165 



2. Cassis textilis, Tate. Plate vii., fig. ii. 



Reference. — Trans. Roy. Soc. South Australia, vol. v., p. 45, 

 1882. 



Shell stout, ovate, ventricose, with a short conic spire ending in 

 .a small sub-globose pullus, the tip reverted and immersed. Whorls 

 live, excluding pullus, with varices at successive intervals of about 

 two-thirds of a v/horl, ornamented with numerous spiral threads 

 crossed by folds of growth, wrinkled at the suture. Last whorl 

 bearing on the superior angle a row of nine nodular tubercles, and 

 •on the medial portion two other rows equi-distantly placed, tlie 

 tubercles of which are smaller, much more so are those of the an- 

 terior row. Posterior area concavely sloping backward to the 

 suture. 



Outer lip thickened, margin plain. Columellar callus dentate ; 

 •columella very tortuous beneath the callus, canal recurved. 



Dimensions. — Lengi:h, 45 ; breadth of last whorl, 32 ; height, 

 29 ; length of aperture, 31. 



Localities. — Calciferous sandstones of the River Murray cliffs 

 near Morgan ; sand-rock, Cheltenham, Port Philip Ba,y, Casts 

 presumably of this species occur in the oyster banks at Adelaide 

 and Aldinga ; in the crystalline limestone of the Bunda Cliffs of 

 tlie Great Australian Bight ; in the raggy limestones at Mannuni 

 on the River Murray. 



This species differs in shape from the recent C. Jimhriata and 

 its fossil representative C. exiguco by being more ventricose and 

 by its longer spire. Its spiral ornamentation and triple rov/ of 

 'tubercles further distinguish it from C. fimhriatco. 



Genus Semicassis. 

 synopsis of species. 

 Aperture not exceeding two-thirds of total length; surface of 

 whorls spirally and longitudinally sculptured. 

 Whorls sub-angulate, with cEincellate sculpture. 



1. ^S'. transenna. 

 Whorls convex, longitudinally costate, and spirally ribbed. 



2. ;S'. suhgranosa. 

 Aperture at least two-thirds of total length; last whorl lirate 



or ribbed, not cancellate. 



Last whorl spirally ribbed on posterior area. 



3. S. MueUeri. 

 Last whorl spirally ribbed all over, three nodulose ribs. 



4. S. trinodosci. 

 Last whorl costated. 5. iS'. racliata. 



SPECIES UNFIGURED. 



S. sufflata, Teiiison Woods (Cassis), Proc. Roy. Soc, Tasmania, 

 for 1867, p. 21 (1879). Table Cape. 



