TEREDO. 181 



of Stimpson_, and (according to Fischer) T. denticulata 

 of Gray ; the young is probably Pholas Teredula of 

 Pallas^ from the coasts of Belgium. 



Among th^ species brought hither by the Gulf-stream 

 from the shores of Northern and Central America^ those 

 most commonly met with are 



T. MALLEOLUS^ Tui'tOU. 



Valves white, elongated, and tapering towards the front ; the 

 auricle is narrow and wing-like, higher than the beak, and 

 projecting from the upper part of the posterior side : pallets 

 short, with a broad blade, which in the young is transversely 

 oval, giving a mallet-shaped appearance to these appendages : 

 sheath not long, but rapidly increasing in size ; it is thin, and 

 has dehcately imbricated plates. Size of the valves nearly the 

 same as in T. Norvegica. 



Habitat : Drift wood, Guernsey (Lukis) ; Torbay 

 (Turton); Exmouth (Clark); Sussex (Dennis); Swansea 

 and Carmarthen bays (J. G. J.); Milto^vn-Malbay 

 (Harvey); Belfast (Thompson); youngs in cork, Ply- 

 mouth (Webster); Falmouth (Norman): Cailliaud 

 found it also in drift wood at Croisic, Loire- Inferieure. 

 Specimens sent to me by Dr. Philip Carpenter for exa- 

 mination came from St. Vincents. I therefore infer 

 that the West Indies (and not Sumatra, as stated by 

 Forbes and Hanley) is its native place. 



The valves (but not the pallets) of T. bipinnata, Turton, 

 apparently belong to the present species. As more 

 than one kind of Teredo often inhabit the same piece of 

 wood, mistakes are liable to be made in extracting the 

 valves and pallets ; such may account in a great measure 

 for the confusion that exists in public and private collec- 

 tions, and which has found its way into systematic 

 works. A specimen in the British Museum, named 



