C0NCH0L06Y. 127 



margin distant from the body. Found in the Equatorial seas. 

 Seven species. Five fossil. 



Pteroceras truncata. Pteroceras chiragra. 



P. lambio. P. niillepeda. 



P. Scorpio. P. pseudoscorpia. 



P. aurantia. 



3. Genus Strombus. PL XII. 

 Ayihnal. Spiral ; the foot rather wide anteriorly, compressed 

 posteriorly ; mantle thin, forming a prolonged fold anteriorly, 

 whence issues a sort of canal ; head very distinct ; mouth a ver- 

 tical slit at the extremity of a proboscis, provided in the inferior 

 median line with a lingual band having prickles flexed posteriorly ; 

 tentacular appendages cylindrical thick and long, with the eyes 

 at their extremity. 



Shell. Thick, subinvolute, dilated in the middle, terminating 

 in a cone anteriorly and posteriorly ; aperture very long and 

 narrow ; terminated anteriorly by a canal more or less elongated 

 and flexed ; edges parallel, the external dilating with age, pre- 

 senting posteriorly a gutter at its point of attachment with the 

 spire, and, anteriorly, a sinus behind the canal, through which 

 the head of the animal passes; operculum horny, long, and 

 narrow; summit terminal. Found in the Indian and Equatorial 

 seas. Thirty-two living species. Five fossil. 



Strombus gigas. Strombus accipitrinus. 



S. latissimus. S. tricornis. 



S. Canarium. S. Isabella. 



S. vittatus. S. epidromis. 



S. gallus. S. bituberculatus. 



S. cristatus. S. dilatatus. 



S. bubonius. S. lentiginosus. 



S. auris-Dianse. S. pugilis. 



S. pyrulatus. S. gibberulus. 



S. Luhnanus. S. Mauritianus. 



S. colomba. S. succinctus, 



S. troglodytes. S. tridentatus, 



S. urceus. S. plicatus. 



S. Floridus.* S. papilio. 



