340 



smooth and sharply earinated in the middle, anterior whorls 

 flatly convex to the sharp or blunt angulation at (and somewhat 

 imbricating over) the anterior suture, sometimes the anterior 

 angulation is obsolete. Surface ornamented with spiral threads 

 (about fifteen or more) ; of these three to five are sharply 

 elevated into slender keels, the medial one of which is usually 

 the most prominent, the interspaces being then finely lirate ; 

 rarely are the threads approximately of equal strength. The 

 transverse ornament consists of medially-arched growth-lines, 

 close or rather distant, in the latter case producing the appear- 

 ance of punctures, sometimes the lines of growth are raised into 

 lamellae. Periphery of body-whorl acutely angulated, base con- 

 centrically ribbed and radially striated. Aperture subquad- 

 rangular, slightly oblique, columella nearly straight, thinly re- 

 flected and spreading behind ; outer lip not seen perfect. 



Dimensions. — Length, 38 ; breadth, 6-25 



Localities. — Eocene : River Murray Clifi's (very abundant !); 

 Sc. Mornington ! ; Muddy Creek ! ; Cheltenham ! ; Corio Bay ! ; 

 Camperdown ! ; Gellibrand River ! ; Spring Creek ! ; Table Cape. 

 Miocene : Gippsland Lakes ! ; Aldinga Cliff's (imperfectly deter- 

 minate !). 



This species varies in the form of the whorls and the develop- 

 ment of the lirte ; a variety occurring at Gellibrand River and 

 Muddy Creek has slightly, though regularly, convex whorls, 

 which are finely lirate (pi. ix., fig. 4); a similar form occurs at 

 Table Cape (pi. iv., fig. 12), but is much stouter, slightly angu- 

 lated towards the suture, and strongly lirate. 



It is separable with difficulty from T. acuta, Ten. -Woods, Proc. 

 Roy. Soc. Tasmania, p. 14.3, 1876, a recent species in S. Australia 

 and Tasmania : they have similar apices, and exhibit the same 

 variation in the extent of imbrication of the whorls ; but 

 T. acricula is relatively narrower, and has more lir^e, whilst in 

 T. acALta the lira? never assume the character of keels. 



10. Turritella Murrayana, Tate. Pi. viii., fig. .3. 



Torcula Murrayana, Tate, Proc. Roy. Soc. Tasm., for 1884, 

 p. 227 (1885). 



Shell pyramidally turreted, apical angle about 15'. Whorls 

 twelve to fourteen, flattish, medially depressed, and acutely 

 elevated at about the anterior-fourth ; suture thread-like or 

 somewhat grooved ; apical whorls two, very small, globulose ; 

 first spire-whorls rapidly enlarging 1-3 carinate. Surface orna- 

 mented by about 24 spiral threads, with or without smaller inter- 

 mediary ones, crossed by close-set stride, the latter on the anterior 

 whorls thinly squamose. Last whorl bluntly truncated on the 

 periphery; base with spiral threads and transverse stride as on 

 the upper part of the whorl. 



