. Bulletin of the British Museum (Natural History). PEBASIAN MOLLUSCAN FAUNAS 221. 184d Figs 183-184 Toxosoma eborea Conrad. Pebasian; Puerto Narifio, Colombia; Weeda Colin. 183, upper spire from side, x 20; d, oblique view of apex, x 50. 184, GG19991; a, front, x 10; b, side, x x GG19990; a, front, x 10; b, side, x 10; c, 10; c, base, x ; d, oblique view of base. Dimensions. In mm. h br hap sa GG19835/1, Pichana. () 53° GG21635, Pichana. GG21636, Pichana. GG19834/1, Canama (fig'd Etheridgc, 1879: pi. 1, fig. 7). () 48° GG19834/2, Canama. 4
. Bulletin of the British Museum (Natural History). PEBASIAN MOLLUSCAN FAUNAS 221. 184d Figs 183-184 Toxosoma eborea Conrad. Pebasian; Puerto Narifio, Colombia; Weeda Colin. 183, upper spire from side, x 20; d, oblique view of apex, x 50. 184, GG19991; a, front, x 10; b, side, x x GG19990; a, front, x 10; b, side, x 10; c, 10; c, base, x ; d, oblique view of base. Dimensions. In mm. h br hap sa GG19835/1, Pichana. () 53° GG21635, Pichana. GG21636, Pichana. GG19834/1, Canama (fig'd Etheridgc, 1879: pi. 1, fig. 7). () 48° GG19834/2, Canama. + () 45° GG19834/3, Canama. + () 40° GG 19990, Puerto Narino. 50° GG 19991, Puerto Narino. 50° Note. Breadth measurements in brackets include the apertural wing. Height to breadth ratios of this species are not given because the wing introduces a variable factor. Remarks. Kadolsky (1980) has rcdcscribcd this species in detail, but gave no dimensions. The illustrations in Costa (1981) eonfirm Roxo's earlier (1924) record from Tres Unidos. The numerous specimens obtained from Puerto Narino tend to be relatively large and also have rather convex whorl profiles and comparatively weak columellar folds. Unfortu- nately the wing-like outer lip of these shells is invariably broken. Nevertheless, they appear to be close enough in all essential features to be considered as belonging to the same species as the shells from Pichana in BMPD. In specimens from both Pichana and Puerto Narino, the growth lines are extremely sinuous, particularly on the last whorl during growth of which the outer lip becomes increasingly produced. An umbilicus is present even in comparatively large immature specimens: it becomes plugged onl\ in the late growth stages The columellar plait dies away just before it reaches the inner lip, and is therefore often rather difficult to sec in mature specimens with strongly produced outer lips. Broken speci- mens reveal t
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