Mr. H. E. Strickland on the genus Cardiuia. 107 



an authority on which it must be very unsafe to found specific 

 distinctions. 



3. Cardinia Icevis, Ag. Et. Crit. Moll. pi. 12". f. 13—15. 



From Mulhausen. It is not the Lucina lavis of Goldfuss. 

 Perhaps a variety of C. Listen or crassiiiscula. 



4. Cardinia securiformis, Ag. Et. Crit. Moll. pi. 12". f. 16—18. 

 From Soleure ; described from a cast, and perhaps only a va- 

 riety of C. concinna. 



5. Sinemuria Dufrenii, De Christol, Bullet. Soc. Geol. de la France, 

 Jan. 11, 1841. 



From " fer oligiste " of Semur. It is impossible to say, from 

 the brief description given, whether this shell be a distinct species 

 or not. 



6. Unio depressus, Zieten, Verst. Wurt. pi. 61. f. 1. 



From Dejerloch near Stuttgard. Probably referable to variety 1 . 

 of C. Listen. 



III. Species apparently referable to other genera. 



1. Venulites trigonellaris, Schloth. Petref. p. 198; Cytherea trigo- 

 nellaris, Goldf. Petref. pi. 149. f. 5. 



From the lias of Alsace ; perhaps not a Cardinia. 



2. Unio abductus, Phillips, Geol. of Yorksh. pi. 11. f.42. 



From inferior oolite of Glaizedale. Possibly a Cardinia, but 

 M. Agassiz regards it as a Gresshja. 



3. Cardinia quadrata, Ag. Et. Crit. Moll. pi. 12". f. 10—12. 

 From lias of Lower Rhine. The above figure appears to re- 

 present an Astarte, and much resembles A. lurida, Sow. 



4. UnioListeri. Goldf. Petref. pi. 132. f. 1. 



This seems to be the Amphidesma donaciforme or rotundatum 

 of Phillips, and belongs to the genus Gresslya, Agassiz. 



5. Unio uniformis, Sow. Min. Con. pi. 33. f. 4. 



6. Unio acuta. Sow. Min. Con. pi. 33. f. 5, 6, 7. 



The last two species, said by Sowerby to be from the middle- 

 oolite, are referred to Cardinia by Agassiz, in his translation of 

 the ' Mineral Conchology.' 



7. Pachyodon hamatus. Brown in Ann. Nat. Hist. vol. xi. pi. 16. 

 f. 6. 



From Oxford clay of Gristhorpe Bay, and certainly not a Car- 

 dinia. 



8. Pachyodon vetustus. Brown in Ann. Nat. Hist. vol. xi. pi. 16. 

 f. 7. 



From shale at Gristhorpe Bay, and probably not a Cardinia. 



