3 ! AtTSTliALIAX LAND SHELLS. 



XV. SECTION TROCHOMORPHA. Pfr. Vers. p. 132. 



"'' H. Yorkensis. * H. cumulus. * II. Ophelia. 



87- Helix Yorkensis. Pfr. Plato IX. Fig. 8, copied from 

 Reeve. M.C. 



Pfr., Pro. Zoo!. Soc., 1854, p. 14-5. 

 Reeve, Conch. Icon. sp. 1372. 



(Shell with au almost covered perforation, turbinately-depressed, 

 thin, sculptured with hair-like striae, silky, somewhat reddish and 

 horny ; spire convexly-conoid, apex tine, suture smooth, simple ; 

 whorls 5, slightly convex, gradually increasing, last not descend- 

 ing, slightly angled at the circumference ; base somewhat shining, 

 impressed in the centre ; aperture diagonal, rotundately -lunar, of a 

 somewhat pearly-reddish, tint within ; peristome simple, straight, 

 margins slightly approached ; columella callus, and dilated above 

 the perforation. 



Diameter, greatest 0'39 ; least 033 ; height 0-19 of an inch. 



Habitat. Cape York, North Australia. MacGillivray. 



Specimens received from the late Mr. Cuming, labelled II. Yorkensis 

 so thoroughly disagree with the above description of Pfeiffer's that 

 I have thought it advisable not to figure them, but rather to copy 

 Reeve's figure, with which it agrees. 



88. Helix cumulus. Pfr. Plate IX. Pig. 11, copied from Reeve. 

 Pfr., Pro. Zool. Soc, 1854, p. 145. 



Reeve, Cone. Icon. sp. 1368. 



Shell perforate, turbinately semi-glubose, thin, very slightly striated, 

 shining, brown-yellow, horny ; spire convexly-conoid, apex fine, 

 slightly projecting ; suture smooth, scarcely margined ; Avhorls 

 5^-, slightly convex, slowly increasing, the last not descend- 

 ing, moderately angled at the circumference, a little convex at 

 the base ; aperture diagonal, lunate ; peristome simple, straight, 

 margins separated, columellar margin a little arched, slightly dilated 

 and reflected above. 



Diameter, greatest 039 ; least - 35 ; height 019 of an inch. 



Habitat. Manning River, New South "Wales. Pfeiffer. 



Not having seen this species, I have taken Pfeiffer's characters of it, 

 and given Reeve's figure. A variety of larger dimensions is noted 

 by Pfeiffer. 



89. Helix Ophelia. Pfr. Plate IX. Pig. 4, natural size and 

 magnified. M.C. 

 Pfr., Pro. Zool Soc, 1854, p. 146. 



Reeve, Conch. Icon. sp. 1345. 

 i hell perforate, turbinatety-depressed, thin, under the lens irregularly 

 marked with hair-like stria:*, scarcely shining, diaphanous, horny, 

 marked with narrow reddish streaks ; spire convexly-conoid, apex 

 fine, pointed ; whorls 5, flattish, rather prominent, gradually in- 

 creasing in size, the last not descending, moderately angled, rather 



