. Bulletin of the British Museum (Natural History). PEBASIAN MOLLUSCAN FAUNAS 245. Figs 243-247 Hemisinus brasiliensis (S. Moricand). 243, NYSM 9226; holotype of Hemisinus sulcatus Conrad, figured by Conrad (1871: pi. 10, fig. 2); Pebasian; Pichana, Peru, a, b, front, side, x 244, BMZD 1984214/1; shell figured by Reeve (1860: pi. 1, fig. 5) as H. brasiliensis; Recent; 'Pernambuco' = Recife, Brazil; Cuming Colin; front, x 245, BMZD 1984214/2; previously unfigurcd shell from same sample as Fig. 244; front, x 246, BMZD 1984215; lectotype (selected herein) of Melania venez
. Bulletin of the British Museum (Natural History). PEBASIAN MOLLUSCAN FAUNAS 245. Figs 243-247 Hemisinus brasiliensis (S. Moricand). 243, NYSM 9226; holotype of Hemisinus sulcatus Conrad, figured by Conrad (1871: pi. 10, fig. 2); Pebasian; Pichana, Peru, a, b, front, side, x 244, BMZD 1984214/1; shell figured by Reeve (1860: pi. 1, fig. 5) as H. brasiliensis; Recent; 'Pernambuco' = Recife, Brazil; Cuming Colin; front, x 245, BMZD 1984214/2; previously unfigurcd shell from same sample as Fig. 244; front, x 246, BMZD 1984215; lectotype (selected herein) of Melania venezuelensis Reeve, figured by Reeve (1859: pi. 13, fig. 81); Recent; Porto Cabello, Venezuela; Cuming Colin; front, 247, BMZD 1984216; lectotype (selected herein) of Hemisinus tenellus Reeve, figured by Reeve (I860: pi. 2, fig. 6); 'Pernambuco' = Recife, Brazil; Cuming Colin; front, x browni Etheridge. The material from Loc. 42, Mangan For- mation in the Cuenca Basin described but not figured in Bristow & Parodiz (1982: 47) as Aylacostoma sulcatus is here reidentified as Hemisinus sp. (GG21225/1-6, p. 246). Ayla- costoma sp. (GG19866/1-3, p. 261) also occurs at this locality. Hemisinus () corrosensis Pilsbry & Olsson, 1935 Fig. 248 v* 1935 Hemisinus (Basistoma) corrosensis Pilsbry & Olsson: 12; pi. 2, figs 8, 9. v 1969 Doryssa corrosensis (Pilsbry & Olsson) Parodiz: 136. Holotype. ANSP 13092, originally figured by Pilsbry & Olsson (1935: pi. 2, fig. 8). Los Corros Formation, Tertiary; Rio Succio, a branch of Rio Llano, Magdalena Valley, Colombia (Olsson & La Tour Collection). An unknown number of paratypes (not seen) arc stated to be in Olsson's collection (Pilsbry & Olsson: 12), and include the specimen figured originally as pi. 2, fig. 9. Other details as above. No further material. DIAGNOSIS. Hemisinus with spire angle of 30°; early whorls smooth; spiral sculpture of 5 - 6 grooves on later spire whorls and 10- 12 on final whorl; colla
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