CONCHOLOGY. 



13: 



narrow ; summit terminal. Found in 

 seas, and one species in Florida. 

 Five fossil. 



Strombus gigas. — -^ 



S. latissimus. 



S. Canarium. 



S. vittatus. 



S. gallus. 



y. cristatus. 



S. bubonius. 



S. auris-Dianas. 



S. pyrulatus. 



S. Luhuanus. 



S. colomba. 



S. troglodytes. 



S. urceus. 



S. lineatus. 



S. turritus. 



the Indian and Equatorial 

 Thirty-two living species. 



Strombus accipitrimus. 



S. tricornis. 



S. Isabella. 



S. epidromis. 



S. bituberculatus. 



S. dilatus. 



S. lentiginosus. . 



S. pugilis. n 



S. gibberulus. 



S. Mauritianus. 



S. succinctus. 



S. tridentatus. 



S. plicatus. 



S. papilio. 



S. marginatus. 



S. cancellatus. 



S. Floridus.'' 



FAMILY XIX. 



PuRPURiFERA. Elcven genera. 



I. Genus Cassidaria. PI. XII. 



Jnimal. 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 branchiae, nearly 

 parallel. 



Shell. Sub-globular, tuberculated or channeled, with a short, 

 pointed spire ; aperture long, ovate, subcanaliculated anteriorly ; 

 12* 



