AtSTRALIAX LAXD SHELLS. 19 



large stair-case-like umbilicus ; whorls 6, convex, narrow ; aperture 

 sub-circular; sub-angulated at the base; lip simple, reflected near the 

 umbilicus. 



Width 0-30 ; height 0-18 of an inch. 



Habitat. New South "Wales. Gould. 



Probably allied to H. Omicron, which, however, has no pilosity. No 

 reference to the spire is given in the preceding description, taken 

 from the original, as copied by Pfeifl'er, Mon. Hel. Yiv., Vol. 1, 

 p. 116. 



46. Helix corticicola. Cox. Plate VII. Fig. 7, 7 a. natural size 

 and magnified. M.C. 

 Cox, Pro".7iool. Soc, 1866, p. 374. 



Shell rather widely umbilicated, depressly-circular, slightly shining, 

 covered with a yellowish-red epidermi?, above with pale radiating 

 streaks, irregularly and rather thickly ribbed, below rather smooth, 

 under the lens exhibiting obsolete spiral lines ; spire depressed ; 

 whorls 5, slantingly-convex, very gradually increasing, last obtusely 

 keeled, towards the mouth obsoletely so ; aperture lunately-sub- 

 circular ; peristome thin, simple, not dilated at the columella. 



Diameter, greatest 0'30 ; least 0*25 ; height 0*15 of an inch. 

 Habitat. Lismore, Richmond River, under bark in a pine scrub. 

 JIacGillivray. 



47. Helix mucosa. Cox. Plate XL Fig. 14, natural size and 

 magnified. M.C. 



Shell umbilicated, depressly-orbicular, almost discoid, closely and 

 irregularly striated in a wrinkled manner, rather solid, shining as if 

 from oil or mucus ; spire very widely conical, apex sunk ; whorls 4^, 

 very slowly increasing, slightly convex, last suddenly deflected in 

 front, obsoletely keeled ; base convex, rugosely striated as above, 

 but more lightly ; umbilicus perspective, nearly equalling -J- of the 

 diameter; aperture roundly-lunate; peristome simple, straight, mar- 

 gins somewhat approximating, columellar margin above, rather 

 strongly expanded and reflexed. 



Diameter, greatest - 30; least 0*25 ; height 0'14 of an inch. 



Habitat. Clarence River, under a log in a brush. MacGillivray. 

 A single specimen, in fine condition. 



48. Helix rapida. Pfr. Plate 111. Fig 9a., 9b. natural size and 

 magnified. M.C. 

 Pfr., Zeit-schrift far Malac, 1853, p. 54. 



Peeve, Cone. Icon. sp. 1038. 



Shell umbilicated, depressed, discoid, thin, horny, indistinctly rugosely 

 striated, most strongly about the suture, decussated under the lens 

 by minute, wrinkled, spiral lines, shining, profusely covered with 

 deep reddish-chestnut wavy patches, mostly radiating, streaks, 

 blotches, and spots ; spire flat ; whorls 3-L, rapidly increasing, 

 slightly convex, the last wide, slightly depressed above, rounded, 



