IO2 R. BULLEN NEWTON on 



dorso-posterior side is a widely elongate, thick, calcareous plate which would 

 represent the attachment surface of the posterior adductor muscle. Unfortu- 

 nately, the ventral margin of the valves available for examination is not 

 sufficiently preserved to show the parietal tubercle, so important a structure in 

 Teredo. Without, therefore, attempting to refer these remains to any individual 

 species, it may be stated that they somewhat resemble such forms as Teredo 

 libyca 1 from the older Eocene of Egypt, T. tournali of Leymerie 2 from the 

 Eocene of France and Egypt, as also T. cincta and T. vermicularis, both of 

 Deshayes 3 , from the Parisian Eocene. The tube characters are, also, very 

 similar to those prevailing in the well known Teredina personata from the 

 older Eocenes of Britain and France, although the Nigerian valves show no 

 indication of a callosity plate covering the great gape in front, which is among 

 the distinguishing features of Teredina. 



DIMENSIONS of a left valve : 



Height 7 millimetres. 



Length ... ... 7 



Diameter ... ... ... ... ... 3 ,, 



Associated with these Teredo tubes is a small, narrow, cylindrical shell 

 referred to Coralliophaga eocenica sp. nov. (see p. 99) and some cast-remains 

 of a small Xenophoroid shell previously described as Tugurium nigeriense 

 sp. nov. 



OCCURRENCE. No particular cutting referred to. In ironstone nodules 

 weathering a grayish colour externally. 



COLLECTORS. Sir J. Eaglesome and Sir F. Lugard. 



1 Oppenheim : Palaeontographica, 1906, Vol. 30, part 3, pi. 27, fig. 16, and. Text-figures, p. 207. 



2 Mem. Soc. Geol., France, 1846, Ser. 2, Vol. i, pi. 14, figs. 1-4, p. 360, and Palaeontographica 1006 

 Vol. 30, part 3, p. 207. 



3 Suppl. Desc. Coq. Foss., Paris, 1857, Vol. i, pi. 3, figs. 5-9, pp. 115-117. 



