TRANSACTIONS OF WAGNER 

 668 



TERTIARY FAUNA OF FLORIDA 



Several species of Perna occur in the literature which do not belong to 

 the genus as here understood, but to Modiolns. The only other species of 

 Melina reported from our Tertiary are the unfigured M. montana Conr. (Pac. 

 R. R. Reps., vii., p. 195, 1857), from San Buenaventura, California, 'of which 

 nothing seems to have been seen since it was described by Conrad, and the 

 Perna cornclliana Harris, from the Midway stage of Alabama, near Clayton. 

 The remains of this species are quite imperfect, and it is not practicable to 

 make comparisons with M. maxillata. 



FAMILY PTERIID/E. 

 Genus PTEBIA Scopoli. 



I'ti-fia Scopoli, Intr. ad Hist. Nat., p. 397, 1777 ; (sole ex. Mytilns Iiirunilo L.) 



Avicula Olivi, Zool. Adriat., p. 125, 1792. 



Margaritifera Humphrey (/-.r part,-'), Mus. Calon., p. 44, 1797 (iipud Da Costa, 1776, 



non binom.). 



riiiflitila Boltcn, Mus. Boltenianum, p. 167, 1798. 

 Avicula Lam., Prodr., p. 82, 1799. 

 ('niiiitm Link, Beschr. Rostock Sainml., p. 155, 1807. 

 Margaritiphora Meg. v. Muhlf. , KnUv., p. 66, 1811. 



Lam., Kxtr. d'un Cours, p. 104, 1812 ; An. s. Vert., vi., I, p. 150, 1819. 

 Leach, Zool. Misc., i., p. 107. 1814; S\vainson, Zool. 111., 2cl Ser. , ii., pi. 55, 



1831 ; not of Leach, 1819, or of Lea, 1838. 

 /' rfiiinati-r Schum., Kssai, p. 107, -\- Avicula, p. 136, 1817. 

 Anonica Oken, Handb. d. Zool., 1815 ; Naturg. fiir Schulen, p. 652, 1821. 



The present group was called Margaritifera by J. Woodward in 1728, a 

 name long antedating Klein's Avicula, but not introduced into binomial no- 

 menclature until after the publication of Plena by Scopoli. The Tertiary and 

 recent forms include the following subgenera : 



Pteria s. s. Type Mytilus hirundo Linne. 



Margaritifera Humphrey. Type M. inargariferus Linne. 



Eleetroma Stolic/ka. Type Avicula smaragdina Reeve. 



Of these the latter may be represented in the recent fauna of the Antilles 

 by Avicula Candcaiia Orb., which seems to owe its characters to commensalism 

 with sponges ; Margaritifera is represented by the Antillean pearl-oyster, 

 M. radiata Leach, but, curiously enough, neither is known as an American 

 Tertiary fossil. 



Of typical Pteria there are but few in our Tertiary, and these are often 



