358 A MANUAL OF AMERICAN LAND SHELLS. 



The laterals are the same as the centrals, but asymmetrical. The outer 

 laterals commencing at the eleventh, have a side cusp and cutting 

 point; the inner cutting point is bifid on the sixteenth tooth; after 

 this the cliange into the marginals is rapid. The marginals are low, 

 wide, and have one broad, long, oblique, bluntly bifid cutting point, 

 the inner division the smaller, and a very much shorter side cutting 

 point. This side cutting point is also sometimes bluntly bifid iu the 

 extreme marginal teeth. 



The dentition of the other species of this genus, extralimital to North 

 America, examined by me, agrees with that of this species. (See Pr. 

 Phila. Ac. Nat. Sc, 1874, 56.) 



llemitrochus varimis, Menke. 



Shell subimperforate, of medium size, solid, conic-globose, delicately 

 striate, but leaving the surface smooth, and shining; the ground-color is 

 variable, being white, dusky, greenish, or reddish, 

 and either plain or variously encircled by dark 

 bands ; the apex and the peristome, especially 

 the columellar portion, is always rose-red, and 

 generally', likewise, the throat; the spire is ele- 

 vated, composed of about 5^ convex whorls, the 

 outermost broadly rounded at the periphery ; the base is moderately 

 convex and perforated by a minute umbilicus, nearly covered by the 

 expanded and flattened peristome ; aperture small, approaching two- 

 thirds of a circle; peristome acute, thickened within, a little everted, 

 becoming more so towards its inner junction. Greater diameter 19, 

 lesser 17™™ ; axis, IS™-". 



Helix rarians, Mexke, teste Pfeiffer.— Pfeiffer, Mon. Hel. Viv., i, 238; in Chem- 

 nitz, ed. 2, ii, 221, pi. cix, figs. 1-5. — W. G. Binney, Terr. Moll., iv, 51, pi. 

 Ixxviii, tig. 22.— L. & Fr.-W. Sb., i, 184 (IBGll). 



Helix carnicolor, Pfeiffek, Symb.,i,37. — Deshayes, iu Fek., i, 205, pi. xxix. A, figs. 

 14-17.— Reeve, Cou. Icon., No. 283 (1852). 



Helix Pis«Ha, Pfeiffer, iu Chemnitz, ix, part 2, 139, t. cxxxii, figs. 1186,1187. — Fe- 

 RUSSAC, Hist., 1. c. ?— Not of Mijller. 



Helix submeris, Mighels, Bost. Proc, i, 187 (1844). — Pfeiffer, Mou. Hel. Viv., iii, 

 183. 



Helix rbodochdla, Binney (formerly), Terr. Moll., i. 



Hemitrochus /(awrts/ojHHs, SwAiNSON,Malac., 165, fig. 19? 



Hemitrochus varians, W. G. Binney, Terr. Moll., v, 175. 



Helix pohjchroa, Binney, Terr. Moll., ii, 123, pis. xlvi, xlvii. 



Polymita rarians, Tryon, Am. Journ. Conch., ii, .321 (1866). 



A species of the West Indian fauna, common on New Providence; 

 found also in th<' Florida Snbregion, on the keys, Key West, Upper 

 Metacumba Key, Key Biscay ne, Cain' Florida. 



