CARDIUM. 45 
in the works of Bonanni, Lister, and Petiver, books habitually 
consulted by Linnzeus, were passed over in silence by him. 
Celina Dtiyitarta. 
The Lucina digitaria (Philippi, Moll. Sicil. vol. i. pl. 3, f. 19) 
is present in the collection, and alone exhibits the required 
characteristics of the definition. The peculiar sculpture of the 
species rendered its identification an easy task. The locality, 
being authenticated, proves correct. 
Selina covwea. 
Thanks to Lister’s figure, and to the description in the 
‘Fauna Suecica,’ this species has long ago been identified with 
certainty. Its modern name is Cyclas cornea (‘Turton, Dithyra 
Brit. pl. 11, f. 14). 
CARDIU M. 
In the revised copy of the ‘ Systema’ the term “ alternatis,” 
in the diagnosis, is changed into “ recurvis,” and “ Nymphe 
eminentes retrorsum presse” is added to the definition. 
Cardiuw costatiny, 
The Cardiwm costatum (Wood, Gen. Conch. pl. 56, f. 1) of 
authors is still to be found in the typical collection, and alone 
agrees with the description and synonymy of this species. 
