. Bulletin of the British Museum (Natural History). PEBASIAN MOLLUSCAN FAUNAS 219 176 177a 177b â. 178a 178b 178c 178d Figs 176-178 Tropidobora tertiana (Conrad). Pebasian; Peru. 176, ANSP 16151, holotype (of Pachytoma tertiana Conrad) figured by Conrad (1874a: pi. 1, fig. 11) and by Pilsbry (1944: text-fig. 2); either Pebas, Old Pebas or Pichana; Steere Colin; front, x 10. 177, GG21630; Pichana; Hauxwell Colin; a, front; b, side; c, base; all x 10. 178, G25294; Pichana; Hauxwell Colin; a, front, x 10; b, oblique view of base, x 10: c. side view, x 8; d, base, x 8. (This specimen was
. Bulletin of the British Museum (Natural History). PEBASIAN MOLLUSCAN FAUNAS 219 176 177a 177b â. 178a 178b 178c 178d Figs 176-178 Tropidobora tertiana (Conrad). Pebasian; Peru. 176, ANSP 16151, holotype (of Pachytoma tertiana Conrad) figured by Conrad (1874a: pi. 1, fig. 11) and by Pilsbry (1944: text-fig. 2); either Pebas, Old Pebas or Pichana; Steere Colin; front, x 10. 177, GG21630; Pichana; Hauxwell Colin; a, front; b, side; c, base; all x 10. 178, G25294; Pichana; Hauxwell Colin; a, front, x 10; b, oblique view of base, x 10: c. side view, x 8; d, base, x 8. (This specimen was unfortunately destroyed before figures c and d could be repeated). Dimensions. In mm. h br h/br sa Holotype, ANSP 16151 80° G25294 65° GG21630 75° Note. Because the peripheral flange increases in relative strength with growth, the spire angle becomes more obtuse with growth. The figures given arc the maximum. Remarks. This rare species cannot be confused with any other South American Cacnozoic or Recent gastropod. Dif- ferences between it and some species of the living Potamo- lithus arc discussed above (p. 215). Genus TOXOSOMA Conrad, 1874a [= Liosoma Conrad, 1874a: 31 (type species Liosoma carta Conrad, 1874a: 31: Pebasian; Pebas, Old Pebas or Pichana. By monotypy); = Pseudolacuna Bocttgcr, 1878: 495 (type species Pseudolacuna macroptera Boettger, 1878: 496; Pebas. By monotypy); = Alycaeodonta Etheridgc, 1879: 85 (foot- note), a nomen nudum, and acknowledged as a synonym of Pseudolacuna by Etheridgc himself.] Type SPECIES. Toxosoma eboreum Conrad, 1874a: 31; Late Cacnozoic, Pebasian; Pebas, Old Pebas or Pichana. B) monotypy, no other species assigned. Confined to Late Cacnozoic, Pebasian. of the Upper Amazon Basin. The suprageneric position of Toxosorna is discussed on p. 216 under Lithoglyphinae. Toxosoma eborea Conrad, 1874a rigs po 1S4 *. 1874a Toxosoma eborea Conrad: 31; pi. 1, tig. 7. *. 1874a Liosoma carta Conrad: 31; pi
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