208 CO^CHYLlX—niTHYRA. 46. 



Shell inequivalve, the upper valve flat witli a depression near tlie 

 hinge, the rays angular and in the under valve longitudinally 

 grooved. 

 Ostrea Jacobaea. Linn. Syst. Nat. p. 1 144. 



Gmelin, Syst. p. 3316. 



Turton, Linn. Syst. iv, p. 258. 



Donovan, British Shells, iv. tab. 137. 



Linn. Trans, viii. p. 97. 



Dorset Catal. p. 37, tab. 13, fig. 2. 



Dillwyn, Descript. Catal. p. 248. 



Tnrlon, Conch. Diet. p. 128. 

 Pecten Jacobaeus, Pennant, iv. p. 5^20, tab. 63, fig. 1. 



Da Costa, Brit. Conch, p. 143. 



Montagu, Test. Brit. p. 144. 



Turton, British Fauna, p. 161. 

 Pecten Jacobi. Chemnilx, vii. p. 273, tab. 60, (ig. 588, 589. 

 Pecten magnus. Lister, Conch, tab. 155, 156, fig. 2, 3. 

 Supposed to have been found in Dorsetshire. 



Shell about three inches in diameter, of a rufous brown color, 

 with the under valve white and very concave, where the ribs are 

 more flattened and angular. 



This shell has its specific name from the circumstance of its 

 being worn on the cap or shoulder of votaries, in evidence of their 

 liaving performed a pilgrimage of adoration to the shrine of Saint 

 James, in the city of Compostella, or Saint lago, in Spain, where 

 his relicts are preserved. 



The authors who speak of this shell as not very uncommon on 

 the Dorsetshire, Cornish, and Yorkshire coasts, have mistaken for 

 it, as we suspect, some of the varieties of the Pecten maximus 



