TEREDO. 83 



scarcely wider than the atalk, is closely articulated ; the 

 upper and concave edge of each joint terminating at either 

 extremity in an ascending filament, is adorned on one 

 side with a very fine fringe of similar, but more minute 

 filaments. The joints towards the extremity appear in the 

 few specimens we have seen, to lose their lateral filament, 

 and the concavity of the upper edges so increases as to 

 form a decided angle near their middle. 



The tube, which we have not seen ourselves, is declared 

 by Dr. Turton to be thicker and stronger than that of 

 Norvagica, and simple at its outer orifice ; and by Mr. 

 Gray, in the Annals of Philosophy for ] 827, to be not 

 concamerated. The diameter of the valves from whence 

 our description was drawn up, is about four-sevenths of an 

 inch, whilst the pallets are actually three inches in length, 

 and about two lines broad at the widest part. These di- 

 mensions, however, especially that of the pallet, are greatly 

 exceeded in the Sumatran examples, from whence we may 

 reasonably conclude that that country is in all probability 

 its native habitat. Specimens are extremely rare ; those of 

 Dr. Turton, are I'ecorded by him to have been taken from 

 a piece of fir timber, which, covered with Anatifa lavis, 

 had been drifted into the river Ex. Mr, IJean writes us 

 word that he has met with it on the coast of Scarborough ; 

 and Mr. Thompson informs us that he has only acquired 

 his from wood washed upon shore at Youghal, and at Mil- 

 town Malbay in Clare, at the former of which places it was 

 found by Mr. R. Ball, and at the latter by Mr. Harvey. 

 Valves marked " Waterford" are likewise to be seen in a 

 collection formed by Mr. Humphreys, of Cork, and now in 

 the possession of Mr. Jeffreys. The British Museum, and 

 the extensive collection of Mr. Metcalfe, equally include it ; 

 the specimens of the former were taken by Mr. Bulwer 



