JAMES 



F.G.S., F.L.S., &c. 



IOSSIL GASTEBOPODA are now familiar to the worker 

 in the Inferior Oolite from the fine specimens of these 

 usually-called Univalve shells recently obtained from 

 Bradford Abbas, Half Way House, Coker, and other localities 

 both in Dorset and Somerset. 



Like most of the recent examples of Univalves, the fossil shells 

 are generally dextral or right handed; but we have now the 

 pleasure of introducing to the notice of our Field Club a fine 

 series of sinistral shells of this class. 



Both recent and fossil examples of sinistral shells occur, but 

 they are not common, neither abounding in species nor specimens. 

 Five doubtful species are introduced from the Inferior Oolite 

 of Dorset and Somerset, which are cited as follows : 

 1. Cirrus Leachi, Sow., M. C., t. 219, f. 3. 



nodosus, Sow., M. C., t. 219, f. 2-4. 

 intermedius, Buck., see plate, f. 4. 

 , pyramaidalis, Tawney. 



calisto, JfOrlig, Ter., Jur., pi. 332, f. 10. 

 These specimens, presently to be described, have been figured 

 as well as their imperfect condition will allow, and we may here 



