212 CO^CHYLlk—DlTHYRA. 46. 



Shell about three quarters of an inch in diameter, yellow 

 mottled with rufous brown, and marked on the inside with nu- 

 merous slender rays. 



We suspect that this is one of the endless varieties of the 

 Pecten obsoletus, with the auricles more equal than are generally 

 observed among our English specimens ; and that the Pecten 

 glaber of Linne, as figured in plate 67 of Chemnitz, and our 

 Pecten obsoletus are one and the same species. 



tumidus. Pecten iestd ^eqmvalvi inceguilaterali glaberrimd, latere altero 

 producto. 

 Shell equivalve inequilateral quite smooth, with one of the sides 

 produced. 



Tab. nost. 17, fig. 3. 

 Ostrea tumida. Turton, Conch. Diet. p. 132. 

 Mus. nost. Taken from the Serpula tubularia, in Torbay. 



Shell a quarter of an inch in diameter, orbicular, glossy white, 

 transparent, and without striae ribs or marks of any kind : the 

 sides not equal, in consequence of one of them being prominent 

 in a rounded manner : ears very nearly equal. 



## auricuUs inrequalibus. 8-12. 

 with the ears unequal. 



laevis. Pecten tcstd (squwalvi eequilaterali, planiusculd, semipellucidd , 

 glaberrimd. 

 Shell equivalve equilateral, flattish, semitransparent and quit« 

 smooth. 



