104 Proceedings of the Royal Society oj Victoria. 



Mupex Wallace!, sp. nov. PL VII., Fig. 3. 



Shell robust, ovately bicouic ; consisting of six and a half 

 whorls, including one and a half smooth, convex embryonic 

 whorls, the remainder being very perfectly and neatly sculptured. 



Varices three, not being very prominent till the third or 

 fourth whorl is reached, but strongly developed on the body 

 whorl, where the shell appears first to have had a thin foliaceous 

 lip extended into a delicate, erect, wing-like expansion, and 

 subsequently the base of this has become considerably thickened 

 by successive laminse, each of which is distinctly seen as it 

 terminates a little short of the one preceding it, thus completing 

 the anterior aspect of these well-marked varices. Posteriorly each 

 varix partakes of the ordinary sculpture of the whorls. The 

 varices are not regular, but rather strongly sigmoidal. Whorls 

 rather ventricose, with a deeply impressed suture, and bearing 

 about the middle of the intervariceal spaces a somewhat angular 

 nodosity. Ornament on the earlier spire whorls consisting of 

 about three or four strong spiral threads, transversely crossed by 

 fine lamellae of growth which are most pi'ominent and scaly 

 where they cross the spiral threads, on the succeeding whorls 

 there are a few more spiral threads visible, generally with one 

 or two finer intervening threadlets, till on the body whorl there 

 are about ten strong threads with fine intervening threadlets, 

 and still finer spiral strise, the whole regularly and closely 

 crossed transversely by growth lamellae. 



Aperture almost quadrate, the upper and outer angle being 

 formed by the well-marked posterior canal, peristome thickly 

 enamelled and distinctly effuse over the body-whorl. Outer lip 

 with a somewhat crinkled edge, and strongly dentate within, 

 bearing about ten or twelve oval denticles which cease at the 

 commencement of the canal ; effuse inner lip slightly raised, 

 continuous, and distinct to the canal. Columella slightly bent, 

 and at the posterior end of the canal bearing about three raised 

 denticles, similar to those on the outer lip. Snout broad, 

 umbilicus slight, canal about half closed, though wide and deep, 

 and making but a slight angle with the axis of the shell. 



Dimensions. — Length of shell, 30 mm. \ breadth of body- 

 whorl between the varices, 20 mm. ; breadth, including varices, 



