8 



size of the plication, its situation, and the excavated columella 

 behind it, recall the genus Solidula to some extent, though it 

 materially differs in only possessing one plication, which is not 

 bifurcate. Mr. Tenison- Woods does not give a figure of this 

 species, but from his description the identification appears certain ; 

 it is now figured. 



Dimensions (of the figured specimen). — Length 9|^ mm. ; breadth 

 4^^ mm. ; length of aperture 6 mm. 



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



G; 4296. One specimen. Presented hy John Dennant, Esq. 



Genus SOLIDULA, Fischer de Waldheim. 

 [Museum Demidoff (Moscow), t. iii. 1807, p. 226.] 



Dactylus, Schumacher, Essai Nouv. Syst. Habit. Testaces, 1817, 



pp. 70, 234. 

 Buccimdus [Plancus), H. and A. Adams, Gen. Rec. Moll. vol. ii. 



(1854) p. 5. 



The columella of this genus carries two plications, the anterior 

 prominent and bifid, the posterior comparatively inconspicuous 

 when the shell is entire ; between them the columella is spirally 

 excavated. These, amongst other characters, distinguish Solidula 

 from Adeeon. 



Type. — Voluta solidula, Linn. 



Solidula alba, Hutton (sp.). 



1873. Buccimdus albus, Hutton, Cat. Marine Moll. N.Z. p. 51. 

 1873. Buccinulus albus, Hutton, Cat. Tert. Moll. N.Z. p. 16. 

 1880. Buccinulus albus, Hutton, Man. N.Z. Moll. p. 119. 

 1893. Tornatella alba, Hutton, Linn. Soc. N.S.W., Macleay Mem. Vol. 

 p. 37, pi. vi. fig. 2. 



This is a typical example of the genus. It is spirally and 

 closely sulcated, and longitudinal strise are distinctly seen in the 

 grooves. On one of the British Museum specimens several flat 

 ridges between the sulci bear a minor sulcation. The sutures are 

 not deep ; the outer margin of the aperture is extremely thin, and 

 is not sinuous anteriorly. 



