TRANSACTIONS OF WAGNER 

 1360 



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. 



'^Pseudomiltha Fischer, Man. de Conchyl., p. 1144, 1887. Type Lticina gigantea Deshayes, 

 Coq. Fos. env. de Paris, i., p. 91, pi. xv., figs. 11, 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., iii., p. 211, 1884. 



'^Here 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. 



"^Linga 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. lUust., ii., p. 36, 1887. 



'^Cardiolucina Sacco, Terz. Piem. Lig., xxix., p. 89, 1901 {Lucina Agassizi Mich.). 



This genus comprises most of the sliells 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 Lticina 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 lata. 



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 byTenison Woods in 1881 under the name of Austriella. 

 He referred" it to the Unionidce, 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 Lticina jamaicensis Lamarck. 



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

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



