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 dirata 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, 7904. 
