133 



culated on the angulation. The sculpture consists only of fine 

 growth lines. 



Last whorl with ten curved, angular, or broadly angular ribs, 

 which are raised into sharp pointed tubercles on the keel ; costae 

 becoming obsolete towards the base ; base somewhat narrowly and 

 al^ruptly contracted behind the very broad, short canal. Outer 

 lip with a blunt margin, slightly emarginate behind, and ascend- 

 ing to the keel of the penultimate whorl. Columella nearly 

 straight medially, ecurved at the extremity with four stoutish, 

 €qui-distant plaits. 



Dimensions. — Length, 36; breadth, 17; length ot aperture, 

 26 ; diameter of puUus, 2*5. 



Locality. — Well-sinking, Murray Desert. 



29. Voluta antiscalaris, AJcCoj'. 



Reference.- — Prod. Pal. of Victoria, Dec. 1, tab. 6, fig. 5, 187-1. 



Shell ovately fusiform, with a short or moderately long spire ; 

 pullus small, swollen of one and a half turns. 



Spire whorls angularly convex, with a row of tubercles in front 

 of suture and a second on the angulation ; the latter terminate 

 angular ribs ; the two rows are separated by a rather wide con- 

 cave space. 



Last whorl with a variable number, about 15, of angular, 

 slightly sigmoid ribs, extending less than half w^ay to the base, 

 each ending in a sharp conical tubercle on the angulation ; there 

 is a second smaller row at the suture, separated by a concave 

 space. 



Outer lip thickened at the edge and crenulated towards the 

 front. Columella Avith about five plaits, the first and fifth small; 

 sometimes a sixth j^lait is interposed. 



The species shows some variation in the leng-th of the spire ; 

 the short-spired variety has a more ventricose body-whorl ; also 

 in the spiral sculpture, being in some individuals obsolete, except 

 at the base of the body-whorl. 



Dimensions of a moderate - sized specimen. — Length, 39 ; 

 breadth, 18-5 ; length of aperture, 29. 



Localities. — Pyans Pord ; Schnapper Point I (JlcCoy) ; low^er 

 beds at Muddy Creek ; calcif erous sandstones. River Murray clifis. 



This .species closely resembles V. scalaris, Sow., from the Middle 

 Eocene of Hampshire, but is especially distinguished by its ob- 

 tuse, not acute, pullus. 



30. Voluta anti-cingulata, Jl/cCoy. 



Reference.—Vvod. Pal. of Victoria; Dec. 1, tab. 6, figs. 2-4. 

 Synonym: — V. antiscalaris^ Johnston, Geol. Tasmania, t. 30,- 

 figs. 5-56. 



