TUERITELLA. 235 



Turritella murrayana, Tcite (sp). 



1885. Torcula murrayana, Tate, Pap. Roy. Soc. Tas. 1884, p. 227. 



1893. Turritella murrayana, Tate and Dennant, Trans. Eoy. Soc. South 



Aust. vol. xvii. pt. 1, p. 222. 

 1893. Turritella murrayana, Tate, id. vol. xvii. pt. 2, p. 340, pi. viii. fig. 3. 

 1895. Turritella mwTayana, Pritchard, Proc. Roy. Soc. Vict. vol. viii. n.s. 



p. 115. 



This common species is liable to great variation, each distant 

 locality seeming to possess a dominant form. Professor Tate 

 describes it as follows: — "Shell pyramidally turreted, apical angle 

 about 15°. "Whorls twelve to fourteen, flatfish, 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 ornamented by about twenty-four spiral threads, with or 

 without smaller intermediary ones, crossed by close-set striae, the 

 latter on the anterior whorls thiuly squamose. Last whorl bluntly 

 truncated on the periphery ; base with spiral threads and trans- 

 verse strife on the upper part of the whorl. Aperture quadrately 

 oval, continuous ; outer lip with a deepish subtriangular median 

 sinus. The sectional outline of the whorls varies from flat or 

 slightly concave to somewhat quadrate, and correspondingly in 

 the depth of the suture ; the ante-medial keel is sometimes 

 obsolete, but the medial depression is always present." 



The last-mentioned feature and the numerous spiral lineations 

 are, perhaps, the chief difl'erentiating characters. 



Dimensions. — Length 55 mm.; breadth 17 ram.; length of 

 aperture 1 1 mm. 



Form, and Loc. — Eocene : Victoria and South Australia. 



G. 5535. A very narrow form in which the sutures are much 

 cut in ; from Muddy Creek. Purchased. 



G. 9126. Several examples illustrating stages of growth ; from 

 River Murray cliffs. Presetited hy William Evans, Esq. 



G. 9428. Three examples of the adult ; from Eiver Murray 

 cliffs. Purchased, 



