402 RALPH TATE. 
Genus Dissochilus, Cossmann, 1888. 
DISSOCHILUS VITREUS, spec. nov. (Plate 20, fig. 5.) 
Shell very small, conical, with an obtuse slightly flattened 
summit ; spire whorls five and a-half, semitransparent, shining, 
slightly convex, separated by a superficial suture, ornamented by 
engraved spiral lines (twelve to fifteen on penultimate whorl), 
equal, equidistant, and indistinctly punctate. Last whorl a little 
more than half the total length of the shell. Aperture oval, 
acuminate behind, a little dilated in front ; peristome continuous; 
columella-border truncated in front, arched, simple, slightly re 
flected, bordered externally by a narrow umbilical groove which 
is circumscribed by a thickish rim decurrent at the extremity of 
the columella; outer lip feebly thickened and slightly arched. 
Length 3, breadth 1:25 mm. 
Miocene, Muddy Creek, Victoria. 
Except that there is no parietal plication, this fossil has consider- 
able analogy with Dissochilus conicus, Cossmann ; it is evidently 
a member of the Lacunide, and is tenatively referred to Disso- 
chilus. 
DIssOCHILUS EBURNEUS, spec. nov. (Plate 20, fig. 6.) 
Shell ivory-white, smooth and shining, whorls five and a-half. 
Differs from D. vitreus by greater size, more prominent umbilical 
bourrelet, and aperture not so dilated. Length 3-25, breadth 
1-5 mm. 
Eocene, Muddy Creek, near Hamilton, Victoria. 
Family CeriTHiopsiID&. 
Genus Newtoniella, Cossmann, 1893. 
Syn., Ocrithiella, Verrill (non. Ceritella, Morris & Lycett, 1850); 
Lovenella, Sars, 1878 (non. Hicks, 1869); Newtonia, Cossman?s 
1891 (non. Schlegel, 1866). 
Examples, Cerithium Salteriana et C. cribarioides, Tenisov 
Woods. But there are a great number of species, belonging 
