44 AUSTRALIAN LAND SHELLS. 



111. Helix plectilis. Benson. Plate IX. Fig. 17, copied from 

 Reeve. 



Benson, Ann. and Mar/., Nat. Hist, 1853, p. 29. 



Reeve, Cone. Icon. sp. 1162. 



Helix paleata. Reeve, Cone. Icon. sp. 1309. 



Shell with a nearly covered umbilicus, globose, brownish-white, opaque, 

 strongly wrinkled above with very oblique elevated wrinkles, which 

 are angularly flexuose, and irregular ; beneath, towards the umbilicus, 

 marked with radiating, straight, and thinner wrinkles ; spire very 

 slightly elevated, apex obtuse; whorls 4, convex, sub-angular, last 

 deflected in front ; aperture diagonal, somewhat circular ; peristome 

 expanded throughout, slightly reflexed, margins closely approaching, 

 joined by a thin callus, columellar margin vaulted, widely reflected, 

 more or less covering the umbilicus. 



Diameter, greatest 0\57 ; least 0-47 ; height 0'3o of an inch. 



Habitat. Shark Bay and Swan River, Western Australia. Benson. 



This description is merely a version of that of Pfeiffer Mon. Hel. Vie, 

 Vol. IV., p. 250. Peeve remarks that the crumpled sculpture of 

 this species is quite distinct from anything previously known. 



112. Helix aridorum. Cox. Plate XI. Pig. 16, 16 a. M.O. 

 Cox, Pro. Zool. Soc., 1867. 



Shell deeply umbilicated, depressly -globose, thin, transparent, slightly 

 shining, radiately rugosely striated and under the lens, very 

 finely granulated, pale yellowish-horny; spire small, widely de- 

 pressed, apex obtuse, suture deeply impressed ; whorls 4^, convex, 

 last very large, rounded, swollen; base paler and smoother; aperture 

 Innately circular ; peristome thin, straight, reflected, margins eon- 

 verging, columellar margin moderately dilated at the base, and 

 covering of the umbilicus. 



Diameter, greatest 0*55; least 0-45 ; heir/hi 0'30 of an inch. 



Habitat. Clarence River, under logs in ironbark ranges, burrowing 

 in di'y weather. Mac Gill kray. Brisbane, Queensland. Masters. 



113. Helix exocarpi. Cox. Plate II. Fig. 2. M.C. 



Shell umbilieated, depressry-orbicular, nearly discoid, solid, ob- 

 scurely, irregularly and sometimes coarsely striated, everywhere 

 finely granulated, not shining, pale 3'ello wish-brown ; spire low, 

 widely-convexly-conical ; whorls .">, very gradually increasing, flatly 

 convex, last bluntly angular at the periphery, roundly-convex below, 

 descending in front ; base paler and smoother, and less finely granu- 

 lated than above ; aperture diagonal, hmately-rounded ; peristome 

 simple, regular, slightly expanded, margins approximating, colu- 

 mellar margin triangularly dilated above, and reflected, partially 

 covering the moderately sized umbilicus. 



Diameter, greatest 0*70 ; least - 6o ; height 0*35 of an inch. 



Habitat. Cherry Tree Hill. Mudgee and Ryalstone, N.S.W. Cox. 



