400 RALPH TATE. 
rank. Acteopyramis olivelleformis, is transferred to Acton in 
Family Actzonide. 
Genus EULIMELLA. 
Four minute species are known to me from the Eocene of 
Aldinga, Shelford, Gelibrand River and Belmont. 
Family Lirrorinip&. 
Genus Fossarus. 
FossARUs REFRACTUS, spec. nov. (Plate 19, fig. 9.) 
Shell minute, turbinate, minutely perforate, test thick not 
nacreous. Embryo of two whorls, the first papillary, the second 
rather flatly convex. Spire-whorls two and a half, antemedially 
augulated, the posterior slope somewhat steep, the anterior one 
nearly perpendicular ; ornamented by rounded relatively high 
threads, which on the posterior slope are nearly at right angles to 
the keel, thence backward inclined to the suture ; inter-spaces 
between the axial threads about twice as wide as the width of the 
threads. 
Last whorl with a semi-circular contour in the vertical plane, 
modified by the four strong keels which encircle the anterior two 
thirds of the base. The keels are inequidistant and slightly 
serrated by the crossing of transverse threads ; the first and 
second are in alignment with those visible on the penultimate 
whorl, the second peripheral ; the second, third and fourth about 
equidistant. The transverse threads are slightly backward-curved 
between the suture and the first keel, abruptly bent back betwee? 
the first and second, thence with a slight backward curvature to 
the umbilical fissure. Aperture polygonal, peristome entire, 
outer lip simple; columella concave; umbilical chink minute, 
bounded by an elevated ridge which joins the basal lip at its 
junction with the columella, there forming a slight insinuation. 
Eocene, Table Cape, Tasmania. 
This fossil recalls Trichotropis by its umbilical border, but its 
thick test and absence of distinct basal rostration remove 1 
1 Proc. Roy. Soc., N. S. Wales, Vol. xxvit., p. 181. 
