ANOMIA. 109 



position, would do well if they could imitate him by doing 



as little mischief and as much good. 



IV. Anomia. — The attachment of the AnomicB is by means 

 of a kind of button fixed to the object, and locking 

 through a hole in the lower or flat valve. The shells 

 are very irregular, some of them very bright and pearly 

 within ; they are remarkably apt to take their form and 

 sculpture from that of the objects to which they are 

 fixed. 



A. ejjJiijjjnum is the common species, so variable in its form 

 and sculpture as to have received, in its various con- 

 ditions, the names electrica, squamula, cejm, fiexuosa, 

 cylindracea, jMtellafomiis, etc. 



A. striata : regularly and minutely striated. 



A. patellaformis, with a cavity on the under valve, beneath 

 the hinge. 



A. aculeata, with radiating prickles. 



