FAUNA OF ORTHAULAX PUGNAX ZONE. 51 



ANCILLA SHEPARDI Dall. 



Plate 7, fig. 1. 



Ancillaria sheparcU Dall, Trans. Wagner Inst, vol. 3, pt 1, p. 46, pi. 4, 

 fig. 4, 1890. 



l\uiipa silex beds at Ballast Point, Tampa Bay, Florida; Shepard, 

 Dall, Burns, and others, U. S. Nat. Mus. No. 165049. 



Family MARGINELLIDAE. 

 Genus MARGINELLA Lamarck. 



Marginella Lamarck, Prodrome, p. 75, 1799. Type, Voluta glabella Lin- 

 naeus. 



Pterygia (sp.) Bolten, Mus. Boltenianum, 1798, p. 51. 



Pterygia Link, Besclir. Rostock Samuel, 1806, p. 93. First species, Voluta 

 glabella Linnaeus. 



Voluta (sp.) Linnaeus, Gmelin, Perey, etc. 



The Pterygia of Bolten, though heterogeneous according to mod- 

 ern ideas, when the shells included in it are compared, seems to be on 

 the whole a very natural grouping if form alone be considered, 

 though we now know that the species have very different affinities. 

 He named no type and therefore we have to consider what is left 

 after various genera have been deducted from it. We may at once 

 exclude the members of the prior genera Voluta (Linnaeus) Scopoli, 

 1777, and Strombus Linnaeus, of which last an immature specimen 

 is included in Bolten's list. 



Genera subsequently eliminated in 1799 by Lamarck are: Colum- 

 hella {mercatoria) and Marginella {glabella Linnaeus), both repre- 

 sented by monotypes. The next reviser was Link, in 1806. He at- 

 tempted to reconcile the names of Bolten and Lamarck by dividing 

 the Marginellas in the wide sense into two natural groups, applying 

 Bolten's name to one and Lamarck's to the other. Unfortunately 

 instead of giving Lamarck's name to the group containing the mono- 

 type of Lamarck, he applied it to the group containing Pterygia 

 persicula Linnaeus, and used Bolten's name for the group containing 

 Bolten's first species, which is the same as Lamarck's monotype. 

 This, if accepted, would leave us no escape from regarding Mar- 

 ginella Lamarck as a synonym of Pterygia Bolten, while Marginella 

 Link, not Lamarck, would equal the later Persicula Schumacher, 

 1817. 



We may take the view, however, since Lamarck has segregated 

 Marginella {glabella) and C olwmbella {mercatoria') as representing 

 new groups from the heterogeneous Pterygia of Bolten, in which still 

 remained valid material for more than one genus, that Pterygia 

 must therefore be applied to one of the still remaining valid generic 

 groups and proceed by elimination to determine which one, as no 



