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 M. Strangei) ; the other, 

 " pyriform shape and immersed spire," with a smooth outer lip 

 and multiplicate columella, is M. Simsoni. 



Marginella Mayii, Tate (spec. nov. ). 



Shell of an elongately oblong-oval shape; the body-whorl 

 rather rapidly tapering from the rounded shoulder to the base \ 

 spire obtusely conical, blunt at the apex. 



Test thick, smooth, polished. General colour chestnut brown, 

 relieved on the spire by lighter colour at the posterior sutures ; 

 on the last whorl it is interrupted by a narrow light-coloured 

 band at about the posterior one-third, and also at the base ; the 

 dark coloured bands are deeper tinted at their margins ; the 

 thickened aperture, all round, is opaque white. 



Whorls live, nearly flat ; the last convex posteriorly, and of an 

 even slope thence to the snout. 



Aperture three-fourths the total length of the shell, narrow, 

 the outer lip making an acute angle posteriorly ; about 2 mm. 

 wide medially, 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 whorl ; 

 denticulated within (except towards the extremities). Columella 

 stoutly four-plaited, plaits subequal, the posterior pair more 

 transverse than the anterior pair. 



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 (E. Harrison). 



Among Australian congeners M. Mayii comes near to 

 M. pygmcea, but is of very much larger size ; it is, moreover, 

 more attenuated anteriorly, and especially differs by its outer lip 

 variced outside and denticulated within ; also near M. Allporti y 

 which it resembles in its denticulated outer lip and coloration, 

 but differs by longer and attenuated spire and larger size. 



I have much pleasure in adopting for this shell the name of 

 my coadjutor, under which name it has been distributed [R. Tate]. 



Marglnella ovulaeformis, spec. nov. 



Shell minute, ovate, attenuated at the ends, regularly convex^ 

 white, shining. Spire concealed, the aperture extending back- 

 ward beyond it. 



Aperture narrow, arcuate, bluntly rounded posteriorly, 

 slightly expanding to the front, ending there in a slight 

 emargination, which is curved to the left. Outer lip thin,. 



