AUSTRALIAN LAND SHELLS. 6t 



callus, columellar margin dilated into a triangular plate concealing 



the umbilicus. 

 Diameter, greatest 1*22 ; least 1*12 ; height 0*78 of an inch. 

 Habitat. Moreton Bay, Queensland. Morelet. 



XXV. SECTION VALLONIA. PJr. Vers. p. 139. 



* H. cyclostomata. * H. Delessertiana. * H. Alexandra. 



152. Helix cyclostomata. Le Guillou. Plate X. Fig. 12, 

 natural size and magnified. M.C. 

 Le Guillou, Revue. Zool., 1842, p. 141. 



Helix Tuckeri. Pfr., Symbol, Vol. III., p. 77, 1846. 

 Helix strangulata. Homb. et Jacq., Voy. au Pole Sud., Zool., Vol. V., 

 p. 16, 1854. Plate VI. Pig. 14. 



Shell umbilicated, depressed, thin, slightly shining, pellucid, faintly 

 striated, and sparingly covered with very short hairs, brownish- 

 horny, occasionally with an obscure reddish line ; spire slightly 

 elevated ; whorls 4, flattish, last bulging and turned down in front, 

 constricted behind the aperture ; base convex, umbilicus moderate, 

 open ; aperture diagonal, somewhat circular ; peristome white within, 

 slightly thickened and reflected, the margins approaching. 



Diameter, greatest 0'40 ; least 0'32 ; height 015 of an inch. 



Habitat. Queensland, from Brisbane to Cape York, both near the 

 coast and inland ; also in the islands of Torres Strait. Cox. Dr. 

 Mueller has even sent me specimens from St. Kilda, near Melbourne. 



153. Helix Delessertiana. Le Guillou. Plate V. Figs. 8 a., 

 8 b. M.C. 



Le Guillou, Revue. Zool., 1842, p. 138. 



Helix Taranaki. Gray, M.S.S., inPfr.'s Symbolce, Vol.111., p. 19, 1846. 

 Helix Torresiana. Homb. et Jacq., Voy. au Pole Sud., Zool., Vol. V., 

 p. 10, 1854. PI. IV. Pig. 2427." 



Shell umbilicated, depressed, rather solid, rather shining, closely, 

 regularly, and rather strongly striately ribbed, either white and 



' rather glossy, or pale horny ; spire slightly prominent, suture rather 

 impressed ; whorls 5, slightly convex, the last convex and rather 

 tumid, scarcely descending in front ; base with ribs smoother than 

 above, umbilicus moderate, deep ; aperture lunately-ovate, slightly 

 broader than high ; peristome thin, expanded, white within, margins 

 approximating, columellar margin scarcely expanded above, and 

 slightly reflected. 



Diameter, greatest 0-70 ; least # 57 ; height 0-35 of an inch. 



Habitat. Islands of Torres Strait, from Nogo Island on the south to 

 "Warrior Island on the north. MacGillivray. 



A fine series of specimens has satisfied me regarding the correctness of 

 the synonyms given above. 



154. Helix Alexandrse. Cox. Plate VI. Fig. 1, natural size 

 and magnified. M.C. 

 Cox, Catalogue of Australian Land Shells, p. 35, 1864. 



Shell umbilicated, depressed, glassy, translucent, shining, faintly and 



