. Bulletin of the British Museum (Natural History). . CP. NUTTALL Figs 7- 8 Neritina ortoni Conrad. Pebasian, Canama, Peru; Brown Colin. 7a-c, GG19993, lectotype (herein selected) of Neritina puncta Etheridge, 1879; front view, oblique view into aperture, rear view. 8, GG21777, a paralectotype of the same, showing apical region. All x 5. SYSTEMATIC PALAEONTOLOGY Class GASTROPODA Cuvier Subclass PROSOBRANCHIA Milne Edwards Order ARCHAEOGASTROPODA Thiele Superfamily NERITACEA Lamarck, 1809 [nom. transl. Thiele (1929: 71), ex neritacees Lamarck (1809: 319); Neritacea Rafinesque (1815: 1
. Bulletin of the British Museum (Natural History). . CP. NUTTALL Figs 7- 8 Neritina ortoni Conrad. Pebasian, Canama, Peru; Brown Colin. 7a-c, GG19993, lectotype (herein selected) of Neritina puncta Etheridge, 1879; front view, oblique view into aperture, rear view. 8, GG21777, a paralectotype of the same, showing apical region. All x 5. SYSTEMATIC PALAEONTOLOGY Class GASTROPODA Cuvier Subclass PROSOBRANCHIA Milne Edwards Order ARCHAEOGASTROPODA Thiele Superfamily NERITACEA Lamarck, 1809 [nom. transl. Thiele (1929: 71), ex neritacees Lamarck (1809: 319); Neritacea Rafinesque (1815: 144) (family); Neritadae Fleming (1828: 318) (family)]. Family NERITIDAE Lamarck, 1809 [nom. correct. Gray (1840: 147)] Subfamily NERITINAE Lamarck, 1809 [nom. transl. Swainson (1840: 239, 346)] Neritacea and Neritidae are here attributed to Lamarck (1809). This predates the usually accepted authorship of Rafinesque (1815) quoted by Keen in Moore (1960: 1275). Genus ? NERITINA Lamarck, 1816 1766 (ICZN Opinion Type species. Nerita pulligera Linne, 119, 1931). Recent, Indo-Pacific. Remarks. The Pebasian Neritininae are here all placed within one species, Neritina ortoni Conrad, 1871. This is close to, and possibly conspecific with, a shell from the Miocene of Venezuela identified by Jung (1965) as Neritina aff. woodwardi Guppy (1866) originally described from the Neogene of Jamaica. Some doubt must be expressed about the generic assign- ment of ortoni. Firstly, it has been impossible to find any other reasonably similar species, either fossil or Recent, from either the western Pacific or the Caribbean (Flores & Caceras 1973, Keen 1971, Russell 1941). Secondly, the apertural features are reminiscent of, but by no means identical to, two marine genera with extremely widespread distribution: the large patelliform Velates (Cretaceous-Eocene) and the much smaller (c. 5 mm diameter) Smaragdia (Neogene-Recent), which is placed in its own Subfamily Smaragdiinae. Thirdly, the only oper
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