126 



Last whorl convexly quadrate, very mucli contracted at the 

 "tase ; with five intervariceal costae, thick and high at the 

 periphery, evanescent on the base ; base with two prominent 

 equidistant lircT, and intervening th^'eads. The lirae on the last 

 whorl are more or less granulated, especially towards the 

 marginal varix and base. 



Aperture sub-rotund; peristome continuous; the almost 

 semicircular sharp outer lip slightly interrupted by the pro- 

 jection of the four principal lir?e, obscurely denticulated ; 

 inner lip erect, with a sharply twisted columella plait at the 

 base. Canal incomplete, apparently sharply bent and re- 

 verted. 



Length, excluding canal, 24; breadth, 15"5 ; length of aper- 

 i;ure, 9. 



Locality. — Table Cape, Tasmania {R. HI. Johnston !) 



This species has some resemblance to the young of T. 8peng- 

 leri, but the whorls are more angulated, and the transverse 

 ornament is different, 



16. Triton oligostirus, spec. nov. Plate vi., fig. 7. 



Shell elongate-oval ; apex mamillate of two and a half small 

 Tounded whorls, the tip depressed. Whorls eight, convex, with 

 six principal encircling lira), feebly costated transversely (ten 

 between the varices); the intercostal spaces are latticed by the 

 intercrossing of spiral threads and stout, distant, elevated 

 stri^ ; the cost?e are feebly granule se, but more conspicuously 

 •on the two median and on the posterior of the principal lirse. 



Last whorl ventricose, with a rounded base ; spirally lirate, 

 and tessellated all over. The cost?e are slender, arched, and do 

 not extend on the base, feebly nodulo-granulate ; base with two 

 or three principal lirse, which are broken up into elongate, flat 

 granules. 



Outer lip toothed ; columella denticulated at the front. 



Length, 17"5 ; breadth, 9. 



Localities. — Adelaide bore ; and Turritella-clays, Aldinga 

 :Bay. 



This is another species of the Quoyi-group, from which it is 

 distinguished by the numerous spiral lirae, slender cost^e, and 

 tessellated ornament. 



17. Triton gemmulatus, spec. nov. Plate vi., fig. 8. 

 Shell turriculate, with a distorted spire of seven convex 

 whorls, ending in a large blunt apex of two and a half smooth 

 whorls, with a tip very small and rather depressed. Spire 

 whorls (excepting the apical ones) irregularly convex, being 

 ventricose in front of, and nearly flat behind, each varix ; orna- 

 mented with about 16 unequal linp, of which there are two 



