60 
room viii. bis fimbriata, Lucina pensylvanica,—several spe- 
Nat. Hist cies of the genus Donax, and the genera Capsa 
and Crassina. Under the families of the Conchas, 
are Cyclas, Cyrena, and the very rare shell Gala- 
taea radiata, (Venus subviridis. Gmel.) Cyprina 
and part of the genus Cytherasa. 
(Table 8.) Cytheraeas, and part of the 
Veneres ; containing several species of each ge¬ 
nus. 
(Table 9.) The remainder of the genus 
Venus, and the genus Venericardia, of which 
very few species are known, except in the fossil 
state. The family of the Cardiacea, are also in¬ 
cluded in this compartment, namely the genera 
Cardium, Cardita, Cypricardia, (the two last 
were classed by Linneus with the Chama) Hia- 
tella, (Mya of Linneus) and Isocardia. The last 
genus includes the rare and elegant shell Isocar¬ 
dia Moltktiana—theChama Moltktiana ofGmelin. 
(Table 10.) The families Arcacea, Tri- 
goniana, and part of the Nayada. Amongst 
them are the Cucullaea auriculifera, (Area cu- 
cullus. Gmel. ) several species of the genera Ar¬ 
ea and Pectunculus, and the genus Nucula ; (the 
two latter were confounded with the Areas, by 
Linneus,) the genus Trigonia, and part of the 
genus Unio, (Mya of Lin.) some species of 
which furnish pearls of considerable size and 
beauty. 
(Table 11.) Unio continued; and the 
genera Hyria, Anadonta, (Mytilus. Lin.) and a 
single 
