16-18. 

 1907. — Sinzovi Pavlow, Enchainement etc., p. 17; PI. I, fig. 12. 



A number of more or less perfect casts of an Aucella must cer- 

 tainly be referred to this species. 



The shell very oblique, oblong-oval. The left valve fairly strongly 

 arched. The beak on both valves small, little prominent and curved 

 inwards. The surface with irregular interspaces covered with stronger 

 and fainter, concentric folds, and with more regular, distinct, some- 

 what undulating radial striae. 



Left valve: length 21 mm, breadth 14o mm and thickness 8-5 mm; 

 angle at the beak ca. 95°. 



The available specimens agree well with Tlllberg's original 

 specimens, which I have seen in the Riksmuseum in Stockholm. 

 They likewise seem to be in perfect agreement with Pavi.ow's descrip- 

 tion and figures of specimens from Khanski. 



A single right valve resembles greatly in form A. solodnrensis 

 de Lor., but is probably nothing else but a compressed (and thus 

 probably very broad) valve of the species above. 



Distribution. North-East Greenland: "Kloft I" (7 spec), 

 "Kloft II" (3 spec.) and in free-lying stones at "4. Sienkning" (5 spec.) 

 on Store Koldewey Island. 



Nova Zembla: in deposits with Cardioceras alternans. 



Russia: in deposits with A. Bronni. 



12. Aucella cf. reticulata LuNDGREN. 



PI. XXXII, fig. 4. 



1883. Aucella reticulata Lundgren, Jura- und Trias-Fossilien von Spitzbergen, p. Hi: 



PI. I, figs. (>-7. 

 1907. — — — ; Pavlow, Enchainement etc., p. 18. 



