1919.] Two Albino Varieties of Cyprza erosa Lin. 145 
weathered and bleached, which, moreover, would not account 
for the characters of the vitreous dorsal spots. Such vitreous 
spots are occasionally seen in normal specimens in which, 
however, they alternate with the usual opaque spots, besides 
which they are always situated on a coloured ground. In 
the present instance, there is a complete reversal of the usual 
disposition, the ground having acquired the opaque whiteness 
that usually characterises the spots. 
CyPR2A EROSA, Linnzeus, var. PURISSIMA Var. nov. 
In shape, this shell corresponds with the previously 
described variety, except that the dorsal rim is narrower. 
The ventral ridges and dorsal crenulations are less extremely 
prominent than in the previously described variety. 
The entire shell is of a brilliant pure white and of a 
porcellaneous texture. Even the usual lateral blotches are 
missing. The dorsal spots are scarcely visible, being merely 
still more opaque and therefore still whiter than the surround- 
ing ground. 
Dimensions :— 
Height ea is aa ee 
Width es ee ARES = ieee 
Dorso-ventral diameter .. — pS epee 
Occurrence.—According to a detached label, this shell is 
from Moreton Bay (Queensland). A slight doubt as to the 
correctness of this occurrence is due to the fact that in the 
same box containing this shell are two specimens of Cypraea 
eburnea Barnes, to which the label undoubtedly refers. The 
Comparison.—This shell is still more intensely white than 
the previously described variety kaolinica. The only other 
nes, W is re 
shaped outline, the feebly developed dorsal rim, the much less 
pronounced ventral outer extension of the apertural denticula- 
ms. 
ote.—The variety subalba Smith, from Aden, is presum- 
is d in the 
N 
ably partly white or pale-coloured. It escribed in 
Nautilus (Vol. XXVI, p.78), a publication not available in 
India. 
