AUSTKALIAN LAND SHELLS. 63 



Habitat. Frankland Isles, N. E. Coast of Australia, on trees. Mac- 



Gillivray. 

 A handsome and very singular shell, of which Forbes remarks that it 



strikingly resembles in shape some marine Zizyphini. 



157. Helix Bidwilli. Pfr. Plate II. Tig. 3. M.C. 

 Pfr., Pro. Zool. Soc, 1853. 



Peeve, Cone. Icon. ep. 1034. 



Shell imperforate, pyramidally-conical, smooth, very faintly obliquely 

 striatulated, shining, white, marked with small burnt red spots, for 

 the most part arranged spirally, and largest about the mouth ; spire 

 regularly conical, suture very slightly impressed ; whorls 6, very 

 nearly fiat, last carinated, slightly swollen in front, and constricted 

 at the mouth ; base flat, with larger and darker blotches than above ; 

 aperture very oblique, somewhat oval ; peristome black, thinly 

 rounded, slightly reflected on the left, margins not approximating, 

 but joined by a very thin dark callus. 



Diameter, greatest OwO ; least - 63 ; height 0*65 of an inch. 



Habitat. Mary River and Ipswich, Queensland. Bid-well. Rich- 

 mond River, N. 8. W. MacGillivray. 



A handsome trochiform shell, which ascends smooth-stemmed trees in 

 the brushes to the height of 30 feet and upwards. It was originally 

 found by the late Mr. Bidwill, C.C.L. 



158. Helix delta. Pfr. Plate IY. Pig. 13, natural size and 

 magnified. M.C. 

 Pfr., Pro. Zool. Soc., 1856, p. 386. 



Helix conoidea. Cox, Catalogue of Australian Land Shells, p. 21, 1864. 

 Helix fenestrata. Cox, Pro. Zool. Soc, 1866, p. 374. 



Shell perforated, globosely- conical, keeled, thin, fleshy white, with 

 numerous faintly irregular elevated ribs, under the lens shewing 

 more minute spiral decussating lines, giving a fenestrated appear- 

 ance to the shell, especially towards the apex ; spire conical, obtuse ; 

 whorls 6, slightly convex, last somewhat sharply keeled ; aperture 

 diagonal, sub-angularly-lunate, pearly within ; peristome simple, 

 thin, acute, very slightly expanded on the columella above and re- 

 flected, somewhat covering the minute umbilicus. 



Diameter, greatest 040 ; least 0*35 ; height 0*25 of an inch. 



Habitat. Drayton Range, Queensland. Stutchbury. Cabbage Tree 

 Island, Port Stephens, N. S. W. King. Pine Mountain, Lismore, 

 Richmond River, N. S. W., on trunks of trees. MacGillivray. 



The fenestration of this very distinct, carinated, and widely conical 

 shell is sometimes indistinct. 



XXVIL SECTION TACHEA. Pfr. Vers. p. 142. 



* H. tescorum. * H. Dringi. 



159. Helix tescorum. Bens. Plate IX. Fig. 5, copied from Peeve. 

 Reeve, Con. Icon. sp. 1154. 



Benson, Ann. and Mag., Nat. Hist., 1853, p. 30. 

 Shell imperforate, conoidly-globose, solid, whitish (an colorata?), 



