TRANSACTIONS OF WAGNER 



TERTIARY FAUNA OF FLORIDA 



>Milthea Meek, Inv. Fos. Up. Missouri, p. 131, 1876 (err. typ.). 



^Miltha Cossmann,'Cat. Illustr., ii., p. 30, 1887; Fischer, Man. de Conchyl., p. 1143, 1887. 



^Pseudpmiltha Fischer, Man. de Conchyl., p. 1144, 1887. Type Lucina gigantea Deshayes, 



Coq. Fos. env. de Paris, i., p. 91, pi. xv., figs, n, 12, 1824. 

 ^.Triodonta Gray, List Brit. An., p. 97, 1851; not of (Schumacher, 1817, em.) Agassiz, 



Nomenclator, p. 1087, 1848. 

 fAustriella Tenison Woods, Trans. Roy. Soc. Victoria, Melbourne, xvii., p. 82 (A. sor- 



dida), 1881; Tryon, Syst. Conch., Hi., p. 211, 1884. 



Gabb, Pal. Cal., ii., pt. i., p. 29, 1866; pt. ii., p. 100, 1869. Type Lucina Richt- 



hofeni Gabb, loc. cit., pi. viii., fig. 49. 



de Gregorio, Bull. Soc. Malac. Ital., x., p. 217, 1885. Type Lucina columbella 



Lamarck. 

 *^>Cavilucina Fischer, Man. de Conchyl., p. 1143, 1887. Type Lucina sulcata Lam.; Coss- 



mann, Cat. Illustr., ii., p. 35, 1887. 



^.Dentilucina Fischer, Man. de Conchyl., p. 1143, 1887. Type Lucina jamaicensis La- 

 marck; Cossmann, Cat. Illust, ii., p. 36, 1887. 

 ^>Cardiolucina Sacco, Terz. Piem. Lig., xxix., p. 89, 1901 (Lucina Agassisi Mich.). 



This genus comprises most of the shells formerly included in the genus 

 Lucina in a wide sense. Owing to the numerous modifications and combina- 

 tions which it exhibits, it is necessary for clearness to recognize a number of 

 subdivisions. In Leach's " Mollusca of Great Britain" he states that he had 

 proposed to call the shells denominated Lucina by Lamarck by the name of 

 Egraca, but, not having published this name, he adopts that of Lamarck. I 

 have, therefore, as no type was mentioned, regarded Leach's Egraca (1852) 

 as an exact synonym of Lucina Lamarck senso lato. 



Tridonta Schumacher was founded on Astarte borealis, but owing to a 

 confusion between the Venus (Astarte) borealis of Chemnitz and the Venus 

 (Lucina) borealis of Linnaeus the name has crept into the Lucinoid synonymy. 



A curious brackish-water shell from Australia was imperfectly described 

 and obscurely figured by Tenison Woods in 1881 under the name of Austriella. 

 He referred it to the Unionida, but from the appearance of the figure Tryon 

 supposed it might be Lucinoid. More information is needed before its place 

 can be definitely ascertained. 



The following subdivisions of the genus seem warranted by the shell char- 

 acters : 



Subgenus Phacoides Blainville s. s. Type Lucina jamaicensis Lamarck. 



Shell lentiform, with strong dorsal areas and chiefly concentric sculpture, 

 the cardinal teeth obsolete in the adult but the laterals well developed. 



