1877.] MR. G. F. ANGAS ON NEW MARINE SHELLS. 39 
shining, white; whorls 4, convex; the last large, rounded at the 
periphery; aperture circular, peritreme continuous, slightly thickened 
on the columellar margin. 
Alt. 1 line, breadth 1 line. 
Hab. Found in shell sand, Botany Bay, New South Wales. 
This little shell differs from Crossea, A. Ad., in the absence of the 
basal tooth so characteristic of that genus. It will not-agree with 
Putilla, A. Ad., as in the latter genus the peritrenie is not con- 
tinuous ; nor can it be referred either to Microthyca, A. Ad., or 
Umbonella, A. Ad. I place it provisionally amongst the Trochide. 
ETHALIA BRAZIERI, sp. nov. (Plate V. fig. 17.) 
Shell depressedly orbicular, white, shining, semitransparent, smooth, 
with numerous fine concentric impressed lines both above and below 
the sutures and at the base of the last whorl; whorls 33, rapidly 
increasing ; suture impressed, with a narrow opaque band; last 
whorl rounded at the periphery; base slightly excavated; aperture 
subcircular ; outer lip thin, arcuate; columella with a moderate 
callus expanded over the umbilical region. 
Diam. 2 lines, alt. 1 line. 
Hab. Shell sand, “ Sow and Pigs”’ reef, Port Jackson (Brazier). 
Myonta sinvata, n. sp. (Plate V. fig. 18.) 
Shell elongately turreted, thin, semipellucid, white, transversely 
striated with narrow, equidistant, opaque diaphanous lines, and 
crossed on the last whorl with extremely delicate longitudinal striz ; 
whorls 8, convex ; sutures channelled ; aperture ovate, angled above, 
rounded below; columella arcuate, a little flattened and reflected 
over the body-whorl; outer lip deeply sinuous above, forming a 
sharp angle at its junction with the last whorl, rounded and effuse 
below. 
Alt. 34 lines, diam. 14 line. 
Hab. Dredged on the ‘“‘Sow and Pigs” bank, Port Jackson 
(Brazier). 
Although in this shell the slight plait or twist on the columella 
is not discernible, it otherwise resembles a Myonia; and I have 
therefore placed it in that genus, which belongs to the Acteonide, 
rather than with Monoptygma or Menestho. The sinuous outer lip 
is a remarkable feature in this species. 
ToORNATINA HOFMANI, n. sp. (Plate V. fig. 19.) 
Shell cylindrical, white, very finely striated by the lines of growth, 
with a few distant irregular transverse strize discernible towards the 
lip on the body-whorl ; whorls 53, the upper ones slightly convex, 
and channelled at the sutures, the last a little shouldered above and 
very slightly concave in the middle ; apex sharp ; aperture narrow 
above, dilated below, and rounded at the base ; outer lip thin, arched 
when viewed laterally, and slightly contracted in the middle ; colu- * 
mella somewhat thickened below, with a small blunt flexuous pro- 
