50 SPECIES OF THE SYSTEMA. 
Cardin magia. 
Our author neither possessed this shell, nor has added 
ought respecting it in his revised copy of the ‘ Systema.’ 
Unless the described specimen in the Dronningen Museum 
should prove an otherwise unknown species, the name magnum 
must disappear from our catalogues, for so inadequately has 
Linneus described it that even his own son was unable to 
recognise it: he surmised, however, that it might be Cardiwm 
leucostoma (figured for it by Wood), but both size and colouring 
are against the hypothesis. All conchologists seem to have 
agreed that the very limited number (19) of ribs ascribed to it 
in the ‘Museum Ulrice’ was a typographical error for 29 or 39; 
Chemnitz, taking the former number as the correct reading, 
regarded it as identical with the Cardiwm rugosum, at least his 
figure (191) is usually quoted for that shell; the “anus ut in 
C. muricato,” where its area is said to project at the margin, is 
rather opposed to this identification, which nevertheless is not 
devoid of some probability. To Born’s idea I cannot for a 
moment assent; “the shape of his shell (the C. ventricosum of 
Lamarck) does not at all correspond to the term “ oblonga.” 
Spengler refers for an illustration to a figure in Seba, which 
bears much resemblance to, and indeed is usually quoted for, 
the C. elongatwm of Bruguiére, an extremely large shell with 
39 or 40 ribs, which agrees so remarkably well with the details 
of the ‘Museum Ulrice’ as to be queried for “ magnum” by 
Bruguiére himself. However inclined to assent to this deter- 
mination, I prefer the wise reserve of Dillwyn, who, whilst 
stating the opinion of others upon the subject, avoids pro- 
nouncing himself upon so conjectural a matter. 
Caroatun flav. 
As is wont to occur when Linneus did not himself possess 
the type, which was unfortunately the case in regard to this 
ambiguous species, he has added nothing in his manuscript to 
the published description. The specimen in the Dronningen 
