119 
(there are about nine rows of rhombic spaces in a radial distance 
of 2 millimetres measured from the periphery). The margin of 
the aperture is closely crenulate-serrate. The fissural band is 
margined on each side by an elevated rounded keel, which is 
crenately sculptured ; the scars on the fissural band are arched, 
sharp and close, but not contiguous. 
The inside is glossy and smooth ; the septum is narrowly cres- 
centic (extending in the middle line to about one-fifth and on the 
sides to about one-fourth of the length of the aperture), much 
depressed posteriorly (about one-half the depth of the shell) be- 
coming shallower on the anterior border, which almost reaches 
the base of the shell. 
Dimensions.—Antero-posterior diam., 9°5; lateral diam., 6°; 
height, in about the middle line, 2° (vix); depth of cleft, 2 milli- 
metres. 
Localities.—Corney Point, Spencer Gulf, one example from 
shell-sand (Dr. Perks), dredged in 7 to 20 fathoms in Backstairs 
Passage, five dead examples (Dr. Verco). 
Remarks.—Mr. Beddome’s definition of the genus and species 
of Legrandia Tasmanica reads as follows :— 
‘“‘ LEGRANDIA, shell emarginulaform, but with an internal plate 
like Crypta. 
LEGRANDIA TASMANICA, shell oval, radiately ribbed ; front edge 
fissured ; interior with a shelly plate extending one-fourth the 
length of the shell. Long., 5 mill.; lat., 3 mill. ; alt., °75 mill. 
Habt., Kelso Bay, Tamar River, 17 fms.” 
The specific description barely permits of a comparison with 
the South Australian specimens, though there is a substantial 
agreement in the size of the internal plate, and the exterior 
dimensions are proportionately the same, the measures of the 
Tasmanian shell being about one-half of the largest of the South- 
Australian specimens. 
Without comparison of actual specimens it is impossible to 
establish identity, though there is presumptive evidence that the 
two shells belong to one species. In this latter consideration I 
have thought it best, as is the practice in botanical nomenclature, 
when a generic name is suppressed to employ it as a specific 
name for the type-species, and so preserve the intention of the 
original author, in this case to compliment the veteran concholo- 
gist of Tasmania, Mr. Legrand. 
Of the three living species diagnostically known and figured, 
Z. Legrandi seems to resemble Z. calceolina more than the others ; 
but in one particular it differs from all, namely, by its apex 
situated within the vertical plane of the posterior margin, and 
not as in them projecting beyond the periphery. 
