93 
The description of M. denticulata, Tate, is inapplicable, because 
it was based on two species—one specimen supplied the charac- 
ters “ denticulated margin and four-plicate columella" with exsert 
spire (it is a young micromorph of A. Strangei); the other, 
* pyriform shape and immersed d gr a smooth outer lip 
and multiplicate columella, is M. Simso 
Marginella Mayii, Tate (spec. nov. ). 
Shell of an elongately oblong-oval shape; the body-whorl 
rather rapidly tapering from the nn shoulder to the base ; 
spire obtusely conical, blunt at the a 
Test thick, smooth, polished. Rennie colour chestnut-brown, 
relieved on the spire by lighter colour at the posterior sutures ; 
band at about the posterior one-third, and eae at the base; the 
dark coloured bands are dee eper €— > ir margins; the 
thickened aperture, all round, is opaque 
horls five, nearly flat ; the last convex re and of an 
even slope thence to the s 
wide media ally, narrowing thence to the front to about half. 
Outer lip thickly and broadly callously thickened on the outside, 
ascending to about one-half the height of the penultimate uii 
denticulated within (except towards the extremities). Colum 
stoutly four-plaited, plaits d the posterior pair more 
transverse than the anterior pai 
Total length, 12 ; length of aperture, 9 ; maximum width, 6 mm. 
Frederick Henry Bay (type) and East Coast of Tasmania 
(W. L. May); Derwent Estuary (#. Harrison). 
Among Australian congeners M. Mayii comes near to 
M. pygmea, but is of very much larger size; it is, moreover, 
more attenuated anteriorly, and especially differs by its outer ^4 
variced outside and denticulated within ; also near M. AU 
which it resembles in its denticulated outer lip aia oain 
Mariik ovulæformis, spec. nov. 
Shell minute, ovate, attenuated at the ends, regularly convex, 
white, shining. Spire concealed, the aperture extending back- 
ward beyond in 
Apertu rrow, arcuate, bluntly rounded ee 
lightly er to the front, ending 
emargination, which is curved to the left. Outer lip a 
