1% ^ Fi 
174 Couthouy's Remarks on 
side of a respiratory cordon, like the teeth of a comb, as 
in the. Umbrella, instead of being, as in the Patella 
proper, disposed around the body, between the foot and 
the mantle. To a genus thus singularly uniting an 
animal of the Monopleurobranchiata, Blainville, with a 
shell like that of a Patella, (now belonging to his Infe- 
robranchiata) they gave the appellation of PATELLOIDEA. 
This name, though objectionable from its having been 
previously adopted by M. de Blainville for the third 
family of his Monopleurobranchiata, comprising the Um- 
brella and Siphonaria, has been retained by M. Deshayes 
in his recent edition of Lamarck, in preference to Mr. 
Sowerby's name, Lottia, as being the first published. 
Mr. Sowerby's characters were, moreover, incomplete, 
from being founded on the shell alone. | He was struck 
- with the great symmetry existing among certain species 
of Patella, and proposed to assemble them. under the 
generic title of Lóttia. Quoy and Gaimard however, 
assure us, that it is impossible to distinguigh the genera 
by the shell alone. 
The Patelloidea which have, been hitherto found are, 
for the most part, small, fragile and sub-diaphanous. 
The naturalists just mentioned describe about a dozen 
species, chiefly from the coasts of New Holland and 
New Zealand ; and J apprehend that PaTELLA cerilea 
and P. pellicida, Linn., inhabiting the shores of Europe 
will, on examination, be found to pertain to this genus. 
One of the ehanges in classification consequent upon 
this discovery must be, the suppression of M. de Blain- 
villes family Retifera, the first in his order Cervico- 
branchiata, and instituted solely for the reception of the 
Patelle. He was led to this by the supposition, that a 
