. Bulletin of the British Museum (Natural History). Figs 109-110 Dyris ortoni (Conrad). Pebasian; Puerto Narino, Colombia; Weeda Colin. 109, GG19911; front, x 6. 110, GG19912; a, front, x 10; b, early whorls, x 25; c, oblique view of apex, x 50. Dyris ortoni (Gabb, 1869) Figs 104-112 1869 18716 1871 1871 1878 1878 1924 1926 1926 1938 1938 1966 1966 1966 1966 1969 Mesalia ortoni Gabb: 198; pi. 16, fig. 3. Isaea ortoni (Gabb) Conrad: 193 (pars); pi. 10, fig. 13 (non pi. 10, fig. 10). Odostomia ? Woodward: 103; pi. 5, figs 4a, b. Isaea (Mesalia) ortoni (Gabb); Woodward: 108. Hydrobia (I
. Bulletin of the British Museum (Natural History). Figs 109-110 Dyris ortoni (Conrad). Pebasian; Puerto Narino, Colombia; Weeda Colin. 109, GG19911; front, x 6. 110, GG19912; a, front, x 10; b, early whorls, x 25; c, oblique view of apex, x 50. Dyris ortoni (Gabb, 1869) Figs 104-112 1869 18716 1871 1871 1878 1878 1924 1926 1926 1938 1938 1966 1966 1966 1966 1969 Mesalia ortoni Gabb: 198; pi. 16, fig. 3. Isaea ortoni (Gabb) Conrad: 193 (pars); pi. 10, fig. 13 (non pi. 10, fig. 10). Odostomia ? Woodward: 103; pi. 5, figs 4a, b. Isaea (Mesalia) ortoni (Gabb); Woodward: 108. Hydrobia (Isaea) ortoni (Gabb) Boettger: 490; pi. 13, figs 8a, b,9a, b. Hydrobia (Isaea) confusa Boettger: 491; pi. 13, figs 4-7. Isaea (Mesalia) ortoni Gabb; Roxo: 49. Hydrobia (Conradia) confusa Boettger; Wenz: 1970. Hydrobia (Conradia) ortoni (Gabb); Wenz: 1971. Hydrobia (Conradia) ortoni (Gabb); de Greve: 79; pi. 1, figs 5, 6. Hydrobia (Conradia) confusa Boettger; de Greve: 80; pi. 1, figs 1-4. Hydrobia confusa Boettger; Willard: 65-68; pi. 63, figs 3, 4. Isaea ortoni (Gabb); Willard: 66-68, pi. 63, figs 1, Tryonia confusa (Boettger) Taylor: Tryonia ortoni (Gabb) Taylor: 197. Dyris ortoni (Gabb) Parodiz: 118. 197. Type material. Mesalia ortoni Gabb (1869), described from Pebas, Peru. Presumed lost, as it is not listed as present in ANSP by Richards (1968). Types of Hydrobia confusa Boettger (1878) not studied. Senckenburg Museum, Frankfurt (refigured by de Greve, 1938). Material studied. All Late Caenozoic. G25291-2, GG21631- 4, GG21717-25, about 20 specimens, Pichana, Peru, Hauxwell Colin; GG19910-5, GG21726-35, about 60 speci- mens, Puerto Narino, Colombia, Weeda Colin. G25472, Pichana, figured as Odostomia'? by Woodward (1871), 1 lauxwell Colin Further occurrences. Late Caenozoic, Pebasian; Amazon Basin. Pebas (Gabb 1869, Boettger 1878); Tres Unidos (Roxo 1924); Iquitos (de Greve 1938). Iquitos (Willard 1966: 65); Rio Marafion, 10 km above Iquitos (1966: 66); Rumi i 111 112. Figs 1
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