66 CANCELLAEIA. 



Cancellaria wannonensis, Tate. 



1889. Cancellaria wannonensis, Tate, Trans. Roy. Soc. South Aust. vol. si. 

 p. 156, pi. viii. fig. 11. 



Shell solid, ventricose ; protoconch elevated, more vigorously 

 developed in some individuals than others, typically composed of 

 two and a half turns, but occasionally two and sometimes three 

 turns, faintly longitudinally ridged anteriorly ; whorls strongly 

 ribbed and spirally lirate ; aperture wide, outer border arcuate, 

 inner border callous, especially in the adult stage ; columella 

 imperforate, having three prominent plications, the posterior of 

 which is the largest, frequently with a smaller ridge between the 

 central and the posterior plications, and some rugosities on the flat 

 portion of the callus in the umbilical region. 



It has considerable affinities with the living C. semperiana, 

 Crosse, from New Caledonia, but the aperture of the latter is 

 much more dilated, the longitudinal costse are bolder, and the 

 shell as a whole not so solid. 



Dimensions. — Length 32 mm.; breadth 21mm.; length of 

 aperture 21 mm. 



Form, and Loc. — Miocene : Muddy Creek, Victoria. 



G. 4259. A senile example. Presented hy John Bennant, Esq. 



G. 5524. One specimen. Purchased. 



G. 9374. A series exhibiting stages of growth. Purchased. 



Cancellaria gradata, Tate. 



1889. Cancellaria gradata, Tate, Trans. Roy. Soc. South Aust. vol. xi. 



p. 155, pi. X. fig. 12. 

 1889. Bivetia gradata, Cossmann, Ann. Geol. Univ. t. v. p. 1091. 



This species is very different to any other Cancellaria from 

 Australasia in the British Museum. The shell is thin, cancellate, 

 sharply carinate, with a broad spiral platform at the suture ; the 

 spire in consequence is staged ; the protoconch is composed of one 

 and a half turns, the early portion of which is implanted obliquely 

 and is somewhat inflated, the remainder being decidedly convex 

 with deeply-cut suture ; aperture quadrately oval, outer border 

 crenulated, lirate within ; columella slightly callous, furnished 

 with three prominent plications. 



