480 J- P- -^ Ravn. 



Oblong-oval, comparatively little oblique and rather stronglj' 

 arched. The umbo a little in front of the middle. The circumference 

 evenly rounded. The surface with fine, concentric lines of growth, 

 otherwise smooth. 



Height 18 mm, length 23 mm, thickness ca. 5 mm. 



The available specimens differ from Lindstrom's original examples 

 especiall}' in that they are higher and more strongly arched. It is 

 possible, however, that these original examples were somewhat de- 

 formed by pressure. 



Distribution. North-PZast Greenland: "Kløft Г' on Store 

 Koldewey Island (1 spec). In a loose-lying stone at "4. Sænkning" 

 on the same island (1 spec). 



52. Cyprina Panderi Коипллкн sp.? 

 1847 — 48. Astarte Panderi R(nu\AAKi\, Études prüjjr. Géol. Moscou. II. p. 4i;5; PI. G. 



fig. 28. 



I am inclined to refer some few, incomplete shells to this species, 

 especially from the nature of the surface. 



The shell rather strongly arched, slightly triangular-circular, 

 comparatively little oblique. The umbo a little in front of the middle. 

 The surface with characteristic, sharp, canaliculated, concentric furrows 

 at regular distances from one another; further with легу fine, con- 

 centric lines. 



RouiLLiER states, that this species forms a connecting link with 

 the genera Astarte, Liicina and Cyprina, and that it is very nearly 

 related to C. SyssoUae. To judge from the hinge, which he figures, 

 it seems most natural to refer it to the genus Cyprina, also because 

 it lacks the distinct, anterior pedal scar which is characteristic for 

 the genus Astarte. 



Distribution. N о r t h - E a s t G r e e n 1 a n d : "Kløft I" on Store 

 Koldewey Island (3 spec). 



Russia: in the 2. Etage of the Moscow .Jurassic 



53. Pleuromya peregrina d'Ohhkiny sp. 



1845. Panopaea peregrina d'Orbigny; Murchison, dk Verneuil et Keyserlinü, Geo- 

 logie de la Russie d'Europe. II. p. 468; PI. 40. 

 figs. 10—12. 



1847. Panopaea peregrina n'Onii.: Rouillier, Etudes progr. Géol. Moscou. II. p. 406. 



1881—85. Pleuromija peregrina d'Orb. ; Zittel, Handbuch der Paläontologie. II. 



fig. 179. 



The shell thin, rather strongly arched, rounded triangular ; the an- 

 terior margin truncated, the posterior margin more curved, the ventral 

 margin slightly curved. The umbo somewhat in front of the middle, 

 but little prominent, bent .strongly inward and somewhat forward. 



