30 AtSTBALlAX LAKD SHELLS. 



appearance, no depression of last whorl ; peristome irregularly 

 rounded, lip simple, sharp, margins closely approximating, colu- 

 mellar margin moderately reflexed at the base ; umbilicus equalling 

 the diameter of the shell. 



Diameter, greatest 0'54 ; least - 42 ; height 0*33 of an inch. 



Habitat. Richmond River. Ramsay. 



Closely resembling young specimens of II. FranJIandiensis. 



77. Helxi Ramsayi. Cox. Plate XVHI. Fig. 11, 11a. 



Shell broadly and largely umbilicated, sub-discoid, depressed, covered 

 with a thin, smooth, bright olive epidermis, rugosely striated; spire 

 but little elevated ; whorls 4j? to 5, rapidly increasing, last whorl 

 round, broader and much dilated, very slightly deflected in front ; 

 umbilicus large and open, exposing the other whorls ; aperture hori- 

 zontal, large, ovately-rounded, bluish-white within, lip simple, 

 margins approximating, not reflected at the columella. 



Diameter, greatest l - 30 ; least 0-90 ; height 0-60 of an inch. 



Habitat. Richmond River. Ramsay. 



This fine species may be at once recognised from all others of its type 

 by the large inflation of the last whorl. 



XL SECTION HYGBOMIA. Rfr. Vers. p. 127. 



* H. Jervisensis. * H. Gilberti. 



78. Helix Jervisensis. Quoy et Gaimard. Plate I. Fig. 2, 

 2 a. M.C. 



Quoy et Gaimard, Toy aVAstr. II., t. 10, f. 2630. 



Reeve, Cone. Icon. sp. 758. 

 Shell perforate, depressly conoidly-globose, thin, fragile, obliquely 



striated with some irregularity, and granulated under the lens, 



transparent, of a pale-horny tint, generally red about the suture, 



and the umbilical region ; spire conical, and somewhat obtuse ; 



whorls 5, somewliat convex, the last inflated, and slightly keeled at 



the circumference ; aperture large, oblique, rotundately-lunate ; 



peristome with a thin rose coloured lip, and with margins apart ; 



columella dilated above, into a somewhat broad plate, half covering 



the perforation. 

 Diameter, greatest ,( J2 ; least - 73 ; height 0-75 of an inch. 

 Habitat. Jervis Bay. Quoy et Gaimard. Brisbane Water. MacGil- 



livray. Botany Bay Swamps. Cox. Lane Cove, N.S.W. Brazier. 

 This species is abundant about the swamps near Botany Ba} r , and 



agrees so thoroughly with the characters as given by Pfeiffer Mon. 



Hel. Fiv., Vol. III., p. 118 that I have thought it better to give a 



translation of his original description. 



79. Helix Gilberti. Tfr. Plate I. Fig. 8 ; and Plate XVIII. 

 Fig. 7 . M.C. 

 Pfr., Fro Zool. Soc., 1845, p. 127. 



Shell umbilicated, depressed, distinctly striated, very minutely granu- 

 lated, thin, of a pale-horny tint, ornamented by a red line at the 



