250 HELICID^. 



77. HELIX PERSPECTIVA, SAT. 



Plate XXX. Figure 1. 



H. testa parva, orbiculato-depressa, sub-discoidea, late 

 umbilicata, rufescente ; anfractibus convexiusculis, scabris, 

 striis transversis elevatis, eminentibus ; apertura sub-rotun- 

 data, depressa, interne unidenlata ; labro simplici, acuto. 



SYNONYMS AND REFERENCES. 



Helix perspectiva, Say, Journ. Acad. I. 18 ; Nich. Encyc. IV. 



KiRTLAND, Ohio Report, 173. 



Sager, Michigan Catalogue, 14. 



BiNNEY, Bost. Journ. Nat. Hist. III. 430, pi. 21. f. 4. 



De Kay, New York Report, 31 ; Fauna, 42, pi. 3, f . 38. 



Ferussac Tab. Sys-t. 44 ; Hist. Nat. dcs Moll pi. 79, (. 7. 



Deshayes, in Lamarck, VHI. 130. 



Chejinitz, 2d ed. tab. 65, f. 30-32. 



Pfeiffer, Monog Helic. Viv. I. 104. 

 Hdix parvida, Deshayes, Encyc. Meth. II. 217. 

 Euryomphala perspeiliva, Beck, Index, 11. 

 Patula perspectiva, Held, in Isis, 1S37, 91(5. 



DESCRIPTION. 



Animal. Head and tentacles bluish-black ; margin 

 and posterior part of foot white. Foot transparent, nar- 

 row, less in length than twice the diameter of the shell, 

 terminating acutely. 



Shell very much depressed, almost discoidal ; epi- 

 dermis reddish-brown, immaculate ; whorls six, with 

 numerous, elevated, strongly marked, transverse strire ; 

 suture deeply impressed ; umbilicus very much e.xpanded, 

 cup-shaped, exhibiting all the volutions ; aperture rounded, 



