318 SPECIES OF THE SYSTEMA. 
Grochus scaver. 
The cited figure of Argenville, which with more propriety 
might have been quoted for 7’. maculatus, displays no resem- 
blance to the features indicated in either the ‘Systema’ or the 
‘Museum Ulrice,’ and although the details in the latter publi- 
cation are very full, no satisfactory identification of the species. 
has been effected. Chemnitz, indeed, has delineated a shell 
which he has hesitatingly suggested as its representative, but 
the characters of it are so utterly dissimilar to the recorded 
ones, that Schréter, Dillwyn, and even Gmelin, though unable . 
to propose a better substitute, have expressed their doubts of 
its identity. Linneus did not himself possess an example, so 
that our sole hope of ever recognising it must rest in the 
‘Museum Ulrice.’ 
Trochus barits. 
The specimen contained in the marked receptacle of this 
species in the Linnean cabinet is precisely the shell thus 
named in the ‘Enumeratio Molluscorum Sicilie’ of Philippi 
(vol. i. p. 180, pl. 10, f. 19, tolerably). As its identification had 
previously rested upon no higher ground than the correspon- 
dence of the Mediterranean shell with the dozen words of the 
‘Systema’ (for the description was not accompanied by any 
pictorial definition), this confirmation is not unimportant. 
Trochus efwmevarius., 
The Trochus cinerarius of Montagu (Donov. Brit. Shells, 
vol. i. pl. 74, except middle figure) is marked for this species 
in the Linnean cabinet. How naturalists contrived to recognise 
the shell is not a little astonishing, for not only was the descrip- 
tion most utterly inadequate, and unillustrated by any synonym 
(for the account in the ‘ Fauna Suecica’ is a mere transcript of 
