554 



TECTINIDyE. 



Genus VOL A, Klein. 



Shell sub -orbicular, inequivalve, closed, the upper valve 

 flattened; surface of valves radiately ribbed; auricles nearly 

 equal. Hinge-line straight ; ligament marginal, narrow ; 

 cartilage pit central. Muscular impression large, sub-central ; 

 pallial line simple. 



Syn. Pandora, Milhlf., not Soland. Janira, Schum. 



Ex. V. Jacobaea, Li/maws, pi. 127, fig. 2. Shell, V. 

 maxima, Linnams, fig. 2, a, 2, h. 



The species of Vola are not very numerous, but are 

 "widely dispersed. The chief character by which the shell 

 can be distinguished is the flatness of the upper valve. 



Species of Vola. 



aspera, Soiv. 

 dentata, Sow. 

 Erythraensis, Sow. 

 filosa, Reeve. 

 fiorida, Hinds. 

 furnata, Reeve. 

 fusca, Klein. 

 histrionica, Gmel. 

 Idaeus, Reeve. 

 inequivalvis, Sow. 

 Jacobaea, Linn. 

 laqueata, Sotv. 

 maxima, Linn. 



media, Lam. 

 modesta, Reeve. 

 Novae Zelandio3, Ret re. 

 pulchella, Reeve. 

 pyxidata, Bom. 

 sericeus, Hinds. 

 similis, Sow. 

 Sinensis, Soiv. 

 spectabilis, Reeve. 

 subviridis, Soiv. 

 sulcicostata, Sow. 

 unicolor, Lam. 

 zic-zac, Linn. 



Genus AMUSSIUM, Klein. 



Shell orbicular, sub-equivalve, thin, gaping at the sides ; 

 surface of valves smooth ; auricles sub-equal, the right 



