Al4 SPECIES OF THE SYSTEMA. 
PATELLA. 
qatella equesirts. 
This shell was so clearly defined in the tenth edition of the 
‘Systema’ that it has proved by no means difficult to recognise 
it; since all the figures quoted as illustrative (and Gualtier’s 
delineation is very characteristic) represented the Calyptrea 
equestris of Lamarck (P. Neptuni of Dillwyn), the features of 
which are not opposed to the description. 
Four perfectly distinct species were enumerated as varieties 
in the ‘Museum Ulrice ;’ a, ‘‘lamellis horizontalibus imbricatis” 
(Cal. tectum Sinense); b, “rugis transversalibus” (C. Dillwyni, 
Gray, the P. equestris of Dillwyn, a W. Indian Cup-limpet with 
an undulatingly indented surface, and almost invisible striule) ; 
g, “striis longitudinalibus inferne denticulatis” (C. equestris, 
proper); d, “rugis transversalibus—Pet. Gaz. t. 21, f. 11.” 
(C. extinctorium, Desh. ed. Lam. Anim. s. Vert.) 
The “extus perfoliata” of the twelfth edition applies solely 
to the variety a, which is the only one of the four absent from 
the Linnean collection, where the markings have only been 
preserved upon the variety d (List. Conch. t. 546, f. 39). The 
specific name should, however, be retained, on the score of 
priority, for the Calyptrea thus designated by Lamarck. 
Patella NevitotIea, 
The type of this species, which our author did not himself 
possess, must be sought for in the Royal Museum; a de- 
scription of it appeared in the ‘Museum Ulrice,’ which was 
exclusively referred to in the principal editions of the ‘ Sys- 
tema.’ From the absence of any pictorial synonym, the shell, 
although the specified characteristics are very striking (“labium 
