170 Trans. Acad. Sci. of St. Louis. 



at least occasionally, finely plicate within throughout its length . 

 The species described by Dr. Dall from the Florida Pliocene 

 under the name pygmaea, will probably form a genus or sub- 

 genus different from the purely lyrate species including 

 cincta Dall from the same beds, as well as lirata Ad., as- 

 sumed as the type of Mitromorpha. This genus has recently 

 been assigned to the Mitridae by Dall (Trans. Wag. Inst., 

 Vol. 3, p. 95). 



Issued May 19, 1904. 



