1864.] | MR. W. HARPER PEASE ON NEW LAND SHELLS. 669 
1. Hexrx osconica, Pse. 
H. ¢. depresso-conoidali, orbiculuri, tenui, subpellucida, nitidula, 
cornea, anguste umbilicata, sub lente tenuissime et dense oblique 
striata ; subtus regulariter conveca ; anfr. vi., planiusculis, leviter 
marginatis, ultimo ad peripheriam acute carinato ; apertura de- 
presse semilunari, superne angulata ; labro acuto, juxta umbilicum 
via reflexo. 
Diam. 7, alt. 43 mill. 
2. Hetix NoRMALIS, Pse. 
H. ¢. subconoidea, subtus convera, imperforata, tenui, fragili, niti- 
dula, rufa vel pallide cornea; anfr. v.-vi., rotundato-conveais, 
vie oblique dense et confertim striolatis, marginatis, ultimo cari- 
nato, regione umbilicali impressa; labro tenui, acuto, supra axim 
reflexo. 
Diam. 4, alt. 3 mill. 
3. Hrwix siIMILLima, Pse. 
H. ¢. orbiculari, tenui, fragili, subpellucida, glabra, nitida, levi- 
gata, supra planulata, viv elevata, subtus plano-convexa, imper- 
forata, in foveam centralem devexa, ad peripheriam late rotundata; 
anfr. iv., sutura distincta ; apertura lata, lunari, 
Diam. 9, alt. 4 mill. 
4, Heiix FABREFACTA™, Pse. 
H. ¢. lenticulari, solidiore, late et profunde umbilicata, acetabuli- 
formi, albicante, cretacea, sordida, inequaliter et irregulariter ra- 
diatim fusco-castaneo strigata vel maculata ; apice elevato ; spira 
concava ; anfr. vii., juxta margines depressis seu sulcatis, ultimo 
acute carinato, deinde planulato, ad umbilicum acute carinato ; 
apertura rhomboidea ; labro simplici, acuto. 
5. Hexix ricra, Pse. 
H. ¢. lenticulari, depressa, solidiuscula, late et profunde umbilicata, 
albicante, subcretacea, sordida, fusco-castaneo radiatim strigata 
vel tessellata ; anfr. viii. ; spira vie elevata, plano-convera, supra 
depressa; anfr. exterioribus plerumque prope margines sulcatis ; 
anfr. ultimo ad peripheriam acute carinato, deinde planulato, circa 
umbilicum acute carinato; apertura rhomboidea, lamella unica 
volvente instructa ; labro simplici, acuto. 
Diam. 7, alt. 24 mill. 
6. Hexrx scuupTi.is, Pse. 
i. t. conoidali, solidiuscula, flavicante, umbilicata ; spira obtusa, de- 
pressa, vix oblique confertim rugoso-costulata ; anfr. vii., medio 
excavatis, ultimo ad peripheriam acute carinato ; basi plano-con- 
vera, radiatim conferte tenuissime costulata ; umbilico cavernoso, 
[* This species and the next appear to me identical ; but Mr. Cuming’s better 
judgment confirms that of the author.—P. P. C.] 
