. Cassell's natural history. Animals; Animal behavior. THE TEMEBO. 251 FVMIL\ Will—rilol VDIDl The characters of this family aie, shell fiee oi ^\lthlll i tubt %al\es equal, gaping at both ends, thin, white, brittle, armed in liont with i isp hke iniluitations, without hinge teeth, md stieng liingt, plate lelieved o\ei tht bi_ iks, uid tuiuished ith. PH0L4S BACTII SHELTER HOLLOWED 1)1 T B\ IT IN \ KIULK OF GVE1S<! thcued externally by accessoiy valves a long, curved inusculai- piocesb beneath each; anterior musculai impression on the hinge-plate, pallial sinus very deep. It In es perpendicu
. Cassell's natural history. Animals; Animal behavior. THE TEMEBO. 251 FVMIL\ Will—rilol VDIDl The characters of this family aie, shell fiee oi ^\lthlll i tubt %al\es equal, gaping at both ends, thin, white, brittle, armed in liont with i isp hke iniluitations, without hinge teeth, md stieng liingt, plate lelieved o\ei tht bi_ iks, uid tuiuished ith. PH0L4S BACTII SHELTER HOLLOWED 1)1 T B\ IT IN \ KIULK OF GVE1S<! thcued externally by accessoiy valves a long, curved inusculai- piocesb beneath each; anterior musculai impression on the hinge-plate, pallial sinus very deep. It In es perpendicularly in holes in the rock or sand. The Pholadidw perforate all substiinces that <ue softer than their own \alves (M. Cailliaud), but Mr. Hancock has pointed out that the foot appears to be a more eflicient instrument thiUi the shell foi burrowing into rock, seeing that its surface can be renewed is fast as it is worn away. Genus Pholas. The com mon Piddock is used for bait on the coast of Devon , its foot is white and translucent when fresh. It hastwo accessoiy valves to protect the umbonil muscle, with a small transverse plate behind ; a long unsvm metrical plate fills up the space between the valves in the dorsal region. Tliu-ty-two species are found living at twenty-five fathoms. It is almost cosmopolitan. P. costata is sold as food in the market of Havannah. Genus Pkoladidea. This genus resembles Pholas, but has a deep transverse furrow across the centre of its valves; the anterior gape is large, but closed in the adult by a callous plate- Seven species are found, from low tide to ten fathoms, in Britain, New Zealand, and Ecuador. Pholaduka and its sub-geuera burrow into shell, wood, resin, wax, ifec. Genus XylopJiaga. This genus bores into floating wood and timbers which are always covered by the sea. Two species are living in Norway, Britain, and South America^ Genus Teredo. Tlie shell is globose, gaping anteriorly, and behind ; the valves are trilobate, concentrica
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