. Bulletin of the British Museum (Natural History). PEBASIAN MOLLUSCAN FAUNAS 191. â Figs 59-65 Dyris tricarinata (Boettger). Pebasian; Pichana, Peru; Hauxwell Colin. 59, shell figured by Conrad (18716: pi. 10, fig. 10) as Isaea ortoni (Gabb), NYSM 9253; front view, x 10. 60, GG21692; rear, x 25. 61, GG21693; front, x 20. 62, GG21690; rear, x 20. 63, G25289; front, x 15; see also Fig. 66. 64, GG21691; front, x 20. 65, G25290; front, x 15. 1966 Hydrobia tricarinata Boettger; Willard: 65; pi. 62, figs 4-6. 1966 Tryonia tricarinata (Boettger) Taylor: 197. 1969 Dyris gracilis Conrad; Par
. Bulletin of the British Museum (Natural History). PEBASIAN MOLLUSCAN FAUNAS 191. â Figs 59-65 Dyris tricarinata (Boettger). Pebasian; Pichana, Peru; Hauxwell Colin. 59, shell figured by Conrad (18716: pi. 10, fig. 10) as Isaea ortoni (Gabb), NYSM 9253; front view, x 10. 60, GG21692; rear, x 25. 61, GG21693; front, x 20. 62, GG21690; rear, x 20. 63, G25289; front, x 15; see also Fig. 66. 64, GG21691; front, x 20. 65, G25290; front, x 15. 1966 Hydrobia tricarinata Boettger; Willard: 65; pi. 62, figs 4-6. 1966 Tryonia tricarinata (Boettger) Taylor: 197. 1969 Dyris gracilis Conrad; Parodiz: 118 {pars). 1980 Hydrobia tricarinata Boettger; Costa: 878; pi. 1, figs 5, 6. v. 1982 Dyris cf. gracilis 'form' carinata (Boettger); Bristow & Parodiz: 16, 41. TYPE material. Types of Hydrobia tricarinata Boettger not studied. Senckenburg Museum, Frankfurt. One of Boettgcr's speeimens (1878: pi. 13, fig. 11), was designated by de Greve (1938) as 'Typus' (= Lectotype) and another (1878: pi. 10, fig. 10) as Paratype. Both Late Cacnozoic, Pebasian; Pebas, Peru. Material studied. Late Cacnozoic, Pebasian: G25289-90, GG21686-8, GG21689/1-30, Pichana, Peru (Hauxwell Colin); GG21690-4, GG21695/1-20, Pichana, Peru (Hauxwell Colin, extracted 1982); NYSM 9253, six shells, including the shell figured by Conrad (1871: pi. 10, tig. 10), Pichana. Peru (Hauxwell Colin); GG21527-9, Puerto Narino, Colombia (Weeda Colin). Late Caenozoic: GG19840-9, GG19958, km upstream from La Tagua, Colombia (Weeda Colin); GG19936, Loc. 33, 480-560 cm, La Tagua (Eden Colin); GG19929-32, Loc. 54, La Tagua (Eden Colin). ? Upper Miocene (Bristow & Parodiz, 1982: 17), San Cayetano Formation, Loja Basin, Ecuador: GG19809, GG21706-15, Loc. JW 424, Grid ref. 008 582 (Bristow & Parodiz, 1982: 16, 41). G43325-6, Loja (Prof C. Carrion Colin. 1926) are in similar matrix and are probably from the same horizon. Further occurrences. Late Caenozoic. Pebasian: Pebas (Boettger 1878, de Greve 1938); CPCAN
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