. Bulletin of the British Museum (Natural History). 342. 341b Figs 341-344 Mytilopsis sallei (Recluz). Late Oligocene, Panama; originally described as Dreissensia dalli Clerc in Joukowsky & Clerc, from Bombacho, western Panama. Joukowsky Colin, Geneva NHM, all x 3. 341, lectotype (herein selected), shell figured by Clerc (in Joukowsky & Clerc 1906: pi. 1, figs 4, 5). a, right side; b, front view. 342, paralectotype, same details as Fig. 341 (originally figured as pi. 1, fig. 2); left side. 343, paralectotype, same details as Fig. 341 (originally figured as pi. 1, fig. 3); rig
. Bulletin of the British Museum (Natural History). 342. 341b Figs 341-344 Mytilopsis sallei (Recluz). Late Oligocene, Panama; originally described as Dreissensia dalli Clerc in Joukowsky & Clerc, from Bombacho, western Panama. Joukowsky Colin, Geneva NHM, all x 3. 341, lectotype (herein selected), shell figured by Clerc (in Joukowsky & Clerc 1906: pi. 1, figs 4, 5). a, right side; b, front view. 342, paralectotype, same details as Fig. 341 (originally figured as pi. 1, fig. 2); left side. 343, paralectotype, same details as Fig. 341 (originally figured as pi. 1, fig. 3); right side. 344, paralectotype, same details as Fig. 341 (originally figured as pi. 1, fig. 1); right side. as in the type illustration (Recluz 1852) of M. sallei and in BMZD specimens from Mexico (Marelli & Berrend 1978). Other Recent shells are dirty white with a yellow-brown periostracum, as shown in Reeve's (1858) illustrations of M. sallei, M. rossmassleri and M. morchiana. Some specimens show dark purple concentric banding, which is normally more intense on the inner shell surface. Dimension. In mm. diag 1 1 h vbr l/h D. sallei Recluz 1852 (from type illustration) M. sallei, shell fig'd Reeve, 1858: fig. 44. M. rossmassleri, shell fig'd Reeve: 1858, fig. 45. BMZD , Guatemala BMZD , Guatemala LL27915, Pebasian, Canama. LL27966, Pebasian, Puerto Narifio. PIMUZ 804, C. fragilis Boettger, Iquitos; de Greve 1938: pi. 9, fig. 15. PIMUZ 820, as above, var. II, fig. 24. PIMUZ 821, as above, var. II, fig. 23. PIMUZ 826, as above, var. Ill, fig. 26. Note. The measurements of PIMUZ specimens are taken partly from de Greve's text and partly from his plates. The length measurements he gave in his text correspond to dia
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