FAMILY 2. CAPULACEA. 35 
Examples. 
Pl. CXLV. Fig. 1 to 9. (fossil.) 
Hrpronyx cornucopia, Defrance, Journ. de Phys., 1819. f. 1. De 
Blainville, Manuel de Malacologie, pl. 50. f. 1. 
Patella cornucopia, Knorr. 
Pileopsis cornucopia, Lamarck. Deshayes. 
Pl. CXLY. Fig. 10 to 16. (fossil.) 
Hipponyx Lavis, Sowerby, Genera of Shells, No. 1. 
PILEOPSIS, Lamarck. 
Testa pileiformis, obliqué conica, epidermide subvelutina induta ; vertice 
uncinato ; apertura magna, rotundato-elliptica ; impressionibus mus- 
cularibus duabus lateralibus, anticé rotundatis, posticé connatis. 
In the course of our observations on the preceding genus, it may have 
been noticed how entirely we differ from Sowerby in the views which we 
have formed of the true nature and organization of the Hipponyces ; they 
were regarded by this intelligent naturalist as true acephalous mollusks, 
brachiopodous, and wholly enveloped in a bilobed mantle; we, on the 
contrary, have laboured, and we think successfully, to restore the affinity 
traced in them by Lamarck with the Pileopses, an affinity which is advo- 
cated in the present day both by De Blainville and Deshayes. They 
were set apart by Linnzus, Lister, and the early naturalists, on account 
of their cap-shaped growth, as a particular section of Patella, but were at 
length distinguished as a genus by De Montford under the title of Capu- 
lus, and by Lamarck under that which we have here adopted. The Pile- 
opses evidently become fixed, without the power of displacing themselves ; 
they resemble the Hipponyces in possessing the property of forming for 
themselves a suitable place of attachment upon other shells, but not in 
that of depositing a protective cup or plate. 
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