NATURAL SCIENCES OF PHILADELPHIA. 191 



flattened, color much lighter, body whorl less inflated and very sharply cari- 

 nated. The northern form very rarely reaches the size figured. 



Helix skptkmvolva, Say, pi. xxxviii. Tiie middle figures come nearest to 

 Muhlfeldt's type of cereolun, figured in the Berlin Magazine. The internal lamina 

 mentioned on page 31 is found constantly in II. microdonta, Desh. of Florida. 

 It is not, however, confined to that alone, (Shuttl. Diag. Neucr Moll. No. 2,) as I 

 have detected it in a few instances in the large cereolus and other forms. In 

 Florida there are several varieties of this shell as well worthy of specific distinc- 

 tion as microdonta, Desh., volvoxis, Parr, and delitescens, Shuttl. Miihlfeldt's 

 name cereolus has priority, having been published in ISUi, and not 1818as quoted 

 by Pfeirfer, &c. The European conchologists, Pfeiffer, Reeve, &c., mention as 

 a synonym of this shell H. polygyrata, Binney, a name not even mentioned by 

 him. 



Helix sdppressa, Say, small var. PI. xxxvii. fig. 3. This appears to be 

 hicoslata, Pf. 



Helix plicata, Say, pi. xxxix. f. 2. Mr. Say's type is preserved In the col- 

 lection of the Academy. Having carefully ccmpared it with Mr. Lea's original 

 Troosdann, I am led to believe them identical. In this case Mr. Lea's name alone 

 will stand, as that of Mr Say is preoccupied. In Vol. ii. p. 195, II. plicata is 

 said to be identical with fatigiata. Say, Dorfeuilleana, Lea, and Troostiana, Lea. 

 T cannot agree with this opinion; H. fatigiata is certainly distinct from the 

 others. (PI. xxxix. f. 2.) The characters on which Mr. Lea's two species are 

 founded are certainly not very distinct; at the same time their constancy gives 

 them weight. Of twenty-five specimens found in Tennessee by the Rt. Rev. 

 Bishop Elliott, all were well marked H. Troostiana. 



Helix leporina, Gould, had been found only in Mississippi and Arkansas, 

 until Mr. Postel discovered it at St. Simon's Isle, Georgia, Dr. H. M. Neisler in 

 Butler County, of the same State, and Bishop Elliott at Savannah. Future re- 

 search will probably prove it an inhabitant of the whole South. 



Helix maxillata, Gould, has also been found by Dr. H. M. Neisler in Butler 

 County, Georgia. 



Helix buffoniana, Pf., pi. xliii. This seems rather the variety which Pfeiffer 

 described formerly as distinct under the name of Humboldtiana ; he now unites 

 the two. 



Helix ixflecta, Say, pL xlv. f. 3. It is a typographical error on p. 33 to call 

 this H. triodonta, Jahn. 



Helix polychroa, Binney, pi. xlvi. xlvii. It is hardly necessary to find 

 another name for this shell (ob. H. polychroam, Sowb.) asitseems to bevarians, 

 Mke. 



Helix selenina, Gould, pi. xlviii. This is certainly H. vortex, Pf., of the 

 West Indies. I do not agree with Dr. Gould, (p. 34,) in considering H. tenui- 

 striata, fJinney, as the same shell; a comparison of ihe description of the latter 

 will show them to be distinct. The geographical distribution is also very dif- 

 ferent. Dr. Binney's shell is from Tennessee, while vortex, is a West Indian 

 species, introduced only into the Southern extremity of Florida. The description 

 on the cover, Boston Journal Nat. Hist. iv. part 1, anno 1842, is as follows. 

 '■'■ Ilelijc tenuistriata. Testa depressa, carinata, umbilicata, albido cornea ; anfr. 7 

 oblique striatis ; opertura angusta, depressa, labro subrcflexo, basi convexo. Lat. 

 I poll. Hab. Tennessee." I have a shell in my cabinet to which this descrip- 

 tion applies prutty well ; I am not sure, however, that it is the same. Future 

 research will undoubtedly bring the species to light. • 



Helix auriculata, Say, pi. xl. I do not consider fig. 2, H. avara. Say, as a 

 var. of this, but a distinct species. There are some varieties of auriculata, which 

 may be confounded with it, but it is certainly a good species. Among other 



1857.] 



