PATELLA. AQ] 
Watella cxrulea. 
The Patella cerulea of Lamarck and Philippi (Martini, 
Conch. Cab. i. pl. 8, f. 64; pl. 10, f. 85, tolerably) is marked for 
this shell in the Linnean cabinet (plate 5, f. 9). The P. scutel- 
laris of Philippi (not of Lamarck), another form of this abundant 
and variable limpet, was included by our author in the species ; 
specimens of it are inscribed with the same numerals. It seems 
passing strange that naturalists should have successfully deter- 
mined an unillustrated species defined by four characters alone ; 
but the appended locality (for once correct) limited greatly the 
number of objects to be selected from. The revised ‘ Systema’ 
refers us to plate 9, figures D, G of Gualtier’s ‘ Index,’ drawings 
which, if not designed for cerulea, nevertheless exhibit its 
general aspect. 
Patella tubeveulata. 
In default of an adequate description, for even that in the 
‘Museum Ulrice’ is very brief, and in the absence of any 
pictorial synonym, it has proved impossible to ascertain, with 
positive certainty, what limpet was really designed by Linneus. 
Conchologists have either omitted it altogether from their lists, 
or have candidly acknowledged their inability to recognise it. 
Gmelin has merely abridged the original scanty details: 
Lamarck has queried it for his own P. tuberculifera, but that 
shell does not even possess the very few features that are 
required in tuberculata. 
The words of our author appear to harmonise better with 
certain specimens of Hmarginula tricostata (Pat. octoradiata, 
Gmelin, in part; List. pl. 532, f.11), which exhibit the colouring, 
nodosities and terminal bluntness that are attributed to the 
shell in question. No positive identification, however, can be 
established upon a basis of conjecture, for however precise may 
be the agreement, the shortness of the description permits not 
the hope that it will correspond with any one shell exclusively. 
