.BRANCH MOLLt'SCA. 



right side, below the rudimentary shell, the large open- 

 ing, valve-like in structure, which leads into the "lung." 



The few remaining 

 forms are marine. 



FIG. 65. 



I 



FIG. 66. 



Li' max cam pes' trig. Slug. 



Fig su rel' la Vis' ter i. Key-hole 

 Limpet. 



ORDER ZYGOBRANCHIA (zi go brang'ke a). 



The Limpets (ilm'pets) are abundantly found at .ow 

 tide attached to stones, etc. So firmly can they hold to 

 their attachment, by means of their broad, flat foot, that 

 the shell can be broken before they will loosen their 

 hold. The Key-hole Limpet has a small opening at the 

 apex of its shell. 



The Ear-shells, of the Pacific Coast, also live attached 

 to the rocks. Their shells, of a pearly luster, with re- 

 splendent metallic hues, are often sawed in pieces and 

 used in the arts for various ornamental purposes. 



FIG. 67. 



FIG. 68. 



Ha lid' (is afo a lo'ne. Ear-shell. 



Cyprce'a fl' gris. Cowry-shell. 



The Cowries (kow'rlz) are often used as ornaments, 

 the Tiger Cowry being most abundant. 



The Conch (k6ngk), or Strorribus, a large, heavy shell, 



