88 Proceedings of the Royal Society of Victoria. 



eocene beds of the River Mufray Cliffs. I happen to have 

 examples of this species from the type locality, as well as from 

 some Victorian localities ; and as these agree exactly in every 

 particular witli the original description and dimensions given by 

 Professor Tate, I feel every confidence in drawing attention to 

 some of the characteristics of the Table Cape form, which shows 

 a sufficient divergence from the typical Murray Cliffs shell to 

 warrant its recognition as an unrecorded variation to which this 

 species is liable. 



The whorls of the Table CajDe shell are not so distinctly angu- 

 lated, and instead of being only tuberculated at the anterior 

 suture of the spire-whorls and at the periphery of the body-whorl, 

 the tubercles are extended into distinct and slightly sigmoidal 

 costte, which are most highly elevated about the middle of each 

 whorl. The costai also appear to become more numerous than 

 the tubercles, for Professor Tate states " tubercles sma.ll, eight to 

 a whorl," whereas in the present form the costa? increase from 

 about eight in number on the posterior whorl to twelve or 

 thirteen on the body-whoi'l. 



The ornament of the Table Cape shell may be described as 

 follows : — Spiral ornament consisting of a few strong spiral 

 threads with several liner threads intercalated between them. 

 Each wliorl bearing from about eight to twelve prominent 

 thi'eads, the three or four on the anterior portion of each ^vhorl 

 usually being the most prominent, with five much finer threads 

 in tlie interspaces between ; of the latter thi'eads the middle one 

 is much stronger than the other two on either side of it. The 

 spiral ornament is crossed transversely by lines of growth, fine 

 sigmoid stria*, and distinct cost;e. 



The spiral ornament of the Murray Cliffs shell is identical with 

 the above, though one would not be able to judge so with cer- 

 tainty by comparison with tlie original description instead of 

 with actual specimens. 



The dimensions of the largest and best-preserved example from 

 Table Cape are as follows: — Length, 34 mm. ; breadth, 16 mm. ; 

 length of aperture, 11 nun. ; breadth of aperture, 7 mm.; length 

 of canal, 1 1 mm. 



