336 Remarks on Certain Species of 



An anatomical description of the animals would in many 

 cases have been preferable to the slight external characters 

 given; but my facilities for examining their dentition were 

 entirely insufficient, and my time too much employed, to enter 

 into a series of minute dissections. 



1 cannot close these remarks without acknowledging the 

 kindness of H. Cuming, Esq., of London, who has rendered me 

 very great assistance by opening his fine collection for my 

 examination, and lending me the aid of his critical eye, disci- 

 plined by a long course of study and close observation, in this 

 aid in various other departments of scientific inquiry. 



XXXYII. — Remarks on Certain Species of North American 



HelicidoB. 



{Continued from page 302.) 



By Thomas Bland. 



Read September 13, 1858. 



Helix clausa Say. 



Synonymy. 



Helix clausa Say Jour. Acad. Phila. II. p. 154, 1821. 



" " Amer. Conch. No. 4, pi. 37, fig. 1, 1832. 



" Binney Bost. Jl. I. p. 482, pi. 15, 1837. 



" Be Kay N. Y. Moll. p. 31, ex parte, 1843. 



Pennsylvania Pfr. Mon. I. No. 759, ex parte, 1848. 



" Chem. ed. 2, Helix No. 442, ex parte. 



Mitchelliana " " " " 332, t. 56, fig. 6-8. 



clausa Binney Terr. Moll. II. p. 107, ex parte, pi. 4, 1851. 



