TRANSACTIONS OF WAGNER 

 336 



00 TERTIARY FAUNA OF FLORIDA 



Thyassira Blainville, Diet. Sci. Nat, liv., p. 333, 1829 (err. typ.). ' 



Thyatira Jeffreys, Mai. Conch. Mag. No. 2, p. 42, 1839; Gray, Ann. Mag. Nat. Hist., xx., 



p. 272, 1847; Gray, List Brit. An., Moll., p. 99, 1851; not of Hubner, 1816 (Lepid.). 

 Thiatyra Sowerby, Conch. Man., 2d ed., p. 274, 1842. 

 Bequania (Leach MS.) Brown, 111. Conch. Gt. Brit., ist ed., pi. xvii., figs. 4, 5, 1827; 2d 



ed., p. 99, pi. xxxix., figs. 4, 5, 1844 (Tellina Hexuosa Mtg.). 

 Axinus J. Sowerby, Min. Conch., iv., p. n, 1821 (not Axina Kirby, 1817). Type A. angu- 



latus Sby., op. cit., p. n, pi. cccxv. ; Jeffr., Brit. Conch., ii., p. 245, 1863. 

 Cryptodon Turton, Dithyr. Brit., p. 121, 1822; Tellina Hexuosa Mtg. 

 Clausina Jeffreys, Ann. Mag. N. Hist., xx., p. 18, 1847 (Axinus ferruginosus Forbes) ; not 



Clausina Brown, 1827 (Chione). 

 Ptychina Philippi, Moll. Sicil., i., p. 15, 1836; ii., p. n, 1844, sole ex. P. biplicata Phil., op. 



cit., i., pi. ii., fig. 4. 

 Megaxinus Brugnone, Bull. Soc. Mai. Italiana, vi., p. 146, 1881. Type Lucina rostrata 



Pecchioli. 



Axinus Fischer, Man. Conch., p. 1098, 1887; Cossmann, Cat. 111. bas. Paris, ii., p. 29, 1887. 

 Cryptodon Smith, Challenger Lam., p. 187, 1885 ; Dall, Bull. U. S. Nat. Mus. No. 37, p. 50, 



1889; not of Conrad (Mactrid<E~), 1837; nor Cryptodonta (Nuttall MS.) Carpenter, 



Rep. Brit. Assoc., 1863, p. 525. 

 *2>Philis Fischer, Journ. de Conchyl., ix., p. 345, 1861 ; sole ex. P. Cumingi Fischer, op. cit., 



pi. xvi., figs. 8, 9. 

 Conchocele Gabb, Pal. Cal., ii., p. 27, 1866. Type C. disjuncta Gabb, op. cit., p. 28, pi. vii., 



figs. 48, a-b. 



Schisothcerus Locard, Ann. de 1'Uniy. de Lyon, p. 180, 1896; not of Conrad, 1853. 

 ~>Axinulus Verrill and Bush, Proc. U. S. Nat. Mus., xx., p. 790, 1898. Type Cryptodon 



(Axinulus) brevis V. and B., op. cit., pi. Ixxxix., figs. 7-8. 

 *>Axinodon Verrill and Bush, op. cit., p. 795. Type .A ellipticus V. and B., pi. xc., figs. 



5, 6, pi. xcii., fig. i, 1898. 



This genus has given rise to much discussion and many synonyms. The 

 earliest name is that of Leach as quoted by Lamarck, and which, in my opinion, 

 is not interfered with by the differently spelled name of Hubner. In the larger 

 species there is often a minute denticle under the beak, but Gabb mistook the 

 flat lamina upon which the resilium rests, in his Conchocele, for a tooth. The 

 remarkable anatomical characters of these animals separate them from the 

 Lucinidce. It remains to be seen how many genera can be properly grouped 

 with them from among the Lucinoid forms, of which so little is known. The 

 ligament and resilium are juxtaposed, elongated, and subequal, the' former 

 visible externally, the latter immediately below it, between the edges of the 

 valves. From the shells only one subdivision may be sectionally set off, namely, 

 Phihs Fischer, which bears to the ordinary Th\asira such a relation as Bothro- 



