196 
flies. However, they are freely soluble with effervesence in acid, 
and are, therefore, probably the calcified shapes of rootlets, which 
from their small and uniform size may have belonged to a cyper- 
aceous or graminaceous plant. 
BLANDFORDIA STIRLINGI, spec. nov. 
Shell thin, subpellucid, of a pale flesh color, oval in outline, 
spire conical, apex obtuse or subacute, and slightly mammillated ; 
whorls six, rather rapidly increasing in size, moderately convex, 
but more rapidly declinous posteriorly, ornamented with slightly 
arched strie of growth, and in a spiral direction by a few 
threads. Aperture slightly oblique, inclining towards the 
columella ; peritreme entire ; columella effusively dilated over the 
umbilicus and basally. Umbilical fissure narrow, concealed by 
the columellar dilatation ; young shells imperforate. Operculum 
pellucid, its exterior face deeply concave ; nucleus subcentral, 
growth-lines slender, rather numerous, not coarse, few, and ele- 
vated as in B. striatula. 
Length, 6-5 ; width, 4°75; height of aperture, 3 mm. 
The short spire, more rapidly increasing whorls, not closely 
spirally lined, the more oblique aperture, and effuse inner lip 
distinguish this species from J. striatula. B. Starlingz has not a 
decollated spire, as is usual with its congener, but when the 
apical whorls are present in the latter they are of more regular 
increase. 
I do not know if B. Stirlingz be actually living, though it may 
possibly be so, as though all of the very numerous examples 
under observation, excepting one, are bleached and very fragile ; 
yet the unique exception shows slight coloration, the test being 
unaltered, and it contained an operculum. 
T bestow on this modest shell the name of my colleague, who 
has so largely promoted the exploitation of the extinct vertebrates 
in the region of its occurrence. 
Var. MAMMILLATA. 
Similar to B. Stirling2, but short and squat, somewhat resem- 
bling a Bathynia. Whorls five and a-half, the antepenultimate 
or penultimate suddenly increasing in size, and flatted at the 
suture, so that the posterior part of the spire appears mam- 
millated. 
Dimensions.—Length, 5-25; breadth, 3-5; height of aperture, 
2°75 mm. 
Locality—On the shore of a dry salt lake near Nannine, 
Murchison Goldfield, W.A., in great abundance (Mr. Victor 
Stretch). A few examples at Lake Callabonna. 
