CARDIUM. 47 
Mardi nvevtune. 
The Cardiwm medium of authors (Mawe, Conch. pl. 7, f. 1) 
remains in the box thus marked in the Linnean cabinet. The 
specimens described in the ‘ Systema’ had evidently been worn 
smooth (as is frequently the case with this species): hence 
“ porcis rugulosis”’ is added in the manuscript of the younger 
Linné: “ muricato-crenatis versus exteriora” is likewise re- 
marked concerning the ribs in the ‘Museum Ulrice,’ but the 
comparison of mediwm to Cardissa ! in that book throws some 
doubt upon the identity of the species described in the two 
different works. 
Cardin aculeatiunr. 
This species, which has long been identified by conchologists 
(Cardium aculeatum, Turt. Dithyra Brit. pl. 18, f. 6, 7), ori- 
ginally appeared as muricatum in the tenth edition of the 
‘Systema,’ and by a continuation of the same error was so 
termed in the ‘ Museum Ulrice,’ although the epithet aculeatum 
had been applied to it in the errata list of the earlier publica- 
tion. 
« Last. t..321, f 158.” and “ Pen. Zool. 4, p. 76, t. 50, £-37.7 
appear as additional references in the copy of the ‘ Systema’ 
that belonged to the younger Linné, whose father has not 
enumerated it among the shells in his possession. 
Cardituw echinatunr, 
The Cardium echinatum (Wood, Gen. Conch. pl. 49, f. 1, 2) 
of authors is marked for this species in the Linnean cabinet. 
