narrow ; summit terminal. 
CONCHOLOGY. 
137 
Found in the Indian and Equatorial 
Thirty-two living species. 
seas, and one species in Florida. 
Five fossil. 
Strombus gigas. 
Strombus accipitrimus. 
S. latissimus. S. tricornis. 
S. Canarium. S. Isabella. 
S. vittatus. S. epidromis. 
S. gallus. S. bituberculatus. 
S. cristatus. S. dilatus. 
S. bubonius. S. lentiginosus. 
S. auris-Diane. S. pugilis. 
S. pyrulatus. S. gibberulus. 
S. Luhuanus. S. Mauritianus. 
S. colomba. S. succinctus. 
S. troglodytes. S. tridentatus. 
S. urceus. S. plicatus. 
S. lineatus. S. papilio. 
S. turritus. S. marginatus. 
S. cancellatus. 
S. Floridus.* 
FAMILY XIX. 
Purrurirera. Eleven genera. 
1. Genus Cassidaria. Pl. XII. 
Animal. Somewhat elongated, widened anteriorly ; mantle 
with simple edges and provided with a distinct tube; foot very 
wide, elliptical, sub-biolate anteriorly, and having a large opercu- 
lum upon the dorsal face of its posterior part; head wide and in- 
distinct ; tentacula anterior, approximating at base, sub-cylin- 
drical, and having the eyes at two-thirds of their length; mouth 
inferior, concealed by the foot; two pectiniform branchie, nearly 
parallel. 
Sheil. 
Sub-globular, tuberculated or channeled, with a short, 
pointed spire; aperture long, ovate, subcanaliculated anteriorly ; 
12 
