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s boring disk cavities ; and they are found in moulds as. enadly fitted to their bodies, as thofe are to melted matter call into them by a founder. ft may,

however, be fuppoled that the Ilone and wood don adually give way to the growth of the animal within, beeaufe the fads are well attelled ; but how this comes to pals, in their Pholades and cylindrical Mukles, and

by what means, toads, &c. can receive &haunt to cane their growth, without any external communication, mull yet remain among thofe ferrets of nature, which we cannot but admire, without knowing how they are brought about.

Explanation of the Tabte. Fig. I. Is a view of thc furface of one of the great valves, with the edges of the two longitudinal pieces. and with portions of the (month parts at the round extremity or bale.

Shews the anteriour edge of the Pbolas covered by the long fmooth white piece, and,

at the bale, having part of the (moth portions of the great valves in vkw. III. Reprefents the polleriour edge of the Pholas, with the round white piece upon the bale

end, and the long ditto, which is larger than that of the fore edge, running towards thc apex.

IV. In

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by what means, toads, &c. can receive &haunt to cane their growth, without any external commu- nication, mull yet remain among thofe...

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