. Bulletin of the British Museum (Natural History). PEBASIAN MOLLUSCAN FAUNAS 247. LONGIVERENA Fig. 250 Ncogene distribution of Longiverena. Key as for Fig. 6 (p. 177). Inset: L. eucosmia (Pilsbry & Olsson), x 2; Mugrosa formation; Magdalena Valley, Colombia. 1954: 377) independently made the same choice; his 1952 paper was an abstract of a meeting report and is possibly not valid. Wenz (1939: 719) gave the distribution of the genus as being Oligocene, ?Europe; Oligocene, Colombia; Recent, South America and West Indies. I am unaware of any species from outside South America. Ayla
. Bulletin of the British Museum (Natural History). PEBASIAN MOLLUSCAN FAUNAS 247. LONGIVERENA Fig. 250 Ncogene distribution of Longiverena. Key as for Fig. 6 (p. 177). Inset: L. eucosmia (Pilsbry & Olsson), x 2; Mugrosa formation; Magdalena Valley, Colombia. 1954: 377) independently made the same choice; his 1952 paper was an abstract of a meeting report and is possibly not valid. Wenz (1939: 719) gave the distribution of the genus as being Oligocene, ?Europe; Oligocene, Colombia; Recent, South America and West Indies. I am unaware of any species from outside South America. Aylacostoma glabrum Spix and Longiverena tuberculata (Spix) appear to be very similar in many important respects except that L. tuberculata is strongly sculptured whilst A. glabrum is almost smooth. In the future, increased under- standing of the South American fauna may lead to this distinction being regarded as not of generic significance. This would, however, raise the problem of the generic assignment of the fossil species, with the exception of L. colombiana sp. nov., here placed in Longiverena, as they would be most unlikely to fit comfortably in Aylacostoma in any future reclassification. Longiverena tuberculata (Spix, in Spix & Wagner 1827) Figs 251-255 *v 1827 Aylacostoma tuberculata Spix, in Spix & Wagner: pi. 8, fig. 4. v. 1827 Melania tuberculata Wagner, in Spix & Wagner: 15. *v. 1860 Hemisinus olivaceus Reeve (ex Behn MS): pi. 3, fig. 12a, b. 1878 Hemisinus tuberculatus (Wagner) Brot: 397; pi. 41, figs 10, lOa-d. 1902 Hemisinus tuberculatus (Wagner); von Ihering: 667 1935 Hemisinus (Longiverena) tuberculatus (Spix); Pilsbry & Olsson: 11. 1939 Hemisinus (Longiverena) tuberculatus (Wagner); Wenz: 719, fig. 2078. 1954 Aylacostoma (Longiverena) tuberculata Spix; Morrison: 377. 1983« Aylacostoma tuberculata Spix = Melania tuberculata Wagner; Fechter: 222. Lectotype (selected herein) of A. tuberculata Spix, the specimen almost certainly figured by Spix 1827;
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