AUSTRALIAN LAND SHELLS. 105 



acute ; whorls 6, flattish, last nearly equalling the spire, ventricose, 

 with a cord-like keel round the umbilicus ; aperture slightly oblique, 

 angularly oval, orange or yellow within ; peristome somewhat 

 callous, right margin straight, basal rather angularly produced, 

 columellar somewhat spreading. 



Length 0*27 ; breadth 0*18 of an inch. 



Habitat. Australia. Pfeiffer. 



All relating to this shell, which I have not seen, has been taken from 

 Pfeiffer. 



Pam. II. HELICINACEA. Pfeiffer. 

 Pfr., Mon. Pneum. Viv., 1852, p. 318. Suppl. prim., 1858, p. 169. 

 Suppl. Sec 1865, p. 184. 



Operculum without any vestige of a spire, testaceous, 

 thick, or homy, thin (it is not possible to form a well 

 defined family from the material of the operculum), semi- 

 oval, or sub-triangular. For remaining characters consult 

 sub-order II. Ectophthalma. Pfr. p. 96. 



Sub-fam. II. HELICINEA. Pfeiffer. 

 Pfr., Hon. Pneum. Viv., Suppl. Sec, 1865, p. 211. 

 Shell heliciform, turbinated or depressed, often carinated ; 

 aperture semi-oval, or sub -triangular. Operculum not 

 spiral, smooth or granulated. 



For the description of the animal, consult sub-order 

 II. Ectophthalma. Pfr. p. 96. 



Genus 



HELICINA. Lamarck. 



Shell heliciform, turbinate, globose or depressed, covered 

 beneath with callus round the columella, which is rather 

 straight and flattish ; aperture triangular or semi-ovate, 

 entire ; peristome simple, straight or thickened, often 

 spreading broadly. Operculum thin, annular, semi-ovate, 

 membranaceous or shelly. 



Animal like Cyclophorus ; lingual teeth 3. 1. 3. Gray. 



* H. diversicolor. * H. Draytonensis. * H. reticulata. 



* H. CHadstonensis. ** H. fulgurata. * H. Lizardensis. 



* H. Yorkensis. * H. Gouldiana. 



250. Helicina diversicolor. Cox. Plate XVII. Fig. 9 natural 



size, 9 a., 9 b. much magnified. M.O. 

 Cox, Pro. Zool. Soc, 1866. 



Shell globosely-conoid, obsoletely sub-carinated, solid, above sub- 



