44 HELICEA. 



Helix albolabris Chenu, Bibl. Conch. 3, 23, pi. iii. fig. 3 a. 



Pfeiffer, Symb. ad Hel. Hist. ii. p. 22, Excl. y and (5; Mon- 



Hel. Viv. i. 290. Excl. /? and Y; iii. 269. 

 PoTiEZ et MiCHAUD, Gal. p. 69. 

 Chemnitz, i. 81, pi. xv. f. 7, 8, (1847). Excl. var. C. and D. pi. 



X. fig. 4, 5. 

 Reeve, Con. Icon. No. 624. 

 Desha YES, in Fer. pi. xliii. fig. 1, 2, 3, 5; i. 137. 

 Billings, Canadian Nat. and Geol. 1857, ii. 98, fig. 2, 3. 

 Bland, N. Y. Lye. vi. 358; Notes 49. 



Pfeiffer's var. y and d of the Symbolse are respectively 

 major and exoleta. In the Monograph his /5 is perhaps the 

 former, and his y certainly is. In Chemnitz ed. nov. he 

 figures exoleta as var. D, and places major as C. 



Deshayes in Ferussac's History erroneously gives Flori- 

 da and Guadeloupe as the habitat. From his reference 

 to Ferussac's plates he seems to confound H. major with 

 H. albolabris. 



Petiver mentions this species in Phil. Trans. 1698, p. 

 395. 



As already mentioned, Bland unites major to this 

 species. 



I have this species from fourteen States. The series 

 presents very remarkable variation in the height of the 

 spire and in the form of the aperture. From Illinois I 

 have a few of a large variety, furnished with a strong, 

 tooth-like prominence on the reflected lip, near its col- 

 umella extremity. There is a variety, quite common 

 among the Pennsylvania Mountains, characterized by a 

 strong parietal denticle. It might readily be confounded 

 with exoleta^ but wants the more ventricose body whorl 

 of the latter. It occurs fossil in the Postpleiocene. From 

 Natchez Bluff, I have specimens with a remarkably flat- 

 tened spire. 



Helix rufa DeKay (N. Y. Moll. p. 44, pi. iii. fig. 

 30 a b.) appears to be the young of this species. It cer- 

 tainly cannot be placed, even doubtfully, in the synonymy 



