94 



blunt-edged, edentulous. Columella with a strong terminal 

 spiral plait running out to form the left margin of a deep and 

 somewhat effuse canal. 



Length, 1 *5 ; greatest width, 1 mm. 



Tasmania ( IF. F. Petterd !). 



This species and 3f. lubrica are characterised among recent 

 Marginellidse by their uniplicate columellas, but that type has an 

 ancestral form in an Eocene species at Muddy Creek. In shape, 

 M. ovulceformis is somewhat intermediate between M. Flindersi, 

 with two plaits, and M. Hallii, with seven plaits; M. Isseli is 

 also near, but it has four plaits, and is not so attenuated at the 

 ends. 



Donovania fenestrata, spec. nov. 



Shell moderately stout, narrow lanceolar-fusiform, pale-fawn 

 colour. Pullus papillary of three, inflatedly convex smooth 

 whorls, somewhat rapidly diminishing in size. Spire-whorls five 

 and a-half, moderately convex, separated by a deeply impressed 

 suture ; ornamented with spiral and transverse ridges of equal 

 strength, which produce square deep fenestrations ; there are 

 five spiral ridges, and on the penultimate whorl there are about 

 twenty axial ones. 



Last whorl convex, with seven spiral ridges to the periphery — 

 three on the concave area below it, and four on the snout. 



Aperture roundly oblong, higher than wide ; outer lip entire, 

 vertical in contour, simple, ridged inside, corresponding with the 

 external furrows. Columella arched to its base, thence running 

 out abruptly and obliquely to form the left boundary of a short, 

 wide, slightly up-turned snout. 



Length, 8 ; width, 2*75 ; height of aperture, 2*75 mm. 



East Coast of Tasmania ( W. L. May). 



Natica Tenisoni, nom. mutand. 

 N. nana, Ten.-Woods, P.R.S., Tasm., 1876, p. 149, non Moller. 

 Long Bay ; Ten.-Woods. 



Thylaeodes caperatus, spec. nov. 



Shells agglomerate, reddish brown ; whorls embracing and 

 reciprocally adherent, forming a short broad cone, ornamented 

 with close-set, rounded, irregularly-sized, transverse ridges ; suture 

 distinct. The free tubular portion long, much narrow r ed, irregu- 

 larly bent, circular in section ; ornamented as the rest of the 

 shell. 



Diameter of base, 4 to 5 ; height of cone, about 2 ; length of 

 tube, up to 10 ; its diameter, 1 mm. 



Tamar Heads, Tasmania ; W. F. Petterd /. 



Animal unknown, but from its resemblance to some Tertiary 

 species in Australia it is associated with Thylaeodes rather than 

 with Vermetus. 



