FAMILY 10. PURPURIFERA. 213 
naturalist were guided, made him excessively cautious in the admission 
of new genera; he referred the Cassides to his genus Buccinum; and 
indeed it cannot be wondered that the generalizations of that author 
should have been.so circumscribed, when we consider how small an 
amount of material he had to work with, compared to what we command 
in the present day. Bruguiére revived the genus Cassis of Klein, with a 
full exposition of the species, in the ‘ Encyclopédie Méthodique’ ; and for 
fear that the word Cassis might induce the unlearned to suppose that all 
the shells of this genus are as large and ponderous as warriors’ helmets, 
he substituted that of Cassidea. Lamarck introduced the genus with its 
common appellative of Cassis, and, with the exceptio nof those species 
which he distinguished by the title of Cassidaria, retained it in exactly the 
same form as his immediate predecessor. 
A genus proposed by Stutchbury with the name of Cyprecassis, for the 
sake of distinguishing the Cassis coarctata and those allied to it, as being 
intermediate in their construction between the shells of the Cypree and 
those of the Cassides, has been abandoned: so also has an arrangement, 
proposed by Swainson, of reserving Bruguiére’s title of Cassidea for the 
purpose of distinguishing the Cassis erinacea and its cognate species. 
The shell of Cassis may be described as being ovate or triangular, and 
ending in a short but suddenly reflected canal, with the last whorl in- 
flated, and sometimes remotely strengthened with varices ; the aperture 
is longitudinal ; the columellar lip is often wrinkled, or granulated, and 
the outer lip thickened, reflected, and more or less toothed. 
Examples. 
Pl. CCLY, Fig..i. 
Cassis cuauca, Lamarck, Anim. sans vert., vol. vii. p. 221. Martini, 
Conch., vol. ii. pl. 32. f.342 and 343. 
Cassis cinerea, Klein, Rumphius, Martini, &c. 
Buccinum glaucum, Linneus. 
Cassidea glauca, Bruguiére. 
