165 



Phos gregsoni, Tate. 



1888. Phos gregsoni, Tate, Trans. Eoy. Soc. South Aust. vol. x. p, 1G8. 



1889. Flios gregsoni, Tate, id. vol. xi. p. 118, pi. iv. fig. 5. 



This species, allied to P. lireecostatus, differs from it in having 

 more prominent and erect longitudinal costse, in being augulate at 

 the periphery, and the whorls are more tumid. Its aperture is 

 relatively shorter and broader, and wider in front, whilst the 

 columellar twist is even more pronounced, and the spiral ornament 

 is comparatively regular. The protoconch is not preserved in 

 either of the specimens in the Museum collection. 



Dimensions. — Length 17 mm. ; breadth 8 mm. ; length of 

 aperture and canal 8 mm. 



Form, and Loo. — Miocene : Gippsland, Victoria. 



G. 9862. Two examples of the adult. Purchased. 



Subgenus LOXOTAPHRTIS,' nov. subgen. 



Shell narrow, elongate ; protoconch smooth, obtuse ; spire 

 turriculate, whorls angulate, ornamented by longitudinal costae 

 and spiral threads ; aperture narrow, acute at both ends, wider 

 towards the middle, channelled in front ; outer margin thin, 

 slightly reflected outwardly, bordered by a strong varix, faintly 

 lirate within, and continued round the posterior channel, or acute 

 groove ; inner margin continuous with the outer and consisting 

 of a shining plate affixed to the body-whorl, and covering the 

 •whole columellar border from which it rises, and is often detached ; 

 this leaf-like covering is slightly corrugated, but in no sense 

 plicate or tuberculate, it borders the twisted, oblique canal, and 

 gives rise to a small umbilicus. 



The entire peristome, and especially the disposition of the 

 enamelled plate constituting the inner margin, with its raised 

 edge, sugf^est affinities with Nassaria, Link {Hindsia, H. and 

 A. Adams), but the latter has not the same contour, and is 

 furnished with denticles on the columella. It differs from Phos, 

 tensu strido, which is of the same general configuration, in the 

 phenomena of the aperture already described ; but the chief point 



' Aofoj 'oblique' ; raippot 'canal.' 



