HELIX. 57 



MRS. GRAY, Fig. Moll. An. pi. 193, fig. 8. Ex. Boston Journal, 



(absq. desc.) 



DESK AYES, in Fer. i. 144, (excl. var.) 

 REEVE, Con. Icon. No. 678. 

 Helix denotata DESHAYES, 1. c. 3d ed. iii. 309. 



The extreme variation of this species has given rise to 

 considerable confusion. I propose to designate as a 

 prominent variety HELIX CAROLiiYENSis LEA, which is 

 considered as a variety only by Ferussac, DeKay, Bin- 

 ney, Chemnitz, Pfeiffer, Deshayes, and Reeve. The first 

 mentioned of these authors says, " This is H. palliata 

 Say, and my " denotata," (Bull, Zool. 1835, 2, p. 100). 

 Say is, I think, wrong in referring Lea's figure and de- 

 scription to Helix appressa var. a, (vid. Binney's ed. 36). 



Triodopsis scabra Rafinesque is quoted by Binney 

 (Boston Journal) and others as a synonym of this species. 

 I know of no description of such a species. The generic 

 definition of Triodopsis (vol. i. 49) will not apply to pal- 

 liata. 



I have found it in Vermont at Copperas Hill. 



The succeeding article will contain my views of Helix 

 obstricta, and Caracolla helicoides, which I have not 

 retained in the synonymy of palliata. 



HELIX OBSTRICTA SAY. 

 PLATE XV. 



Shell depressed, with elevated lines forming grooves between 

 them ; epidermis pale brownish, naked ; volutions five, depressed 

 above, beneath rounded, with an acute, projecting carina ; umbili- 

 cus covered with a white callus, indented ; mouth resembling that 

 of Jf. palliata. 



Inhabits Ohio. Breadth nearly one inch. 



This species is very closely allied to Helix palliata, but the epi- 

 dermis is not covered with small elevations as in that shell, and the 

 carina is very prominent and remarkable. 



8 



