113 



CHAPTER XIX. 



A "WALK ON THE BEACH. — CHITONS, — LIMPETS. — THE FINNY TRIBES DIS- 

 TINGUISH SPECIES. — ACM^A. — PILIDIUM. — DENTALIUM. — PILEOPSIS. 

 — CALYPTE^A. — riSSURELLA.— PUNCIURELLA. — EMARGINULA. 



THE LIMPET TRIBE. 



CHITONID^, PATELLIDiE, DENTALIAD^, CALYPTR^AD^, 

 nSSURELLID^. 



We find life in some places wliere it is little expected. 

 Where all is quiet and seeming inanition, one who looks 

 closely into nature may discover forms of vitality unknown 

 to a casual observer. You walk down to the sea-beach, 

 when the receding waves have left bare a portion of the 

 strand, and the rays of the setting sun are illuminating the 

 distant hazy region, where sea and sky appear to meet. 

 You are alone : you see nothing but the expanse above and 

 below and the rugged rocks at your feet, you hear nothing 

 but the roaring of the restless w'aves against them. In the 



I 



