Pisnuia.} GASTROPODA. 393 



Colour light yellowish-brown, sometimes marbled with reddish-brown ; 

 varices with a few brown bands ; aperture light brown inside ; outer 

 lip white within. Spire high, conic, a little higher than the aperture ; 

 outlines slightly convex. Protoconch small, of 1 smooth whorl, con- 

 vex. Whorls 6, regularly increasing, but the last high, lightly convex ; 

 base somewhat contracted. Suture uneven, impressed. Aperture high, 

 oval, distinctly narrowly channelled above, with a short, open, faintly 

 recurved canal below, its base slightly notched. Outer lip straightened 

 above, convex further down, with a thick broadly rounded varix on 

 the outside, much thickened and denticulate within. Columella 

 vertical, moderately excavated, smooth, and rounded. Inner Up not 

 broad, distinctly limited, spreading over the slightly convex parietal 

 wall, which bears a moderate broad tubercle below the suture. Opcr- 

 culum horny, with apical nucleus. 



Diameter, 12 mm. ; height, 31 mm. Diameter, 10 mm. ; height, 

 24 mm. (New Zealand specimen). 



Animal unknown. 



Type in the British Museum. 



Hab. Rangitoto Island (C. Spencer) ; Cape Maria van Diemen. 

 Also New Caledonia, Australia, and Tasmania. 



Remark. The spiral and axial ornamentation may be of equal 

 strength, or the latter predominant. The species is very rare with us. 



Genus 4. CANTHARUS, Bolten, 1798. 



Cantharus, Bolten, Mus. Bolten. (2), 1798, 132. Type : C. Tranque- 

 baricus. Gruel. Pollia, Gray, 1839 (in part). 



Animal having a narrowly elongated posteriorly obtuse foot, 

 the eyes at the bases of the tentacles, and a long siphon. Central 

 tooth of the radula narrow, with 5 cusps ; lateral teeth tricuspid, 

 the median cusp shorter than the others, the inner border of the inner 

 cusp sometimes crenated. 



Shell bucciniform, generally cancellated, having a thick epidermis ; 

 spire pointed ; aperture elliptical, channelled above ; outer lip thick- 

 ened and varicose, lirate within ; columella concave ; parietal wall 

 with a tooth above. Operculum horny, unguiculate, nucleus apical. 



Distribution. Antilles. Senegal, Japan, China, Pacific, Australasia, 

 Indian Ocean. 



Fossil in the Tertiarv. 



/ 



Subgen. 1. CANTHARUS, s. str. 



Shell spirally lirate and strongly axially cost-ate, the latter sculpture 

 predominating ; whorls mostly more or less distinctly shouldered ; 

 outer lip with a distinct varix, formed by the last axial rib ; columella. 

 transversely ridged, the ridges extending iisually the whole length of 

 it ; an umbilical chink is mostly present. 



