PATULA. 161 



Patula alternata, Say. 

 Vol. III. PL XXV. 



Shell broadly umbilicated, orbicularly depressed, thin, smoky horn-color 

 varied with red, interrupted, obliquely arranged patches and spots, roughened 

 by crowded, elevated rib-like striae, smoother below; whorls 5|, flattened, the 

 last sometimes obtusely carinated at its periphery ; umbilicus large, pervious; 

 aperture very oblique, lunately rounded, banded within ; peristome simple, 

 acute, its terminations joined by a very thin, transparent callus, that of the 

 columella subreflected. Greater diameter 21, lesser 19 mill. ; height, 10 mill. 



Helix alternata, Say, Nich. Encycl., PI. I. Fig. 2 (1817 - 19) ; Journ. Philad. 



Acad., II. 161 (1821); Binney'.s ed. 6, 21, PI. LXIX. Fig. 2. — Eaton, 



Zobl. Text-Book, 193 (1826). — Binney, Bost. Journ. Nat. Hist., III. 428, PI. 



XXV. (1840) ; Terr. Moll, II. 212, PI. XXV. — Gouxd, Invert, 177, Fig. 114 



(1341). — Leidy, T. M. U. S., 1. 253, PL VII. Figs. 2-5(1851), anat. — 



DeKay, N. Y. Moll., 29, PL II. Fig. 9 (1843). — Adams, Vermont Mollusca, 



162, Fig. (1842). — Ferussac, Tab. Syst., 44 ; Hist., PL LXXIX. Figs. 8-10. 



— Potiez and Michaud, Galerie, 104. —Chemnitz, 2d ed., I. 181, Tab. XXIV. 



Figs. 17, 18. — Pfeiffer, Mon. Hel. Viv., I. 102. — Deshayes in Fer. Hist., 



I. 89. —Reeve, Con. Icon., 670 (1852). — Billings, Canad. Nat., II. 99, Figs. 



4, 5 (1857). — W. G. Binney, Terr. Moll., IV. 98. — Bland, Ann. N. Y. 



Lye, VII. — Mouse, Amer. Nat., I. 187, Figs. 17, 18 (1867). — W. G. Binney, 



L. k Fr.-W. Sh., I. 73 (1869). —Gould and Binney, Invert, of Mass., ed. 2, 



412 (1S70). 

 Anguispira alternata, Morse, Journ. Portl. Soc, I. 11, Fig. 15 ; PI. IV. Fig. 16 



(1864). — Tkyon, Am. Journ. Conch., II. 261 (1866). 

 Helix scabra, Lamarck, Anim. sans Vert., VI. part 2, 88. — Deshayes, Encycl. 



Meth., II. 219 (1830); in LAMARCK, VIII. 66; ed. 3, III. 292. — Chenv, 



111., PI. VI. Fig. 11. 

 Helix infecta., Parreyss MS., Pfeiffer, Mai. Bl. 1857, 86 ; Mon. Hel. Viv., 



IV. 91, non Reeve. 

 Helix strongyhdes, Pfeiffer, Proc. Zool. Soc. 1854, 53 ; Mon. Hel. Viv., IV. 



91. — Peeve, Con. Icon., No. 1296 (1854).— FidcV'. G. Binney, Terr. Moll., 



IV. PI. LXXVII. Fig. 8. 

 Helix irwrdax, Shuttlewouth, Bern. Mitt. 1853, 195. — Goild in Terr. Moll., 



III. 19. — W. G. Binney, Terr. Moll., IV. 99. — Pfeiffer, Mon. Hel. Viv., 



III. 635. — Bland, Ann. N. Y. Lye, VII. (and var. Fergusoni). 

 Helix duhia, Sheppard, Tr. Lit. Hist. Soc. Quebec, I. 194. — McCtTLLOCH 



(where 0, teste Binney, Terr. Moll., I. 192. 



It is commonly found in the Post-pleiocene.of the Mississippi Valley, retain- 

 ing some of the color of the red flame-like patches. It now extends over the 

 whole of the Eastern Province as far north as Labrador. 



Animal : head and eye-peduncles light slate-color, back brown, remainder of 

 upper surface brownish-orange, eyes black, base of foot grayish-white, collar 

 saffron. Eye-peduncles one third of an inch long, blackish at the extremities. 



VOL. IV. 1 1 



