236 TUEEITELLA. 



Turritella septifraga, Tate. 



1893. TitrrileUa septifraga, Tate, Trans. Eoy. Soc. South Aust. vol. xvii. 

 pt. 2, p. 336, pi. viii. fig. 5. 



A large species, distinguished by its rather concave whorls and 

 the absence of very conspicuous spiral ornament ; there is, however, 

 a slightly elevated bisected ridge bordering the suture on the 

 anterior of the sijire-whorls, behind which is a small but distinct 

 spiral lineation, and there are a few obsolete spiral threads ; the 

 lines of growth are deeply sinuous and numerous, but are not very 

 striking. 



Dimensions. — None of the specimens in the Museum collection 

 are perfect enough to enable the dimensions of the shell to be 

 taken; the author states that its length (incomplete) is 100 mm. 

 and width 17 mm. 



Form, and Loc. — Eocene : Spring Creek, Victoria. 



G. 9427. Several fragments. Purchased. 



Turritella platyspira, Tenison-Woods. 



1879. Turritella platyaplra, Tenison-Woods, Proc. Liriii. Soc. X.S.W. 



vol. iii. p. 234, pi. sx. fig. 13. 

 1893. Turritella platyspira, Tate and Dennant, Trans. Roy. Soc. South 



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

 1893. Turritella platyspira, Tate, id. vol. xvii. pt. 2, p. 341. 



Shell smoother and the ornament of the whorls less conspicuous 

 than in any other Australian species of Turritella here described. 

 Spire subulate and much attenuated ; protoconch (Plate VII. 

 Pigs, bor-h) composed of two smooth, porcellanous, somewhat 

 globose turns, the later portion being larger than the succeeding 

 whorl ; earlier whorls of the shell proper flat, and but slowly 

 increasing in size ; in the neanic and ephebic stages the whorls 

 become convex ; a sulcation which develops into a broad groove 

 occurs on the anterior portion of the whorls throughout ; surface 

 of whorls faintly spirally striated, and often bearing two or three 

 more prominent spiral lineations, the anterior one lying between 

 the sulcus alluded to and the suture ; lines of growth deeply 



