GASTEROPODA. 209 
Length an inch and three-eighths; breadth seven-eighths of an 
inch. 
Brought with New Holland shells. 
About the size and form of H. stomatie-formis, Reeve, but distin- 
guished from all others by its crowded angular ripples, arranged some- 
what like the colours on H. ziczac. No shell approaches it in this 
respect except the very young of H. australis. 
Figures 248, 248 a, aperture and back of the shell. 
STOMATELLA TuMIDA (Gould). 
Testa subglobosa, ampullacea, tenuis, nitida, cinereo-olivacea, prope 
suturam albido et rufo seriatim maculata et lineolis sagittatis vittata, 
subtus flavescens, sulcis remotis cincta, sulcis basalibus fusco-articu- 
latis: spira anfractibus quatuor tumidis: apertura circularis intus 
margaritacea; labro acuto, albo; columella revoluta, callo copioso, 
erecto, albo, striato marginata. 
Stomatella tumida, Goutp ; Proceed. Boston Soc. Nat. Hist., iii. 74. 
November 1849. Expedition Shells, 51. 
SHELL subglobose, thin and light, polished, of an ashy olive-green 
colour, pale and yellowish beneath, with distant revolving ridges, 
which are abrupt above and slope downwards: there are six or eight 
of these on the upper whorl, and eighteen or twenty on the body 
whorl ; about four of the basal ridges are tessellated with bluish-black, 
and more or less of the others above (four or five conspicuously so) 
are most delicately veined with white and brown, angular, invaginating 
spots exhibiting so many delicate bands; near the suture it is usually 
blotched with alternate white and brown; lines of growth distinct, 
distant, shallow. Whorls four, forming a prominent spire, broadly 
inflated. Aperture circular; lip sharp, a little sinuous above, at the 
junction ; columellar edge everted, so as to form a rounded pillar, mar- 
gined by a thick, white, grooved lunate callus, not closely appressed 
at the outer edge ; interior silvery, and exhibiting the external sulci. 
53 
