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169 



1. Cassidaria gradata, spec. nov. Plate viii., fig. i. 



Shell thin, shining, pyramidally ovate, with a moderately 

 elongated scalar spire, ending in a small subacute pullus of one 

 and a half turns. Ordinary whorls five ; first whorl slightly con- 

 vex, lirate ; the succeeding whorls rapidly increasing to the 

 sharply gradated outline of the penultimate whorl. The angula- 

 tion is medial, and cut into sharp serratures, which terminate 

 oblique obscure ridges proceeding from the suture ; surface sculp- 

 tured with raised truncate threads, inequidistant and unequal, 

 separated by broad flat interspaces, from three to five above and 

 below the serrated keel ; the threads rendered obscurely granulose- 

 crenate by transverse growth lines. 



Some specimens show an angular spiral ridge at the anterior 

 suture, but is variable in the degree of its development. 



Last whorl with from four to five spiral keels on the median 

 portion ; the posterior one, at the angulation, with angular nodu- 

 lations (about 20), the others are angular or somewhat truncated, 

 and bear sharp tubercles, diminishing in size towards the front ; 

 interspaces concavely depressed with a few spiral threads and 

 transverse distant striae. 



Base of whorl with spiral ridges ; canal long, nearly closed, 

 abruptly bent and reverted. 



Aperture oblong ; outer lip thickened with two or three elon- 

 gate denticles at the front ; inner lip corrugated. 



Dimensio7is. — Length, 40 ; breadth, 30 ; length of aperture to 

 the canal, 25. 



Localities. — Lower beds at Muddy Creek ; calciferous-sand- 

 stones. River Murray Cliffs ; blue clays at Schnapper Point. 



2 Cassidaria 'Wilsoni, spec. nov. Plate vii., fig. 14, 

 Whorls sub-gradated, margined at the suture ; medially angu- 

 lar, cancellated. Last whorl with four obtuse ridges, bearing 

 small transversely elongated tubercles (about 30), becoming in- 

 creasingly inconspicuous anteriorly ; whole surface sculptured 

 with fine equi-distant spiral threads and regular growth lines, the 

 posterior slope being neatly and conspicuously fenestrated. 



Dimensions. — Length, 27 ; breadth, 17 ; length of aperture to 

 •canal, 19. 



Locality. — Spring Creek, near Geelong (J. B. Wilson I ). 



FAMILY STROMBID^. 



Genus Struthiolaria. 



1. Struthiolaria lirata, spec. nov. Plate x., fig. 11. 



Shell turbinately oval, sub-globose , whorls four and a half, 



those of the spire moderately convex ; ornamented by strong, 



equi-distant, depressed lirae, becoming more slender posteriorly ; 



