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TERTIARY FAUNA OF FLORIDA 



face covered with a coarse granulation arranged in radial lines. Lon. 6.5, alt. 

 5.3, diam. 2.5 mm. The teeth are strong and the sinuation of the pallial line 

 conspicuous though shallow. 



This is the largest of the species of this division of the genus and with 

 much the most conspicuous granulation. From the recent V. (T.) ornata 

 Orbigny it is distinguished by its size and by the fact that the recent species 

 has such minute granulation that it is difficult to make it out. 



The recent species ranges on our eastern coast from Martha's Vineyard 

 south to Cape San Roque, Brazil ; on the Pacific coast it is known from the 

 Gulf of California to the Santa Barbara Islands, and it was dredged in the 

 China Seas by A. Adams. It usually has eight ribs, the two posterior ones 

 sometimes in duplicate. It has been called V . ccelata by Verrill and V. novem- 

 costata by Adams, but I have been unable to find any constant characters by 

 which the mutations might be separated. Notwithstanding its wide distribu- 

 tion, this species has not yet been recognized in the fossil state, our Pliocene 

 form being referable to V. Emmonsi. The species from the Pacific coast, 

 which is identical with Orbigny's Trigonulina ornata, was renamed Hippella 

 hippagus by Morch. His specimens came from Punta Arenas, Central 

 America. 



Superfamily ANATINACEA. 

 FAMILY LYONSIID^. 



Genus LYONSIA Turton. 

 Lyonsia Turton, Dithyra Brit., p. 34, 1822. Type Mya striata Montagu = M. norvegica 



Gmelin. 

 Magdala (Leach MS.) Brown, 111. Conch. Gt. Brit., expl. pi. xi., figs, i, 2, 10, 1827; Mya 



striata Leach, Zool. Textb., p. 464 1832; Conch. Textb., p. 142, 1833; Leach, Moll. 



Gt. Brit., p. 269, 1852. 

 Hiatella Brown, 111. Conch. Gt. Brit., expl. pi. xvi., figs. 26, 27, 1827 ; not of Zool. Textb., 



i., p. 447, 1832, nor Hiatella Daudin, 1802 (= Saxicava}. 

 Myatella Brown, Zool. Textb., i., p. 464, 1832; 111. Conch. Gt. Brit., 2d ed., p. in, pi. xl.. 



figs. 26-^27, 1844. 



Tetragonoste Deshayes, Encyc. Meth., Hi., p. 590, 1830. 

 Tetragonostea Herrmannsen, Ind. Gen. Malac., ii., p. 565, 1849. 

 Osteodesma Deshayes, An. s. Vert., vi., p. 84, 1835 (not of Deshayes, Diet. Class, d'hist. 



Nat., 1830) ; An. s. Vert, bassin de Paris, i., p. 258, 1858. 

 Pandorina Detken in Scacchi, Cat. Conch, reprint, 1857, p. 6; not of Scacchi, 1836, nor 



Bory St. Vincent, 1824. 

 Pandorina Moller, Ind. Moll. Gronl., p. 20, 1842. 



