238 THl PBOCEEDIJNGS OF THE LINNEAN SOCIETY 



Professor Tate informs me that he has several specimens from 



the Murray River, where it doubles the size of the figured 



specimen. 



Adeorbis aster, pi. 21, fig. 6. 



A, t. minuta, discoidea, superne planata, suhtus conve^ra, late^ 

 perspective umbilicata, nitente ; anfr. o, undulose striatis, ad peri- 

 pheriam acute angulatis et lamellis latis deniiformihus armatis, 

 suhtus medio obtuse carinatisj Icevibus ; nucleo deprtsso, umbilico 

 hand ornato. 



This is a minute discoid shell, which is flattened or even de- 

 pressed above and very convex below. It has a very wide and 

 solarium-like umbilicus, which has no granules or ornamentation, 

 and the base is convex with an obtuse keel. The edge of the 

 whorls is very acute, having broad serrated spinous lamellae. It 

 does not appear that there is any fossil or existing species like it. 



Adeorbis acuticarinata. PI. 21, fig. 9. 



A. t. parva, discoidea, tenui, nitente, depressa ; anfr. 4, acute 

 multicarinatis, magnis et parvis alter nantibus, sed in ultimo iantum; 

 spira 2 proicipuis insignitis, sutura late concava et tenui striata ; 

 apertura orbiculata; umbilico lato, perspectivo, pro/undo, corrugato. 

 Diara. 4, alt. 1|. 



There is a fossil in the Norwich crag which is something like 

 this shell in its general form — A. tricaritiatus, S. Wood (Pale- 

 ontographical Society's Publication for 1818. Monograph of 

 Crag Mollusca, by Searles Wood, p. 138). Turbo sidciferus. 

 Lamarck, from the Paris basin, also resembles it. It is a small 

 discoid shell, very smooth and shining, with between seven and 

 eight sharp keels (four large, and three or four small) on the 

 last whorl, and two on the spire. Between the keels the shell is 

 deeply hollowed. The suture is in a broad groove, which is 

 striated. The aperture is not entire, but almost united ; the 

 umbilicus is broad, perspective, and corrugate. I am not ac- 

 quainted with any shell at all like it in the Australian seas. 



Trochita tdrbinata. pi. 21, fig. 1. 

 Testa turbinata, tenui, haud nitente, opaca, anfr. IJ, rofundatis 

 rapide crescentibus, lineis incrementi parum corrugatis et tenuiter 

 sir I alia ; apice exserto ; apertura suborbiculatay labro tenui, colu- 



