OCR Text |
Show 1867.] DR. J. C. COX ON NEW AUSTRALIAN LAND-SHELLS. 725 subtilissime granulata, corneo-lutescente; spira convexa, obtusa, sutura mediocri, tenuiter rufo teeniolata; anfr. 5, lente accrescentibus, convexiusculis, ultimo rotundo-convexo; apertura lunari-rotundata; peristomate recto, tenui, marginibus subconniventibus, columellari supra dilatato et fornicatim reflexo. Diam. maj. 0*63, min. 0*57, alt. 0*30 une. Hab. Clarence River, about South Grafton (under bark and logs) (MacGillivray). A thin horny semitransparent shell, like a starved miniature H. grayi, Pfr., and approaching next to II. avidorum, mihi, a much more globose shell with an impressed suture. The reddish streak along the suture is not always present. 10. HELIX PACHYSTYLOIDES, mihi. II. testa umbilicata, globosa, solidula vel tenui, nitida, corneo-lutescente, striis incrementi levibus, rugatis, confertissime rugis irregularibus decussata ; spira brevi, obtusa, sutura crenu/ata ; anfr. 5, convexis, celeriter accrescentibus, ultimo permagno, infiato ; apertura fere diagonali, rotundatodunata ; peristomate extus flavo, intus pallide cameo (interdum albido), recto, tenuiter expanso, marginibus subconniventibus et callo tenui junctis, basali expansiore, columellari supra dilatato, intus subcalloso, externe umbilicum profundum semioccultante. Diam. maj. 1*20, min. 1, alt. 0*85 une. Hab. Cape York (Darnel). This varies considerably in solidity, being sometimes even a delicate thin and horny shell, then most nearly allied to the very small but exumbilicated variety of H. pachystyla. 11. HELIX MUCOSA, mihi. H. testa umbilicata, depresso-orbiculari, subdiscoidea, irregulariter et conferte rugoso-striata, solidiuscula, oleoso-micante; spira latissime conoidea, apice submersa ; anfr. 4\ lente accrescentibus, convexiusculis, ultimo subito antice deflexo, obsolete carinato, basi convexo, rugosostrigato ut supra, sed levius; umbilico perspective, fere ^ diametri eequante; apertura ro-tundo- lunari; peristomate simplici, recto, marginibus subconniventibus, columellari supra valde expanso et reflexo. Diam. maj. 0*30, min. 0*25, alt. 0*14 une. Hab. Clarence River (MacGillivray). Belonging to the section Discus, but not closely approaching any species known to me. I hope the name mucosa will stand, although there is already a mucida. 12. HELIX PEXA, mihi. H. testa umbilicata, depressa, fere discoidea, tenui, translucente, regulariter et conferte arcuato-costata, costis apparentibus ut binis coalescentibus, interstitiis non (sub lente) striatis, pallide lutescenti-cornea ; spira plana, sutura mediocri; anfr. 4, con- |