110 HELIX-CHAROPA. 



is obsolete above. Embryonic shell of H whorls plane and nearly 

 smooth, clearly marked off from the adult. Umbilicus very narrow, 

 abrupt at the margin, half covered by a tongue of callus. Aperture 

 crescentic, perpendicular, peristome thin, straight, projecting little 

 at the periphery. Callus especially prominent and heavy, curving 

 obliquely across the whorl. 



Diarn. maj. 2*, min. 2\, alt. 2 mill. (Hedley.*) 



Mt. Bischoff, Tasmania (Beddome) ; occurred under timber. 



Helix bischoffensis BEDDOME, Monograph of the Land Shells of 

 Tasmania, p. 39 ; Proc. Roy. Soc. Tasmania, 1879, p. 23. Charopa 

 bischoffensis HEDLEY, Proc. Linn. Soc. N. S. W. 1892, t. 2, f. 1-4. 



The type is in the collection of C. E. Beddome, Esq., R. N. My 

 description and figures are copied from advance proofs of an article 

 by my friend Mr. Hedley, now in press. 



P. RETEPOROIDES Tate. PI. 30, figs. 33, 34, 35. 



Shell rather widely umbilicatecl, depressed, orbicular, thin ; spire 

 a little elevated ; whorls five, convex, separated by a deeply 

 impressed or channelled suture ; last whorl rounded, not descending 

 in front, base convex ; aperture slightly oblique to the vertical axis, 

 subcircular ; peristome simple, its margins disunited ; columella 

 slightly reflected over the umbilicus, which is wide and perspective. 

 The ornamentation consists of regular, crowded, thin, elevated, equal 

 ridges, and transverse equidistant microscopic stria? in the inter- 

 costal furrows ; the ridges are more distant on the spire whorls than 

 on the last whorl ; the transverse striae are more conspicuous on the 

 base, and the distance between them about equals th^ width of the 

 interstitial grooves. Color of shell reddish-brown. (Tate.*) 



Alt. 4, greater diam. 7, lesser 6*25 mill. ; diameter of umbilicus 

 1-5 mill. 



Black Hill, near Adelaide, under rotten stumps of the grass-tree ; 

 under stones at the foot of the cliffs at the junction of the River Para 

 and Jacob's Creek; slopes of Kaiserstuhl, Barossa Range; in the 

 sti'tnr/y bark forests about Clare and Penwort/iam, S. Australia. 



H. reteporoides TATE, Trans, and Proc. and Rep. Roy. Soc. S. 

 Austr. ix, p. 62, t. 5, f. 14, 1887. 



This species belongs to a group of small shells, more or less 

 depressed and ornamented with raised lamella?, represented by many 

 species in Tasmania, with most of which I have compared it, and 

 by three described species in South Australia, but two or more spe- 



