. Bulletin of the British Museum (Natural History). 190 C. P. NUTTALL whilst his pi. 5, figs 30 and 37 are now assigned to D. hauxwelli sp. nov. (see p. 192). The distinctions between D. gracilis and D. hauxwelli are given under the latter. D. tricarinata (Boettger) may be easily separated from D. gracilis by its larger apical whorls, greater spire angle and different whorl profile. Dyrislintea (Conrad, 1871) Figs 49-58 *v 1871 Isaea lintea Conrad: 193; pi. 10, fig. 6. 1878 Hydrobia (Isaea) lintea (Conrad) Boettger: 493. 1924 Isaea lintea Conrad; Roxo: 49. 1926 Hydrobia (Conradia) li
. Bulletin of the British Museum (Natural History). 190 C. P. NUTTALL whilst his pi. 5, figs 30 and 37 are now assigned to D. hauxwelli sp. nov. (see p. 192). The distinctions between D. gracilis and D. hauxwelli are given under the latter. D. tricarinata (Boettger) may be easily separated from D. gracilis by its larger apical whorls, greater spire angle and different whorl profile. Dyrislintea (Conrad, 1871) Figs 49-58 *v 1871 Isaea lintea Conrad: 193; pi. 10, fig. 6. 1878 Hydrobia (Isaea) lintea (Conrad) Boettger: 493. 1924 Isaea lintea Conrad; Roxo: 49. 1926 Hydrobia (Conradia) lintea (Conrad); Wenz: 1970. 1938 Hydrobia (Conradia) lintea (Conrad); de Greve: 83 (pars); pi. 1, figs 10-28 (non figs 29, 30). 1966 Tryonia lintea (Conrad) Taylor: 197. 1969 Dyris gracilis (Conrad); Parodiz: 118 (pars). 1980 Hydrobia lintea (Conrad); Costa: 879; pi. 1, figs 5,6. 1981 Hydrobia lintea (Conrad); Costa: 639; pi. 1, figs 3,4. HOLOTYPE. NYSM 9252, Late Caenozoic, Pebasian; Pichana, Peru (Hauxwell Colin). Other material studied. All Late Caenozoic, Pebasian. G25293-7, Pichana, Peru (Hauxwell Colin); GG19790-5, GG21676-9, GG21680/1-5, Pichana, Peru (Hauxwell Colin, extracted 1982); GG19961, GG21519, GG21681-5, Puerto Narino, Colombia (Weeda Colin). FURTHER OCCURRENCES. All late Caenozoic, Pebasian. Pebas (Boettger 1878); Tres Unidos (Roxo 1924, Costa 1981); Iquitos (de Greve 1938); CPCAN I, Tamandua, CPCAN II, Porere, CPCAN III, Sao Paulo de Olivenca, Afloramento em Italaia do Norte (Costa 1980). Upper Amazon Basin only. Diagnosis. Dyris up to 16 mm high with evenly convex whorls; sculptured with between six and ten spiral ribs per whorl on early whorls; later whorls with spiral grooves. Description. The description of the early whorls is based on the newly extracted juveniles from Pichana, as all the adults are damaged. The apex of 2-2lA whorls is naticiform and has a height and breadth of about mm. Spiral ribbing develops rapidly on the next whorl and the full nu
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