Mr. H. E. Strickland on the genus Cardinia. 105 



3. Cardinia crassiuscula. Sow. (sp.) 



Unio crass lusadus, Sow. Min. Con. pi. 185 ; Zieten, Verst. Wurt. 

 pi. 60. f. 1. 



Pachyodon crassiusculus, Stutchb. in Ann. Nat. Hist. vol. viii. pi. 9. 

 f.8. 



PiiUastra antiqua, Phill. Geol. Yorksh. pi. 13. f. 16. 



Var. 1. Small-sized, perhaps young, 



Cardinia elliptica, Ag. Et. Crit. Moll.pl. 12. f. 16, 17. 

 Var. 2. 



Cardinia similis, Ag. Et. Crit. Moll. pi. 12. f.23. 



Formation : lias. 



Localities : Pocklington and Robin Hood's Bay, Yorkshire ; Not- 

 tinghamshire, Gloucestershire, Somersetshire. 



Wurtemburg ; Stuttgard. Var. 1. Argovie ; var. 2. Soleure. 



After a careful comparison of specimens, I have little doubt of 

 the specific identity of the above references. 



4. Cardinia lanceolata, Stutchb. (pp.) 

 Pachyodon lanceolatus, Stutchb. in Ann. Nat. Hist. vol. viii. p. 484. 

 Formation : lower lias. 



Locality : Robin Hood's Bay, Yorkshire. 



The figui-e intended for this species by M. Agassiz was taken 

 from a specimen of C. attenuata which I sent him. 



5. Cardinia attenuata, Stutchb. (sp.) 

 Pachyodon attenuatus, Stutchb. in Ann. Nat. Hist. vol. viii. pi. 10. 



f. 13, 14. 



Cardinia lanceolata. Ag. Et. Crit. Moll. pi. 12". f. 1—3. 



Formation : top of lower lias, just below the marlstone. 



Localities : Hewlets near Cheltenham ; Bourton-on-the-Water, 

 Gloucestershire. 



M. Agassiz's figure above-quoted is taken fi'om a specimen 

 which I sent him, and I am therefore satisfied that it belongs to 

 the present species. 



6. Cardinia concinna. Sow. (sp.) 



Unio concinnns. Sow. Min. Con. pi. 223. f. 1, 2; Zieten, Verst. 

 Wurt. pi. 60. f. 2 to 5 ; Goldf. Petref. pi. 132. f. 2 ; Bronn, Lethsea 

 Geogn. p. 361. 



Pachyodon concinnus, Stutchb. in Ann. Nat. Hist. vol. viii. pi. 10. 

 f. 15, 16. 



Cardinia concinna, Ag. Et. Crit. Moll. pi. 12. f. 21, 22. 



Formations : marlstone and lias. 



Localities : Yorkshire ; Langar, Nottinghamshire ; Daventry, 

 Northamj^tonshire ; Saltford and Weston near Bath ; Wurtemberg, 

 Fachsenfeld ; Mogglingen ; Staffelegg in Argau. 



This is the largest species of the genus. I have a specimen 



