330 Proceedings of the Royal Society of Victoria. 



Dimensions. — Height, 34 mm. ; greatest diameter, 37 mm. ; 

 diameter of aperture, 15 mm. ; diameter of umbilicus, 5 mm. 



Locality. — Upper beds of tlie Grange Burn, near Hamilton, 

 Western Victoria. — Kalimnan. — Miocene. 



Observations. — This species shows a close relationship with 

 our common living species. Turbo undulatus, Martyn, and might, 

 on a casual examination, be mistaken for that species, but the 

 more striking distinguishing features axe in the sculpture, the 

 beaded ornament near the suture, the strongly sculptured base, 

 the smaller umbilicus, the stouter columella, and the more erect 

 aspect. 



Collonia geelongensis, sp. nov. (PI. XA'"!!!., Figs. 8, 9). 



Description. — Shell small, turbinate, and composed of about 

 four slightly convex whorls. Apex blunt and depressed, with a 

 smooth embrj'^o. Suture distinct when not masked by one of the 

 revolving keels. 



Shell bearing four strong revolving keels or spiral threads on 

 the earlier spire-A\'horls, these keel's appear regularly beaded, the 

 keels next the anterior and posterior sutm-es bearing slightly 

 finer beads ; on the penultimate and body-whorls the grooves 

 between the keels become deeper, and the keels strong, and the 

 beading resolves itself under the lens into forwardly projecting 

 frills. Interspaces and keels very finely lamellosely striate trans- 

 verse to the keels. Base very slightly convex, distinctly but 

 minutely umbilicate, and ornamented with about three keels of 

 the same character m, on the upper part of the body-whorl, occa- 

 sionally a minute fourth keel may be detected within the um- 

 bilicus. Peristome complete, orbicular and contracted internally, 

 wider externally owing to the strong bevelling oft' from the 

 interior to the thin edge, this characteristic appearance of the 

 aperture is much intensified by the decurrency of the posterior 

 suture. ^ 



Dimensions. — Greatest diameter, 5 mm. ; height, 5 mm. ; ex- 

 ternal diameter of aperture, 2.5 mm. ; internal diameter of 

 aperture, about 1 mm. 



Locality. — Clays over Polyzoal Rock, Filter Quarries, Bates- 

 ford, near Geelong. — Balcombian. — Eocene. 



