1880.] [mOLLUSCA OF SOXJTH AUSTRALIA. 41/ 



13. RissoiNA ELEGANTULA, 11. sp. (Plate XL. fig. 10.) 



Shell eloiigately pyramidal, moderately solid, white ; whorls 8, 

 slightly convex, longitudinally closely and regularly finely plicate, 

 the interstices (especially on the last whorl) crossed by fine lirse ; 

 sutures distinct ; aperture subovate ; outer lip thickened, and 

 slightly sinuous at the base of the columella. 



Diam. 1, alt. 3 lines. 



Hab. Aldinga Bay, from shell-sand {Tate). 



14. RissoiNA LiRATA, n. sp. (Plate XL. fig. 11.) 



Shell elongately pyramidal, rather thin, dull milky white ; whorls 

 7, a little convex, longitudinally sculptured with regular moderately 

 distant ribs that become obsolete towards the centre of the last whorl, 

 which is crossed between the periphery and the base with numerous 

 very fine, close-set hair-like stria3 ; outer lip thckened and variced. 



Length 2, breadth | of a line. 



Hab. Holdfast and Aldinga Bays, in shell-sand. 



15. CoLLONiA (?) ROSEOPUNCTATA, 11. sp. (Plate XL, fig. 8.) 



Shell minute, narrowly and deeply umbilicated, globosely turbinate, 

 solid, white, more or less dotted or flamed all over with bright rose- 

 colour ; whorls 4, convex, closely concentrically ridged throughout ; 

 aperture subcircular ; peritreme a little thickened and contracted. 



Diam. 1|, alt. 1^ line. 



Hab. Holdfast Bay, St. Vincent's Gulf; in shell-sand {Tate). 



Were it not for its umbilicus, this minute shell in ils general 

 aspect closely resembles a CoUonia, If the operculum, when dis- 

 covered, proves to be calcareous, then its relationship to that genus 

 will be more nearly established. 



16. Adeorbis vincentiana, n. sp. (Plate XL. fig. 9.) 



Shell depressedly conical, ovate, broadly umbilicated, moderately 

 thin, semipellucid, white ; whorls 3, rapidly increasing, the last 

 very large, convex, finely undulately concentrically striated, obtusely 

 keeled below the periphery, and with a basal keel surrounding the 

 umbilical region, which is crossed by somewhat irregular rude lines of 

 growth that become slightly crenate upon the keel ; spire small, 

 elevated ; apex papillary ; aperture semilunar ; outer lip arcuate, 

 simple ; inner lip nearly straight, sinuously angled posteriorly. 



Long. 3, lat. 21, alt. 1 1 hue. 



Hab. Aldinga Bay, St. Vincent's Gulf {Tate). 



About the same size as Adeorbis anffasi, A. Ad., from Port Jackson, 

 from which it differs both in form and sculpture. 



