84 MAEGINELLA. 



Marginella winteri, Tate. 



1878. Marginella tvinteri, Tate, Trans. Phil. Soc. Adelaide, 1877-8, p. 94. 

 1880. Mitra coarctata, Tenison-Woods, Proc. Linn. Soc. N.S.W. vol. iv. 



p. 8, pi. ii. fig. 10. 

 1889. 2[nr(jinella winteri, Dennant, Trans. Eoy. Soc. South Aust. vol. xi. 



p. 43. 



Shell elongate, subcylindrical, smooth ; protoconch obtuse, com- 

 posed of two smooth turns, the anterior being disproportionately 

 large ; spire elevated, three-whorled, body-whorl comprehensive, 

 ornamented by longitudinal curved growth-lines, suture con- 

 spicuous ; aperture elongate, tapering posteriorly, the sinus being 

 very small, broad anteriorly, and channelled ; outer margin 

 moderately thickened, but variable in individuals, closely crenu- 

 lated within ; columella callous, especially towards the anterior, 

 where five plications occur in the adult : these latter are close 

 together, and only four are well developed, the fifth one, 

 posteriorly, being very small, and altogether absent in young 

 specimens. 



This is by no means a typical Marginella, but it does not fall 

 conveniently into any of the recognized sections of the genus. 

 The writer does not, however, feel inclined to add to these latter, 

 already too numerous for systematic purposes. It differs from 

 Marginella {sensu stricto) in its cylindrical shape and exsert spire, 

 and by the possession in the adult of five columellar plaits. It 

 has certain affinities with Volvarina, Hinds, ^ which, however, 

 has only four plications on the columella, whilst its outer 

 margin is not crenulated, at least in the type species, M. avena, 

 Valenciennes. 



Specifically it closely resembles the living M. gracilis, 

 C. B. Adams {=z M. hibalteata. Reeve), from the "West Indies, 

 which is much smaller, more lanceolate, and is only quadriplicate. 



Dimensions. — Length 15'5mm. ; breadth 7 mm.; length of 

 aperture 10-5 ram. 



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



1 Proc. Zool. Soc. 1844, p. 75. 



