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largest and most convex is pierced at the summit, and 

 supposed to be the upper valve. 



As it appears certain that it is the extremity of the 

 muscle of the animal which is attached to the opercu- 

 lum, and not a ligament connecting the operculum 

 to the larger valve, it is obvious that the Anomiae dif- 

 fer essentially from the Ostreae. Independent of this 

 muscle, there is an interior cardinal ligament which 

 fastens the valves together, the impression of which is 

 easily seen. Poli describes the animal as being organ- 

 ized very similarly to that of the Oyster. 



Anomia ephippium Anomia pyriformis 



patellaris fornicata 



cepa membranacea 



electrica squamula 



Anomia lens. 



k£ 



