IGO 



peripliery, bearing nine curved somewhat liumpy costae, which 

 are crenulated by about six strong spiral threads ; base short, 

 rounded, contracted into a long, straightish, slender beak. 



Aperture oval ; outer lip with a slight callous thickening on 

 the margin, smooth within ; inner lip continuous with the outer 

 lip, much thickened, but not spreading, decurrent on the pillar; 

 with a stout oblique plait at the summit of the pillar and a few- 

 denticles behind. 



Length, 27"5 ; breadth, 19 ; aperture, length 12, width 7 ;; 

 length of canal, 13. 



Locality. — In a well sinking on the Eiver Murray Desert. 



2. Tudicula turbinata, »i-)ec. nov. Plate x., fig. 7. 



Shell globosely conical, with a short conical spire of flatly 

 depressed whorls ; apex mamillate, erect, of two smooth whorls. 

 Surface ornamented with angular, distant, spiral threads ; 

 interspaces angular, with a medial threadlet, coarsely striated 

 spirally, and finely striated transversely. 



Last whorl rather ventricose, especially towards the aper- 

 ture, rounded at the periphery, provided with short thick 

 costcT, ten in number, crenulated by three or four strong lirae ; 

 base short, rounded, contracted into a long, straight, slender 

 beak. 



Aperture oval ; outer lip slightly incurved behind the peri- 

 phery, where it is much thickened, margin crenulated and 

 scored for a short distance within ; inner lip continuous with 

 the outer lip, very much thickened, but not spreading, with a 

 stout oblique plait at the summit of the pillar and five or six 

 denticles behind. 



Length, 27 (canal incomplete) ; breadth, 23 ; aperture length, 

 20; width, 11; length of canal, 10 (incomplete). A young 

 specimen measures — length, 22"5 ; breadth, 8 ; length of aper- 

 ture, 8 ; of canal, 10. 



Localities. — Gastropod-bed of the Eiver Murray cliffs, near 

 Morgan ; lower beds at Muddy Creek (J. Dennantl). 



3. Tudicula angulata, spec. nov. Plate x., fig. 9. 



Shell globosely conical, with a short, flatly depressed spire, 

 apex erect mamillate of two smooth whorls. Last whorl angu- 

 lated at the periphery, ornamented with spiral lirae, irregularly 

 crenulated by oblique growth lines; lirae on posterior slope, 

 nearly equal and equidistant, narrow, rounded, and depressed, 

 the interspaces a little wider ; on the front and base the lirae are 

 stronger, wide apart, the interspaces occupied by three or four 

 threadlets. 



Aperture as in T. turhinata, except that there are no den- 

 ticles behind the columella-plait. 



