286 



COMPARATIVE ZOOLOGY. 



Wood-louse, or Sow-bng (Oniscus), so common in damp 

 places, the Slaters (Idotea), and the Sand-fleas {Oamma/rus), 

 seen by the sea-side. 



4. Beca/pods, having ten legs, as the Shrimp {Omngon), 



Fia. 266.— Lobster (Homarvs vulgaris). 



Fio. 257.— Swimmiug Crab {Platyonychits). 



