. Bulletins of American paleontology. 322 Bulletin 180 The two genera, VentricoUdea and Antigona, have strong concentric ribs (radial ribs do not exist in all species of Antigona), interior crenula- tions of the palhal margin, definite lunule and corselet, the same hinge with three divergent teeth and one lateral anterior All of the left valve, the same short and pointed pallial sinus. But Glibert (194 5, p. 186), as well as Frizzell (1936, p. 57), indi- cated that VoUyicoHdea equals Dos/na Gray, 1831, of which the type species is D. zelandica Gray (Powell, 19-46, p. 15, fig. 3). In comparing
. Bulletins of American paleontology. 322 Bulletin 180 The two genera, VentricoUdea and Antigona, have strong concentric ribs (radial ribs do not exist in all species of Antigona), interior crenula- tions of the palhal margin, definite lunule and corselet, the same hinge with three divergent teeth and one lateral anterior All of the left valve, the same short and pointed pallial sinus. But Glibert (194 5, p. 186), as well as Frizzell (1936, p. 57), indi- cated that VoUyicoHdea equals Dos/na Gray, 1831, of which the type species is D. zelandica Gray (Powell, 19-46, p. 15, fig. 3). In comparing V. ninlt/lainella Lk. of Italy (Coll. Nat. Mus. Wash, no. 20316) and Dos/na zela)ulica (in Marwick, 1925-27, pi. 44, figs. 118, 119, 121) (Powell, 1946, pi. 15, fig. 3), I note that the two species belong to the same genus called Dos/na by priority. But is Dos/na equivalent to Ant/gona? Almost all authors separate them into two different genera or different subgenera, except Thiele (1931) who made Dos/na the synonym of 7^. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]
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