256 HELICID^E. 



77. HELIX PERSPECTIVA, SAY. 

 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 unidentata ; labro simplici, acuto. 



SYNONYMS AND REFERENCES. 



Helix perspective SAY, Jourii. A cad. I. IS; 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. Syst. 44 ; Hist. Nat. des Moll. pi. 79, f. 7. 



DESHAYES, in Lamarck, VIII. 130. 



CHEMNITZ, 2d ed. tab. 85, f. 30-32. 



PFEIFFER, Monog. Helic. Viv. I. 104. 

 Helix parvnla, DESHAYES, Encyc. Metli. II. 217. 

 Euryomphata perspectiva, BECK, Index, 11. 

 Patula perspectiva, HELD, in Isis, 1837, 916. 



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 striae ; 

 suture deeply impressed ; umbilicus very much expanded, 

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



