VENUS. 69 
extracted from the tenth edition of the ‘Systema,’ and is not 
suited to Islandica. 
Venus Lslanditea. 
The Cyprina Islandica (Donov. Brit. Shells, pl. 77) of 
authors, the C. vulgaris of Sowerby, is marked for this species 
in the Linnean cabinet. The original specimen, judging from 
the description, had probably lost its outer coating. 
“TInt.” for “ margine integerrimo” and “ Pen. Zool. iv. t. 538, 
f. 47” were correctly added in the revised copy of the ‘ Systema.’ 
Plate 272, f. 108, of Lister’s ‘ Historie’ is also justly referred to 
in the manuscript of the younger Linné. The supposed Euro- 
pean forms of mercenaria really belong to this species, which 
was not constituted when they were erroneously referred to the 
preceding shell. 
Venus Chtone. 
As might be expected, the Cytherea Chione of conchological 
writers (Turt. Dithyra Brit. pl. 8, f. 11) is marked for this 
species in the Linnean collection. Of the figures referred to, 
those of Regenfuss and Gualtier alone accurately represent the 
species; the other two are approximations only. 
Venus maculata. 
The well-known Cytherea maculata (Chemn. ‘Conch. Cab. 
vol. vi. pl. 33, f. 8345) is present in the Linnean collection, and 
alone agrees with the description and synonymy. The figures 
cited were all probably intended for this shell, and caused its 
easy and early recognition. 
