. Bulletin of the British Museum (Natural History). . C. P. NUTTALL Figs 454—455 Dyris gracilis Conrad. Pebasian; Canama, Peru; Barrington Brown Colin. Front views, x 20. 454, GG22416; lectotype (herein selected) of Melania bicarinata Etheridge (1879), originally figured by Etheridge (1879: pi. 7, fig. 7). 455, GG22421; holotype of Melania tricarinata Etheridge (1879), originally figured by Etheridge (1879: pi. 7, fig. 6). Fig. 456 (Etheridge). Pebasian; Canama, Peru; Barrington Brown Colin. GG22419; lectotype (herein selected) of Melania scalarioides Etheridge (18
. Bulletin of the British Museum (Natural History). . C. P. NUTTALL Figs 454—455 Dyris gracilis Conrad. Pebasian; Canama, Peru; Barrington Brown Colin. Front views, x 20. 454, GG22416; lectotype (herein selected) of Melania bicarinata Etheridge (1879), originally figured by Etheridge (1879: pi. 7, fig. 7). 455, GG22421; holotype of Melania tricarinata Etheridge (1879), originally figured by Etheridge (1879: pi. 7, fig. 6). Fig. 456 (Etheridge). Pebasian; Canama, Peru; Barrington Brown Colin. GG22419; lectotype (herein selected) of Melania scalarioides Etheridge (1879), originally figured by Etheridge (1879: pi. 7, fig. 8). Front view, x 20. (See also Fig. 139, p. 206). southward extension of the basin towards Rio de la Plata, blocked further south by a drainage divide. The eastern limit of the Pebasian Basin seems to be marked fairly closely by the long-known classic localities. So far, the most easterly Pebasian fossils known are those described from the neighbourhood of Sao Paulo da Oliven^a (Costa 1980). Brazilian geologists have mapped both the Pebasian deposits themselves and also apparently later beds stretching as far east as Manaus and encompassing deposits of the Rio Jurua as Solimoes Formation. This problem is discussed in more detail in the section on Brazil. It is concluded, however, that they are not an extension of the Pebasian Basin and, where fossiliferous, contain different and younger faunas. No Tertiary non-marine molluscan fossils have been named from the Oriente of Ecuador, though their presence was noted (Campbell 1970: 20, Tschopp 1953: 2338). The discus- sion on the Cuenca Basin deposits elsewhere in this work show that its molluscan faunas have far less in common with the Pebasian than formerly suggested (Bristow & Parodiz 1982). The presence of both Liris and Longiverena eucosmia suggest some connection. The Cuenca Basin is here regarded as part of the same general depositional area as the Pebasian. Differ
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