TEREDO. 179 



has been taken at Plymouth by Mr. Webster, at Fal- 

 mouth by Mr. Norman, in Swansea and Carmarthen 

 Bays by myself, and at Aberdeen by Professor Macgil- 

 livray. This last variety was described by me as T. 

 subericola in the ' Annals and Magazine of Natural 

 History ' for August 1860, under the impression that it 

 was a distinct species. The typical form and first two 

 varieties were detected by Mr. Hyndman in pieces of 

 drift wood, that were dug up in making a public sewer 

 at Belfast thus showing the existence, at a period 

 antecedent to our own, of oceanic currents and other 

 conditions similar to those which still prevail. Malm 

 discovered a valve in the Uddevalla deposits. This 

 species is widely distributed over the North Atlantic. 

 Torell found it on the west coast of Spitzbergen in drift 

 fir wood of two kinds, one from Norway or Siberia, and 

 the other probably from Canada ; Fabricius has recorded 

 it from Greenland, Mohr from Iceland (spoiling 

 valuable pieces of drift timber) , and Miiller from Norway 

 and Denmark; Lilljeborg found it at Mangesund, 

 Upper Norway, in the timbers of a sunken vessel, and 

 also at Bergen; Deyenburg at Lysekihl, Bohuslan 

 (about 12 Swedish miles north of Gottenburg), with 

 T. Norvegica and T. navalis; D'Orbigny (pere) at 

 Rochelle, Cailliaud at Croisic, and M' Andrew (var. 

 mionota) in the North Atlantic, in floating timber ; 

 Stimpson has described it (under the name of T. dilatata) 

 as infesting harbour buoys and fixed woodwork at Lynn, 

 New England; and Tryon states that the range of this 

 species extends from Massachusetts to South Carolina. 

 The last-named locality affords some clue to a fact 

 which puzzled me not a little, viz. the occurrence in 

 drift wood of T. malleolus (a native of the West Indies) 

 together with the present species, which I received 



