HELIX. 225 



represent this species, but in point of fact representing 

 the striated shell herein described as Helix lucubrata. 

 If, therefore, the two shells are specifically distinct, as I 

 consider them, no description or figure has been given 

 anterior to those published by me, and the name adopted 

 by me from Dr. Griffith will have the prior right ; but if, 

 on the contrary, they are only varieties, both must merge 

 under Helix lucubrata, Say, the first description having 

 been published under that name in 1829. 



59. HELIX LUCUBRATA, SAY. 

 PLATE XXXII. 



H. testa convexa, perforata, viridi-cornea ; anfractibus 

 quinque, regularher striatis ; apertura transversa, expansa ; 

 umbilico parvo ; labro simplici, acuto. 



SYNONYMS AND REFERENCES. 



Helix lucubrata, SAY, Disseminator, &c. 1829. 



Descriptions of New Terr. & Fluv. Shells, 13. 

 PFEIFFER, Mouog-. Helic. Viv. I. 98. 

 Helix Icevigata, FERUSSAC, Hist. pi. 82, f. 6, 1832. 



DESCRIPTION. 



ANIMAL. Head and superior tentacles dark blue ; 

 body and foot pearly white ; margin of foot furrowed, 

 furrows meeting over posterior termination. Caudal 

 extremity bluish above, with a gland. 



SHELL somewhat convex ; epidermis greenish horn- 

 color, shining ; whorls five, rapidly enlarging, with beau- 

 VOL. ii. 29 



