13 



ASTARTE roi^atos. 



TAB. CCCXYI. 



Spec. Char. Obovate, anteriorly siibtnmcated, 

 when young' transversely costated, after- 

 wards slightly wrinkled ; edge internally 

 erenidated ; lunette concave, obovate, 

 pointed. 



j\. RATHER gibbose shell, with a regularly concave 

 short lunette ; the costce extend only a little beyond the 

 beaks, and are often entirely lost by erosion, although 

 the animal probably inhabited ancient seas, if we may 

 judge from its analogy to A. Scotica, Danmoniensis, 

 &c. to the latter it bears so strong a resemblance that 

 it might easily be taken for it, were it not more gibbose 

 and smoother, or rather, not regularly costated. Fig. 1 

 represents a young individual, the edge of which is not 

 crenated, neither are there any crenulations upon the 

 edges of those given at figures 2 and 3, but as they are 

 chipped all round, it is possible that they may have 

 been crenulated when perfect : the entire edge is the 

 only character that distinguishes A. Scotica from Dan- 

 moniensis : I have doubts respecting its sufficiency, and 

 in the present case am not inclined to admit the young 

 shell with an entire edge to the rank of a species, since 

 it exactly agrees Avith the marks upon the umbones of 

 the larger shells. 



Found at Highgate when the Archway was digging 

 through the hill. 



