110 



is both shorter and deeper than in the specimen from the con- 

 cretion, and in other characters, as far as can be seen, the two 

 specimens are otherwise identical. 



The Coeloma-bed: 1 specimen. 



The Cyrena-bed: 1 specimen. 



Occurrence: Cr. unicarinatus Nyst is rather plentiful in 

 the Oligocène deposits of Belgium and Germany. 



9. Erycina sp. 



Plate III, fig. 12. 



In the Cyrena-bed is found a small shell showing its 

 interior, and the cast thereof. I have not been able to 

 examine the hinge, but on account of its form and the thin 

 translucent shell, I have determined the specimen as belonging 

 to the genus Erijcina. The palliai line is without a sinus. 

 The surface is most probably covered by fine concentric striae. 

 With regard to form the shell resembles most E. striatissima 

 Desh. from Calcaire grossier near Paris. 



Height 5 mm., length 7 mm. 



The Cyrena-bed: 1 specimen. 



to. Tellina sp. 



Plate III, fig. 10. 



There was also found a species of the genus Tellina in 

 the material which was brought home, it was however only 

 represented by a very imperfect specimen , and therefore not 

 suitable for exact determination. Both the united valves are 

 preserved , but only one allows of examination. The form 

 is comparatively high, and the surface is covered by fine con- 

 centric striae. 



Height 15 mm., length 18 mm. 



The Cyrena-bed: 1 specimen. 



