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



3. Cardinia crassiuscula, Sow. (sp.) 



Unio crassiusculus, 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. 



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



Var. 1. Small-sized, perhaps young. 



Cardinia elUptica, 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. (sp.) 

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

 Formation : lower lias. 



Locality : Robin Hood's Bay, Yorkshire. 



The figure 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 from a specimen 

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

 the present species. 



6. Cardinia concinna, Sow. (sp.) 



Unio concinnus, 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, 

 Northamptonshire ; Saltford and Weston near Bath ; Wurtemberg, 

 Fachsenfeld ; Mogglingen ; Staffelegg in Argau. 



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



