464 



THE OCEAN WORLD. 



3o6. Strombus luhuanus Fig. 307. Strombus can- FK 

 (Linnaeus). cellatus (Lamarck). 



Strombus thersites (Gray), 



Fig. 309. Pteroceras srnrpin 

 (Linnaeus). 



310. Pteroceras millepeda 

 (Linnaeus). 



irom those of Strombus chiefly in this, that the right edge develops 



: with age into long and slender digital spines more or less 



numerous, the numbers of which vary according to the species. The 



