. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. ferax baja humilis hartmanni crenulata. capensis hartmanni Fig. 56. Outlines of Xestoleberis species from southern Africa. A-B. X. africana (Brady, 1880), TBD 6847, 94 m. A. SAM-PQ-MF0574, LV. B. SAM-PQ-MF0573, RV. C-D, Q. X. ramosa Muller, Simonstown harbour, traced from Muller (1908: 129). C. LV. D. RV. Q. Carapace, dorsal view. E-F, R. X. capensis Muller, Simonstown harbour, traced from Muller (1908: 127). E. LV. F. RV. R. Carapace, dorsal view. G-H, S. X. hartmanni sp. nov., TBD 6825, 160 m. G. S
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. ferax baja humilis hartmanni crenulata. capensis hartmanni Fig. 56. Outlines of Xestoleberis species from southern Africa. A-B. X. africana (Brady, 1880), TBD 6847, 94 m. A. SAM-PQ-MF0574, LV. B. SAM-PQ-MF0573, RV. C-D, Q. X. ramosa Muller, Simonstown harbour, traced from Muller (1908: 129). C. LV. D. RV. Q. Carapace, dorsal view. E-F, R. X. capensis Muller, Simonstown harbour, traced from Muller (1908: 127). E. LV. F. RV. R. Carapace, dorsal view. G-H, S. X. hartmanni sp. nov., TBD 6825, 160 m. G. SAM-PQ-MF0578, holotype, LV. H. SAM-PQ-MF0580, RV. S. SAM-PQ-MF0579, carapace, dorsal view. I-J. X. crenulata Klie, Luderitz Bay, traced from Klie (1940, figs 44-45). I. LV. J. RV. K-L. X. ferax Klie, Luderitz Bay, traced from Klie (1940, figs 51-52). K. LV. L. RV. M-N. X. baja Klie, Luderitz Bay, traced from Klie (1940, figs 57-58). M. LV. N. RV. O-P. X. humilis Klie, Liide- ritz Bay, traced from Klie (1940, figs 61-62). O. LV. P. RV. Scale bars = 200 microns; other scales not known. somewhat drawn out posteriorly. Valve surface is smooth, with numerous, distinct, but small normal pore openings. Internal features. Marginal areas are relatively narrow, but in the material avail- able details were not well preserved. The hinge is antimerodont, with relatively short terminal elements, with a locellate ME in the RV. No unambiguous views of the MS were obtained because of generally poor preservation, but the adductors consist of four elongate scars, with a small U- or V-shaped anterior scar and a further small ven- trally adjacent scar (Fig. 58). The 'Xestoleberis' spot is indistinct, dorsally situated and small. There is no well-developed eye socket. Remarks None of the other locally occurring species of Xestoleberis possesses a comparably 'angular' outline to X. hartmanni (Fig. 56). Although the outline of the RV of X. ramosa is similar, the DM outline of the LV of Muller's specie
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