XXIV 



THE CLASS OF ACEPHALA OR ACEPHALS. 



ORDERS. Families. Genera. 





K 

 o 



< 



pa 

 13 



< 



<1 

 H 



E 

 o 



< 



2 

 13 





08TKEID.K or 



Oystek Family. 



Ostrea, (fc. 

 Ptcterij t^c. 



or Oysters. 



" Pectens or Scallops. 



AVICULID.E or 



Peakl-Oyster 



Family. 



MytxhD/E or 



Sea-Mussel 

 Family. 



Arcade. 



Teigohid^ or 

 Teigonia 

 Family. 



Unionid^ or 



POMD & KlVEK 



Mussel Family. 



Chamid^;. 



TKIDACNIDiE or 



Tridacna 

 Family. 



Cardiad^ or 

 Cockle Family 



LuCINID^. 



Cycladid^. 



CYPEINXD.E. 



Veneris .E or 



Venus-Shell 



Family. 



Avicida^ ^c. 



or Pearl-Oysters, &c. 



Mylilus, ^c. or Sea-Mussels. 



Area 



Trigonia^ ^c. 



Unio 

 Anodon, ^c. 



Chama, ^-c. 



Tridacna 

 Hij}popzi3 



Cardia, ^c. 



Lvdna^ ^c. 



Cyclas, ^c 



Cyprina 

 Astartej <fc. 



Venus 

 Cytlterea, <fc. 



