Palaeontolog 1/ of fJte Older Tertiary. 331 



Collonia otwayensis, sp. nov. (PI. XVIIL, Fig. 6, 7). 



Description. — Shell small, tumidly turl^inate, rather solid, con- 

 sisting of abovit five convex whorls with a blunt apex. 



Whorls smooth to the unaided eye, but a lens shows fine 

 regular spiral striae; whorls convex, suture faintly margined, 

 earlier whorls more embracing tha)i the body-whorl which runs 

 down rapidly on the penultimate whorl with a more strongly 

 defined suture. Base non-umbilicate, umbilical region margined 

 by a faint ridge in the adult, which in more senile forms tends 

 to break up into granules. Aperture roundly ovate, outer lip 

 thickened, but bevelled off from the interior to a sharp outer 

 edge. Columella slightly thickened and faintly effuse anteriorly, 

 enamel of inner lip ascends to join the outer lip at the posterior 

 extremity. 



Dimensions. — Greatest diameter, 4 mm. ; height, 4 mm. ; dia- 

 meter of aperture, 2 mm. ; also specimens of height, 3 mm. ; 

 diameter, 3 mm. ; and height 2.5 mm., by diameter 2 mm. 



Locality. — Clays and sandy clays of the Cape Otway section 

 near Point Flinders, and the Aire coastal section. — Jan Jukian. — 

 Eocene. 



Canthapidus serratulus, sp. nov. (Pi. XIX., Figs. 5, 6). 



Description. — Shell of medium size, trochiform, of erect habit, 

 acute spire, small apex, well impressed sutures, fine delicate orna- 

 ment, and flat base. 



Apex composed of a very small embryo of about a whorl and 

 a half, the first whorl smooth and enrolled at right angles to the 

 axis of general enrolment of the shell, and with the tip im- 

 mersed, the remaining half-turn of the embryo is delicately ;os- 

 tulate, thence the earlier clathrate sculpture of the spire pre- 

 vails. Spire whorls eight, flat, or slightly convex between the 

 sutures, the first three spire-whorls with a fine clathrate orna- 

 ment owing to about three of the stronger spiral threads being 

 crossed by numerous costulae of the same strength, with a 

 slight beading or noding at their intersections. The remaining 

 spire-whorls bear from five to eight or nine fine granulosa 

 spiral threads of varying strength ; in some specimens fair 

 uniformity prevails, whilst in other examples some two or three 



