LAND AND FRESH-WATER SHELLS OF N. A. [PART III. 



During an excursion to East Florida, in company with Messrs. Maclnre^ 

 Ord, and T. Peale, I obtained a single dead and imperfect specimen of this 

 interesting shell. It occurred in a small creek, tributary to St. John's 

 River, and on the plantation of Mr. Fatio. Captain Le Conte, of the Topo- 

 graphical Engineers, has since presented me with a perfect specimen, with 

 the information that he observed them in very great numbers on the shores 

 of Lake George, a dilatation of St. John's River ; that in some places the 

 dead shells were piled up confusedly to a considerable height, and that the 

 Xumeuius loiujirostra feeds upon the living animal. The spire is still less 

 elevated than that of the glohosa of Swainson. 



Ampullarki depressa. — As the name dijiressa of the Appendix to Long's 

 Exped. p. 264, is preoccupied by Lamarck for a fossil species, it may be 

 changed to paludosa . (Sai/.) 



Ampullarta depressa, Say, Long's Ex. 264, pi. xiv, f. 2 ; Binxey's ed. p. 



130, pi. Ixxiii, f. 2. — Haldeman, ^Iou. p. 5, pi. i, ii. — De Kay, N. Y. 



Moll. 124. — Hanley, Conch. Misc. pi. iii, f. 9. — Philippi, in Chemn. 



ed. 2, p. 52, pi. xvi, f. 4. 



Amptdlaria paludosu, Say, New Harm. Diss. IL 260 ; Desc. 22 ; Binney's 



ed. p. 147. 

 Ampullaria hopetonmsis, Lea, Tr. Am. Phil. S. V, 115, pi. xix, f. 84 ; 

 Obs. I, 227.— DeKay, N. Y. Moll. 124.— Reeve, Con. Icon. fig. 60.— 

 Philippi, in Chemn. ed. 2, p. 36, pi. ix, f. 7. 



Figure 5 represents the lingual dentition of a specimen of 



Fomus depressa kindly furnished 

 me by Prof Agassiz. The teeth 

 are light brown in color, and make 

 thirty-four rows in all; the first 

 and second laterals are notched 

 and the third is simple. The cen- 

 tral tooth has seven denticles, the 

 central one quite large, the next 

 two short and blunt, and the last 

 rather long and l)lunt. 



Mr. Say proposed the name 

 jMludosa because his first name, 

 depressa, was preoccupied by 

 Lamarck, An. s. Yert. 1822. 

 Since, however, that Ampul- 

 laria de2)ressa, Lam. has been 

 removed to the genus Natica, I 

 adopt Mr. Say's first name. 

 Figs. 1 and 3, represent the 

 Pvmus depressa. animal aud operculum of this 



Lingual dentition of Pomus depressa. 



