PATELLA. 415 
rubrum,” &e.), has never been identified with satisfactory clear- 
ness; the recognition of it by Walch and Meuschen, in the 
‘Naturforscher, was proved to be erroneous by Schroter, who 
has himself cited no less than six engravings as illustrative, 
yet appended a note of interrogation to each of his references. 
This uncertainty, in which he was followed by Gmelin, who has 
generally accepted his: conclusions and copied his synonymy, 
was a necessary consequence of the meagreness of detail dis- 
played in the Linnean description. 
Two very dissimilar shells have been suggested as its repre- 
sentative, the Neritina crepidula, var. violacea, and a Crepidula 
delineated by Favanne, plate 4, figure E, 2. The latter has 
been proposed in the ‘Journal de Conchyliogie,’ but I suspect 
did not represent the species there designed, for it is declared 
in the text to be of an uniform brown tint, and not white with 
a red plate, as asserted by Récluz. The former has been 
doubtfully proposed by Martini, whose painting “t. 13, f. 133, 
134,” possibly in default of a more characteristic engraving, 
has been quoted by Linneus in his revised ‘Systema.’ The 
account in the ‘Museum,’ where, by-the-bye, the “ laterali” of 
the diagnosis was misprinted “ ovali,” would be applicable only 
to a bleached or eroded individual. 
Patella Chtnensts. 
The Calyptrea levigata of Lamarck (Deles. Rec. Coq. Lam. 
pl. 25, f. 8) is marked for this species in the Linnean cabinet. 
This might have been surmised from the language of the 
‘Museum Ulrice, the figure of Bonanni, and the Mediter- 
ranean locality. The reference, however, to the engravings of 
Argenville and Lister threw doubt upon that determination ; 
for although those drawings are not so dissimilar in outline to 
Chinensis proper, the words that accompany them, “une pointe 
saliant et repliée dans son sommet interieur” (Arg.) and “ stilo 
quodam interno—maculis quibusdam spiralibus” (List.), are 
far more applicable to C. extinctorium than to an uniformly 
white shell, with a spiral plate in its interior. The modern 
equivalent (“t. 546, f. 39”) of this reference to Lister was cited, 
indeed, in the revised ‘Systema’ for P. equestris, of which it 
