122 



concave, the anterior portion nearly straight or parallel with the 

 axis. 



Surface ornamented with roundly angular axial ribs, which 

 terminate in bluntly angled tubercles at the shoulder ; shoulder 

 broadly and deeply undulate between the tubercles. The ribs 

 are seven in number on the body whorl, but increase to about 

 eleven on the posterior whorls. The sculpture on the posterior 

 spire-whorls consists of spiral lines crossed by transverse stride ; 

 that on the body-whorl is not accurately known but is apparently 

 limited to transverse lines of growth. 



Body-whorl with the ribs strongly developed into thick conical 

 tubercles at the shoulder, fading off to the front at about the 

 middle ; base gradually much attenuated. Aperture elongate- 

 obovate ; columella with three strong plications. 



Dimensions. — Total length, 150; greatest breadth, 62; length 

 of aperture, 95; greatest width, 28; diameter of pullus, 14;. 

 height, 13. 



Locality. — Calciferous sandstone of the River Murray cliffs 

 near Morgan. 



3. Voluta alticostata, spec. nov. Plate v., fig. 7. 



Shell resembling F. heptagonalis^ but is proportionately shorter 

 or broader. The ribs are sharply angled, eleven on the body- 

 whorl, increasing to fourteen on the posterior whorls. The sculp- 

 ture on the posterior whorls consists of crowded spiral lines 

 rendered wavy by the crossing of stride and growth lines ; the 

 same sculpturing is present on the posterior slope and shoulder of 

 the body-whorl, but the rest of its surface is smooth ; pullus and 

 columella plaits as in F. lieptagonalis. The pullus was hopelessly 

 shattered by an accident before the execution of the drawing, but 

 it revealed, in the unique specimen, a septum between it and the 

 spire. 



Dimensions. — Length, without pullus, 90 ; breadth, 49 ; length 

 and breadth of aperture, 60 and 21. 



Locality. — Lower beds at Muddy Creek (J. Dennant). 



4. Voluta Stephens!, Johnston. 



Reference. — Proc. Roy. Soc, Tasmania, for 1879, p. 35 (1880); 

 id.. Geology of Tasmania, t. 30, f. 1 (1888). 



From an unpublished drawing furnished me by Mr. Johnston^, 

 this large species belongs to the same natural group as F. hep- 

 tagonaHs and F. alticostata, being intermediate in proportions- 

 between the two ; it is further distinguished by having 1 4 ribs 

 on the body whorl, increasing to 18 posteriorly, and by the- 

 absence or indistinctness of spiral sculpture. 



Dimensions. — Length, 110; breadth, bb. 



Locality. — Table Cape {R. 21. Johnston). 



