92 SPECIES OF THE SYSTEMA. 
In the revised copy of the ‘Systema’ the more modern style 
of numbering (“t. 3868”) of Lister’s plate (copied from Bonanni) 
is substituted for the older and more tedious mode, and the 
reference to the letters I, G of Gualtier’s engraving expunged, 
which leaves the synonymy tolerably correct. Bonanni, usually 
so inaccurate in his delineations, has represented the peculiar 
pattern of incised lines upon the ligamental area which dis- 
tinguishes the European species from its nearly-allied con- 
geners of Asia and America. 
Area barbata. 
In the marked receptacle of this shell in the Linnean cabinet 
is still to be found a specimen (Reeve, Conch. Icon. 11. Arca, 
pl. 13, f. 83) of the Arca barbata of recent writers, which 
correctly agrees with the description of the species. 
Although, in the twelfth edition of the ‘Systema,’ the 
‘Museum Ulrice’ is referred to, there is no account of the 
species in that work; the barbata of the second edition 
(No. 2147, not 1147 as quoted) of the ‘Fauna Suecica’ is 
apparently the Ark called nodulosa by Loven. The figures in 
Seba and ‘ Mus. Tessin.’ represent the A. lacerata, a rare shell 
which Linneus did not distinguish from the common Mediter- 
ranean one, 
Arca wmodtolus. 
In the marked receptacle of this species in the Linnean 
cabinet reposes the W. Indian Modiola sulcata (Chemn. Conch. 
Cab. vol. viii. pl. 84, f. 754), a shell which precisely answers to 
the required characteristics of the definition. Our author has 
added in manuscript “ List. 366,” an error probably for 365, 
in which plate his species is correctly delineated, 
