157 



third, and a few ridges apjoear on the columella-callus which is 

 thinly spread over the umbilical region. 



Dimensions. — Length, 29 ; breadth, 17 ; length of aperture, 20; 

 width, 9. 



Localities. — One of the commonest fossils in the upper beds at 

 Muddy Creek; Jemmy's Point, Gippsland Lakes ( W. H. Gregson!) 



Has some resemblance to a small group of recent species 

 gathering around C. ventricosa, Hinds, and C. Candida, Sowerby. 



11. Cancellaria semicostata. s_^ec. nov. Plate x., fig. 3. 

 Shell minute, stout, oval; whorls three and a half; spire- 

 whorls very convex ; penultimate whorl with ten thick rounded 

 costa?, evanescent at the posterior suture. Last whorl not so 

 ventricose as the penultimate, the first half turn with thick cost^ 

 on the median portion, becoming obsolete with the revolution of 

 the whorl. 



Aperture oval, rounded at each end ; outer lip thin, smooth 

 within; inner lip defined by a small chink behind the pillar; 

 columella, with a slight eff'use base and two thick hardly elevated 

 plaits above. 



Dimensions. — Length, 3 ; breadth, 2 ; length of aj)erture, 2. 



Locality. — Lower beds at Muddy Creek. 



Doubtlessly an immature shell, but difiers from the posterior- 

 whorls of any associated species. 



12. Cancellaria modestina, spej. nov. Plate ix., fig. 4. 

 Shell stout, oblong-ovate ; spire short, with an obtuse apex. 



Ordinary whorls three, slightly convex, a little depressed at the 

 posterior suture; spirally grooved, and transversely obsoletely 

 ridged, not plicate. There are about ten flatly rounded liraE", 

 separated by linear grooves on the penultimate whorl ; rudely 

 cancellated by the obsolete transverse threads. 



Aperture ovate; outer lip thin-edged, lirate within; columella 

 with three moderately stout plaits. 



Dimensions. — Length, 12; breadth, 7; length of aperture, 7-5. 



Locality. — Upper beds at Muddy Creek. 



Bears a close resemblance to C. purpuriformis, Valenciennes, 

 which has obsolete plications and stouter columella-j^laits. 



13. Cancellaria Etheridgei, JoJuiston. Plate ix., fig. 6. 



Reference. — Proc. Roy. Soc, Tasmania, for 1879. 



Shell turriculate; whorls five, convex, slightly angled jdos- 

 teriorly, distinctly ribbed on posterior whorls, crossed by five 

 angular lira?, which are obsoletely nodose at the intersections. 

 Last whorl lirate, except on the narrow posterior slope ; ribbed for 

 about a half turn ; the ribs gradually become less distinct with 

 the revolution of the whorl, and on the last half turn are obsolete.. 



