26o C O N C H O L O G Y. 



twifcings of Ribbands, vulgarly called True 

 Lovers Knots. This is the fecond fort men- 

 tioned by Daviia. PI. VI. fig. 5. The 

 other ftrufture, which is Davila's third fort, 

 is a guttered triangular appendage, with a 

 cut or fent half-way down it, fixed per- 

 pendicularly on the upper valve, from the 

 top or beak, to the middle of the Shell. 



I have been very prolix on the Anomiae, 

 in order to eftablifli what characters I could 

 to form, if pofTible, a proper definition 

 ' of this curious genus of Shells. 



A very furprizing and unaccountable 

 circumftance, relative to the foffil and re- 

 cent teftaceous animals, which has been 

 already noted, is, that all thofe found in 

 immenfe quantities in the foffil ftate, arc 

 hardly known recent, and vice verfa, I 

 inftanced It in the Ammonia, that are 

 found in incredible quantities foftil all over 

 the world, though none are yet difcovered 

 recent; and this family of Anomiae, though 

 alfo found foffil in an a(l:oni(hing abun- 

 dance 



