1845.] 555 



4. Dentulium coslatnm. Miii. Con., Williamsburg. 



This species agrees most perfectly with that of the Suffolk red and 

 coralline crag. It is called D. dentalis by Conrad. 



5. Ditrupa gadus. 



I cannot distinguish this from a shell of the English crag. 



6. Lucina divaricata. Petersburg, Virginia. 



Identical with the Touraine variety. 



7. Lucina contracta Say. 



Seems undistinguishable from the recent L. radula, which is also found 

 in the Suffolk crag. 



8. Perna maxUlata Lam. 



Mr. Conrad has considered this the same as the fossil which occurs in 

 the Mayence basin, which seems to agree well, though I have not perfect 

 specimens to compare. 



9. Astarte undulata Say. 



I have some specimens of A. hipartita from the Suffolk crag, which agree 

 perfectly with the American fossil, except that in the latter the sides of the 

 hinge teeth are much more distinctly grooved. A few only of the English 

 specimens exhibit a faint trace of this grooving. The species named by the 

 Americans A. vicina, A. arata, A, cuneiformis, A. ohruta, A. perplana, ap- 

 pear all to be varieties of the above species. 



Geographical Representatives ; or, American Miocene Species 

 closely allied to European Miocene Fossils. 



1. Oliva, n. sp. Wilmington. 



Resembles O. hispidula, and may be considered as representing O. Du- 

 fresnii Bast., of the Touraine faluns. 



2. Valuta mutabilis. Maryland and Petersburg, Virginia. 



Decidedly represents V. Lamberti of the English crag and French faluns. 



3. Buccinum trivitatum Say. Maryland and N. Carolina. 



Closely resembles a common Touraine species, which Dujardin has 

 called B. elegans, a name which cannot be retained. In the American 

 fossil the outer lip is not thickened, as in that from Touraine. 



4. Caricellaria lunata. Maryland. 



It comes very near to a crag species in Mr. Wood's collection, and is 

 allied to a Bordeaux species given me by M. Deshayes under the name of 

 C contorta. 



5. Trochus Audibarti Bast. Williamsburg, Maryland. 



The American shell is rather more acuminated than that of Bordeaux, 

 but is so near that some may consider it a variety. 



6. Solarium, new species. Williamsburg. 



Nearly allied to Solariella mactdata, Searles Wood, An. Nat. Hist. 9. 

 t. 5. f. 7. from the coralline crag, Suffolk. 



7. Calyptraa sinensis 9 Petersburg, Virginia. 



This fossil nearly resembles, if it be not the same as, C. sinensis, found 

 in the Suffolk crag. 



8. Panopcea rejlexa Say. Petersburg. 



Nearly allied to P. Faujasii, crag, Suffolk. 



9. Corbula elevata Con. Maryland. 



Approaches near to the recent C. nucleus, a Suffolk crag species. 



10. Tellina lusoria. Williamsburg. 



Nearly allied to T. donacina, Suffolk crag. 



1 1 . Astarte lirata Conrad. 



Nearly allied to A. gracilis, Coralline crag, Suffolk. 



12. Isocardia rusticu. Maryland. 



Allied to Isocardia cor, Suffolk crag. 



13. Pecten Jeffersonius. Petersburg. 



Allied to P. solarium of the faluns of Touraine. 



