



PLATE \I. 



i\.. r . 



n'oci-i: \Mi". ii:\<;nr; H.X M J> 



Figi I . Right valve uf 0116 of Whitfield's types <>r Tnooet'dntut porplexui, 

 NmI, Mhh. Oat. tnvert. Pom., L2274, 

 2. A Larger right valve (after Meek). 



8,4. Two views of one of the types ol FitoosrafniMi howelU (after White). 

 i». a large example selected from the types of Tthowtlli to show varl 



.ilioil III loini. 



Nat, Mus. Cat, [nvert, Foil.; W52. 

 211 



