. Bulletin of the British Museum (Natural History). PEBASIAN MOLLUSCAN FAUNAS 275. Fig. 314 Haplothaerus capax Conrad. Copy of type illustration at original size (Conrad 1874/?: pi. 12, fig. 1). Pebasian; Iquitos; specimen presumed lost (ex ANSP). Magnification not known. above diagnosis is, as explained on p. 264, probably also of superfamilial significance. At the very least, it may be used, as here, to distinguish between species of Diplodon and Anodontites which sometimes have very similar outlines. Anodontites (Anodontites) batesi (Woodward, 1871) Fig. 315 *v. 1871 Anodon batesi
. Bulletin of the British Museum (Natural History). PEBASIAN MOLLUSCAN FAUNAS 275. Fig. 314 Haplothaerus capax Conrad. Copy of type illustration at original size (Conrad 1874/?: pi. 12, fig. 1). Pebasian; Iquitos; specimen presumed lost (ex ANSP). Magnification not known. above diagnosis is, as explained on p. 264, probably also of superfamilial significance. At the very least, it may be used, as here, to distinguish between species of Diplodon and Anodontites which sometimes have very similar outlines. Anodontites (Anodontites) batesi (Woodward, 1871) Fig. 315 *v. 1871 Anodon batesi Woodward: 103, pi. 5, fig. 10. *? 1874a Anodonta pebasana Conrad: 29, pi. 1, fig. 5. 1878 Anodonta batesi (Woodward) Boettger: 498. HOLOTYPE. BMPD L27743, Late Caenozoic, Pebasian; Pichana, Peru (Hauxwell colln). Holotype of A. pebasana Conrad presumed lost, as not located in ANSP (Johnson & Baker, 1973: 165). No further material. Distribution. Late Caenozoic, Pebasian only, A. batesi as above; A. pebasana either Pebas, Old Pebas or Pichana (Conrad 1874a). Diagnosis. Elongate Anodontites with minute umbones hardly projecting above long, straight, hinge line; anterior and posterior margins both meeting hinge line at definite angle; posteriorly incipiently alate; ventral margin fairly straight, sloping downwards towards posterior; shell surface smooth except for growth lines; edentulous. Description. The shell of the holotype and only available specimen is partly decorticated. Its outline is considerably modified due to damage to its antcrodorsal and posterior regions. Study of growth lines shows that anteriorly the ventral margin curves smoothly upwards into the anterior margin, which eventually becomes recurved and meets the hinge line at a definite angular junction. Posteriorly, the ventral margin also forms a smooth curve with the posterior margin. The latter is rather truncated in the region of mid shell-height, before being recurved into an incipient alation. The junct
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