r 



EASTERN PROVINCE INTERIOR REGION SPECIES. 281 



Helix monodon, Rackett, Linn. Trans., xiii, 42, pi. v, fig. 2 (1822) ; ed Chenu, 269, pi. 

 xxvii, fig. 5.— Wood, lud. Snpplem., pi. vii, fig. 15 (1828); ed. Hanley, 226, 

 fig. 15.— BiNNEY, Bost. Jouru. Nat. Hist., iii, 360, pi. x, fig. 1 (1840) ; Terr. 

 Moll., li, 147, pi. xli, lower figs.*— Gould, Invertebrata, 174, fig. 113 (1841).— 

 Adams, Vermont Mollusca, 159 (1842).— W. G. Binney, Terr. Moll., iv, 60; 

 L. & Fr.-W. Sb., i, 120 (18G9).— Gould and Binney, Iuv. of Mass., ed.2, 419 

 (1870).— De Kay, N. Y. Moll., 35, part, excl. syn., pi. iii, fig. 19, not fig. 21, a 

 i (1843).— Mrs. Gray, Fig. Moll. An., pi. cxciii, fig. 11 (ex. Bost. Journ., no 

 desc.).— Billings, Canadian Nat., ii, 100, fig. 6 (1857).— Morse, Amer. Nat., 

 1, 151, figs. 12,13 (1867).— Pfeiffer, Mou. Hel. Viv., iv, 320. 



Helix convexa, Chemnitz, part (excl. syn. et tab. Ixvi, figs. 24, 27), pi. x, 17, 18. — 

 Pfeiffer, Mon. Hel. Viv., iii, 268 (excl. /? et y).— Deshayes, in Lam., viii, 112 ; 

 ed.3, iii, 308; Encycl. M6th., ii, 253 (1830) ; in Fi;R. l.,c., i, 144.— Reeve, Con. 

 Icon., 696 (1852), excl. syn.; No 717 (1854). 



Helicodonia Mrsuta, u, F:^russac, Tabl. Syst., 101, no desc. 



Stenoirema monodon, Morse, Journ. Portl. Soc, i, 10, fig. 13, pi. ii, fig. 2; pi. iv, fig. 

 14 (1864).— Tryon, Am. Journ. Concb., iii, 56 (1867).— W. G. Binney, Terr. 

 Moll., V, 298. 



Var. f rater num. 



Helix fraterna, Say, Long's Exp., ii,257, pi. xv, fig. 3; Binney's ed., 30, pi. Ixxir, 



fig. 3. — Mks. Gray, Fig. Moll. An., pi. cxciii, fig. 5, nodescr. — Binney, Bost. 



Journ. Nat. Hist., iii, 363, pi. x, fig. 2, not of Wood. 

 Helix monodon, De Kay, N. Y. Moll., 1. c, ex parte, pi. iii, fig. 21, a, 6(1843). — Wood, 



Ind. Suppl., pi. vii, fig. 15. 

 Helix convexa, Chemnitz, ed. 2, i, 86, ex parte. — Var. Reeve, Con. Icon., 1. c, — (3, 



Pfeiffer, Mon. Hel. Viv., i, 420. 

 Helix monodon, /?, Pfeiffer, 1. c, iv, 320. 



Var. L<eaii. 



Helix convexa, y, Pfeiffer, 1. c. — Var. Chemnitz, 1. c, pi. Ixvi, figs. 24, 25. 

 Helix monodon, y, Pfeiffer, iv, 320. — Part Binney, Terr. Moll., pi. xli, central fig- 

 ures. 

 Helix Leaii, Ward, MS., teste Binney. 

 Lister, Syn. Concb., pi. xciii, fig. 94. 



In the Post-Pliocene of the Mississippi Valley; now found in Can- 

 ada and all the Eastern Province to Texas. 



Animal yellowish-brown, darker on the head, neck, eye-peduncles, and 

 tentacles. Foot narrow, cylindrical, one and a half times as long as the 

 diameter of the shell, terminating in a point. Eye-peduncles one-fourth 

 of an inch long. Eyes black. Some individuals much darker than 

 others (see B. J. N. H., I, Plate X). 



The varieties of this shell present remarkable differences in size and 

 coloring and in the form of the umbilicus. The transverse diameter 

 varies from one-sixth to three sixths of an inch, and the form from sub- 

 globular in small specimens to a very flattened shape in the larger. 



*Tbe specimen figured is abnormal in not having a parietal tooth. 



