The figures are of natural size unless the amount of enlargement or reduction is stated. 



PLATE I. 



(J runs — Lima, Bruguiere. 



Lima canalifera, Goldfuss. Upper Greensand (zone of Pecten asper), Ventnor 

 Sedgwick Museum, Cambridge ; except fig. 2, York Museum. (P. ] .) 



1, 5, 6 a, 7 a, left valves ; 6 b, antero-dorsal view ; 7 b, portion x 2. 



2, 3, 4, right valves. 



