20 



PRODUCTUS personatus. 



TAB. CCCXXI. 



Spec. Char. Hemispherical, irregularly stri- 

 ated, beneath very concave ; within the 

 larger valve are three deep cavities, one 

 connected with the beak, and two remote. 



X ROM the impressions of tlie cavities, which become 

 protuberances, the cast of the larger valve has the ap- 

 j)earance of a bird's head ; the remote ones are not very 

 prominent, but are large ; that about the beak is divided 

 into three lobes, of which the lateral ones are striated, 

 and the central one is connected with the remote protu- 

 berances by a ridge. The surface was probably covered 

 with small spines, but this is not well ascertained. 



Such is the resemblance of this shell to a face, that 

 the name personatus was thought apposite ; when less 

 completely deprived of the shell than the specimen 

 figured, there remain numerous small elevations which 

 are probably the bases of spines, these have been taken 

 for the roots of feathers, and so strong a resemblance was 

 then found to an owl's head, that the owner of a large 

 specimen, which he brought to shew me, would hardly be 

 persuaded that it coiihl he any tiling else. This speci- 

 men was found in Derbyshire : the figure is taken from 

 one picked up near Kendal. 



