150 CONCHOLOGY. 



spire, with a sinus in the lower part not contiguous to the 

 body. 



Pteroceras truncata. Pteroceras pseudoscorpio, 



P. lambis. P. scorpio. 



p. millepeda. P. aurantia. 



P. chiragra. 



P. chiragra. The Devil's Claw. PI. 28, fig. 3. 

 Tuberculated, with six digitated, canaliculated rays, closed 

 in the adult shell ; outer hp internally striated. 



P. scorpio. The Scorpion Pteroceras. 

 Species with digitations on the external edge, varying in 

 number from six to ten. 



3. Strombus. The Wing Shell. Thirty-two species. 



As now defined and characterized by Lamarck, is easily 

 distinguished by not having the winged aperture on the right 

 side dentated or digitated, and the sinus therein always sep- 

 arated from the canal. 



In some species the exterior is variously striated, smooth, 

 wrinkled longitudinally, or tuberculated ; the interior pre- 

 sents vivid and beautiful colours. 



These shells frequently attain a large size and great so- 

 lidity. 



Shell thick, sub-involute, diconic, or ventricose, terminated 

 like a cone before and behind ; aperture very long, narrow, 

 terminated anteriorly by a canal more or less elongated, re- 

 curved ; the edges parallel ; the external dilating with age, 

 offering behind a gutter at its attachment to the spire, and 

 before a sinus more posterior than the canal, through which 

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

 narrow, with elements as if imbricated; the summit terminal, 

 Strombus gigas. Strombus Canarium. 



S. accipitrinus. S. Isabella. 



S. latissimus. S. vittatus. ; 



3. tricornis. S. epidromis. 



