. Bulletin of the British Museum (Natural History). Pachydon cebada (Anderson, 1928) 418 Figs 418-419 Pachydon trigonalis sp. nov. Pebasian; Canama, Peru; Barrington Brown Colin. Paratypes, both x 10. 418, LL28007/1; left valve. 419, LL28007/2; right valve. Figs 420-425 fig. 15, tcxt- *v 1928 Corbula cebada Anderson: 24; pi figs 6, 7. *v 1928 Corbula scheibi Anderson: 25 {pars); pi. 1, figs 16, 17 {non fig. 18); (non text-figs 8, 9). *v 1935 Corbula (Corbula) abundans Pilsbry & Olsson: 19; pi. 2, figs 13, 14. *v 1935 Corbula (Erodona ?) magdalensis Pilsbry & Olsson: 20; pi. 4
. Bulletin of the British Museum (Natural History). Pachydon cebada (Anderson, 1928) 418 Figs 418-419 Pachydon trigonalis sp. nov. Pebasian; Canama, Peru; Barrington Brown Colin. Paratypes, both x 10. 418, LL28007/1; left valve. 419, LL28007/2; right valve. Figs 420-425 fig. 15, tcxt- *v 1928 Corbula cebada Anderson: 24; pi figs 6, 7. *v 1928 Corbula scheibi Anderson: 25 {pars); pi. 1, figs 16, 17 {non fig. 18); (non text-figs 8, 9). *v 1935 Corbula (Corbula) abundans Pilsbry & Olsson: 19; pi. 2, figs 13, 14. *v 1935 Corbula (Erodona ?) magdalensis Pilsbry & Olsson: 20; pi. 4, fig. 8. Holotype of Corbula cebada (Anderson), CAS 2706, and unfigured paratypes, CAS 2707-14, 'from near San Juan dc Rio Seco, eastern border of the Upper Magdalena Valley. Colombia, from near the base of the Guaduas Group, not far above the horizon of the coal veins' (Anderson 1928). Originally dated as Eocene, this locality is here redated as 421a 421b. 9, ' 'S> 425a 425b Figs 420-425 Pachydon cebada (Anderson). Probably all Neogene; Colombia. 420, CAS 2706. holotype of Corbula cebada Anderson; figured by Anderson (1928: pi. I, fig. 15; text-figs 6, 7), probably Santa Teresa Formation; from near San Juan de Rio Seco. probably near km 106. Cambao to Bogota Highway, a-c, left, front and ventral views, x 5. 421, ANSP 13077a, lectotype (herein selected) of Corbula abundans Pilsbry & Olsson; figured by Pilsbry & Olsson (1935: pi. 2, figs 13, 14); Miocene; La Cira Formation. Zopffs, near 1 a C ira. Colombia, a-c. left, dorsal, and ventral views, x 5. 422, ANSP 13077, previously unfigured paralectotypc of Corbula abundans, same details as lectotype; right valve, x 8. 423, ANSP 13075, left valve of the almost entirely decorticated lectotype (herein selected) of Corbula magdalensis Pilsbr\ & Olsson, figured by Pilsbry & Olsson (1935: pi. 4. tig. 8), from same locality as ( orbida abundans: X 5. 424. CAS 2717. right valve of holotype of Corbula scheibi Anderson; s
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