PATULA. 161 



Patula alteruata, SAY. 

 Vol. III. PI. XXV. 



Shell broadly umbilicated, orbicularly depressed, thin, smoky born-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 alternala, SAY, Nich. Encycl., PI. I. Fig. 2(1817-19); Journ. Pliilad. 

 Acad., II. 161 (1821); BINNEY'S ed. 6, 21, PI. LXIX. Fig. 2. EATON, 

 Zool. Text-Book, 193 (1826). BINNEY, Bost. Journ. Nat. Hist., III. 428, PI. 

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

 (1841). LKIDY, T. M. U. S., I. 253, PI. 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., PI. LXXIX. Figs. 8-10. 

 -PoriEz and MICH AUD, Galerie, 104. CHEMNITZ, 2ded., 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. BINNKY, Terr. Moll., IV. 98. BLAND, Ann. N. Y. 

 Lye., VII. MORSE, Amer. Nat., I. 187, Figs. 17, 18 (1867). W. G. BINNEY, 

 L. & Fr.-W. Sh., I. 73 (1869). GOULD and BINNEY, Invert, of Mass., ed. 2, 

 412 (1870). 



Anguispim alternala, MORSE, Journ. Portl. Soc., I. 11, Fig. 15 ; PI. IV. Fig. 16 

 (1864). TRYON, Am. Journ. Conch., II. 261 (1866). 



Helix scabra, LAMAKCK, Anim. sans Vert., VI. part 2, 88. DESHAYES, Encycl. 

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

 111., PI. VI. Fig. 11. 



Helix infecta, PARREYSS MS., PFEIFFER, Mai. Bl. 1857, 86 ; Mon. Hel. Viv., 

 IV. 91, non REEVE. 



Helix strongylodes, PFEIFFER, Proc. Zobl. Soc. 1854, 53 ; Mon. Hel. Viv., IV. 

 91. REEVE, Con. Icon., No. 1296 (1854). VideW. G. BINNEY, Terr. Moll., 

 IV. PI. LXXVII. Fig. 8. 



Helix mordax, SHUTTLEWOKTH, Bern. Mitt. 1853, 195. GOULD 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 dubia, SHEPPARD, Tr. Lit. Hist. Soc. Quebec, I. 194. McCuLLOCH 

 (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. 11 



