456 J- P- J. Havn. 



lines. — The right valve 8отелу11а1 less arched, but otherwise in the 

 main ywiih the same circumference and the same sculpture. 



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

 26 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: "Kløft Г' (1 spec), 

 "Kløft II" (at least 4 spec.) and in loose-lying stone at "4. Sænkning" 

 (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. 



1<S<S1. Aucella mosqiiensis Тсььвенс, Verst. Aucellen-Schichten Novaja-Semljas. p. 22: 



PI. 2, figs. 16—18. 

 1907. — SinzoiH Pavlow, Enchaînement etc., p. 17; PI. I, fig. 12. 



A number of moi-e 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 faintei-, concentric folds, and with more regular, distinct, some- 

 what undidating radial striae. 



Left valve: length 21mm, l)readth 14"5 mm and thickness 8'5 mm; 

 angle at the beak ca. 95°, 



The available specimens agree well with TuLLBERd's original 

 specimens, which 1 have seen in the Riksmuseum in Stockholm. 

 They likewise seem to be in perfect agreement with Pavlow's descrip- 

 tion and figures of specimens from Khanski. 



A single right valve resembles greatly in form A. solodiirensis 

 DK 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), 

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

 on Store Koldewey Island. 



Nova Zembla: in deposits with Cardioceras altcmans. 



Russia: in deposits with A. Bronni. 



12. Aucella cf. reticulata Lundgren, 

 PI. XXXII, fig. 4. 



1883. Aucella reticulata Lundgiien, Jura- und Trias-Fossilien von Spitzbergen, p. К) ; 



PI. I, figs. 0-7. 

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



