128 



Whorls three, excluding the pullus, slightly convex and a little 

 tumid medially ; spirally lined and transversely striate, con- 

 spicuously so on the posterior whorl. 



Last whorl elongated, a little tumid, hardly attenuated at the 

 base. Aperture elongate-oval, angled behind, with a wide open 

 canal a little bent to the right, and slightly reverted at the front. 

 Outer lip thick within, but bevelled to a sharp edge, a little 

 insinuated and slightly ascending at the suture, slightly ecurved 

 medially, patulous at the point. Inner lip nearly straight, with 

 four stout o})lique plaits. 



Dimensions. — Length, 61-5; breadth, 24; length of aperture, 

 43 ; width, 10 ; length of pullus, 6 ; width, 4-5. 



Locality. — Well-sinking, Murray Desert. 



This species has some affinity with V. Pacifica and other mem- 

 bers of the section Alcithoe ; but has not the outer lip proper to- 

 them ; from V. Pacifica, which it resembles most in shape, it 

 differs by its smooth flattish whorls. 



17. Voluta Masoni, spec. nov. Plate iii., fig. 9. 



Shell obconic, solid, smooth, polished ; whitish, with transverse 

 close-set, narrow, slightly undulose, chestnut lines. Last whorl 

 roundly angled at the periphery ; spire very short, acuminately 

 conical, ending in a small, smooth, broadly conical pullus of four- 

 whorls. Columella with four ^v ell-developed plaits, and sometimes 

 with an inconspicuous posterior one. 



Dimensions. — Length, 58 ; width, 29 ; leng-th of last wliorl^ 

 51 ; of aperture, 49. 



Locality. — Upper beds at Muddy Creek. 



This species belongs to the peculiarly Australian Section 

 Amo7'ia, amongst which it resembles T^. Turneri and V. undulafaj 

 having the shape rather of the latter, and the coloration of the 

 former ; it is, however, distinguished from both by the abrupt 

 peripheral inflation and the acuminate spire. 



By the kindness of Mr. S. Mason, the proprietor of the land 

 on which the chief fossiliferous deposits of Muddy Creek are 

 found, I am in possession of the interesting volute w^hich has 

 served for the foregoing description. It is with much pleasure I 

 associate Mr. Mason s name with his discovery, more particularly 

 also because of his hospitality and assistance rendered to all 

 visitors in search of fossils. 



18. Voluta crassilabrum, spec. nov. Plate iii., fig. 2a— c. 



Shell small, thick, oval ; pullus small, of two smooth convex 

 whorls. 



AVhorls three, excluding pullus, slightly convex excepting the 

 penultimate, which is somewhat tumid ; suture concealed by a 

 narrow sutural band. Surface ornamented with close-set, narrow,. 



