322 Proceedings of tJie Royal Society of Victoria. 



trace of five or six broadly separated spiral threads where the 

 whorl has its gi-eatest convexity ; the transverse folds parallel 

 to the lines of growth on the other hand increase in strength 

 and irregularity till on the base of the body-whorl the whole 

 surface is broken up by prominent undulations or growth folds 

 of varying strength, the base shows no spiral sculpture or 

 striations. The body-whorl falls away very rapidly to a long, 

 straight, robust canal. Suture of penultimate and body-whorls 

 somewhat canaliculate, outer lip slightly ascending on the body- 

 whorl and much thickened at its junction where there is a 

 «trong enamel pad of the posterior portion of the inner lip, 

 the enamel of the inner lip spreads well down and thins out to 

 the columella and is strongly margined by a groove at its outer 

 edge. In general aspect the adult retains the habit of the 

 young shell. 



Dimensions. — Length without the embryonic whorls, 200 

 mm. ; estimated perfect length, about 210 mm. ; breadth, 84 

 mm. ; length of aperture, 56 mm. ; breadth of aperture, 32 

 mm.; length of aperture and canal, 116 mm. 



Locality. — Clays of the Old Cement Works, Balcombe's Bay, 

 Clays of Grice's Creek and Coast sections, Mornington. Coast 

 section Gellibrand River ; Clays of the NeAvport shaft ; Clays 

 of Orphanage Hill, near Geelong, and Mirrghebuloc, Barwon 

 River ; Low^er Beds of Muddy Creek. — Balcombian. — Eocene. 



Clavella platystropha, sp. nov. (PL XVIII., Figs. 4, 5). 



Description. — Shell large, elongate fusiform, with an elongate 

 spire composed of rather flattened whorls with a much elon- 

 gated slender columella and canal. 



Spire whorls nine in the adult form without the mammillate 

 embryo. The first two spire whorls flat, the third slightly con- 

 vex below the middle, the fourth and fifth with increasing: sub- 

 median convexity, posterior slope long and gradual and flat- 

 tened or slightly concave to the suture, slope to the anterior 

 suture rather more sudden, the remaining spire-whorls flattened 

 or only slightly but regularly convex. Body-whorl flatly convex 

 to the periphery, thence falling away very rapidly to the snout. 

 On the first spire-whorls the sculpture is very faint, on the 



