186/.] DR. J. C. cox ON NEW AUSTRALIAN LAND-SHKLLS. 725 



suhtilissime granulata, corneo-Iutescente ; sjnra convexa, ob- 

 tnsa, siifnni mediocri, tenuiter rufo tceniolata ; anfr. 5, lente 

 accrescentibus, concexhtscuUs, ultimo rotundo-convexo ; aper- 

 tura lunari-rotundata ; peristomate recto, tenui, marginibus 

 subconniventibus, coIumeUari supra dilatato et fornicatim re- 

 jlexo. 

 Diam. maj. 0-63, miii. 0-57, alt. O-^O unc. 



Hab. Clarence River, about South Grafton (under bark and lo^s ) 

 {MacGillivrmj). ° ^ 



A thin horny semitransparent shell, like a starved miniature H. 

 grmji, Pfr., and approaching next to //. 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. 



H. testa umbilicata, globosa, soUdida vel tenui, nitida, corneo- 

 Iutescente, striis incrementi levibus, rugatis, confertissime rugis 

 irregularibus decussata ; spira brevi, obtusa, sutura crenulatu ; 

 anfr. 5, convexis, celeriter accrescentibus, idtimo permagno, in- 

 flato; apertura fere diagonali, rotunda tolunat a ; peristomate 

 extusflavo, intus pallide cameo {interdum ulbido), recto, tenuiter 

 exjmnso, marginibus subconniventibus et callo tenui ju7ictis, 

 basali expatisiore, columellari supra dilatato, intus subcalloso, 

 exferne umbilicufn profundum semioccuUante. 



Diam. maj. 1-20, min. 1, alt. 0-85 unc. 



Hab. Cape York (Bamel). 



This varies considerably in solidity, being sometimes even a deli- 

 cate thin and horny shell, then most nearly allied to the very small 

 but exumbilicated variety of //. pachystyla. 



11. Helix mucosa, mihi. 



H. testa umbilicata, depresso-orbiculari, subdiscoidea, irregula- 

 riter et conferte rugoso-striata, solidiuscula, oleoso-micante ; 

 spira latissime conoidea, apice submersa ; anfr. A\ lente accres- 

 centibus, convexiusculis, ultimo subito antice defexo, obsolete 

 carinato, bast convexo, rugosostrigato ut supra, sed levins ■ 

 umbilico perspectivo, fere ^ diametri requante ; apertura ro- 

 tundo-lunari ; peristomate sitnplici, recto, marginibus subcon- 

 niventibus, columellari supra valde expanso et refiexo 



Diam. maj. 0-30, min. 0-25, alt. 0-14 unc. 



Hab. Clarence River {MacGillivray) . 



Belonging to the section Biscus, but not closely approachino- any 

 species known to me. I hope the name 'mucosa will stand, althou4 

 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- 



