. Bulletin of the British Museum (Natural History), Geology. 196 CALLOVIAN TO TITHONIAN Description. Carapace outline as illustrated and showing marked sexual dimorphism. The absence of ornamentation emphasizes the deep antero-dorsal furrow and the simple normal pore canal openings. Hinge lobodont (Text-fig. 12), although details of the median element are obscured owing to the state of preservation. Duplicature of moderate width without a vestibule and with straight to slightly curved anterior marginal pore canals which are few in number and widely spaced. Muscle scars not seen. Dimensions. Ho


. Bulletin of the British Museum (Natural History), Geology. 196 CALLOVIAN TO TITHONIAN Description. Carapace outline as illustrated and showing marked sexual dimorphism. The absence of ornamentation emphasizes the deep antero-dorsal furrow and the simple normal pore canal openings. Hinge lobodont (Text-fig. 12), although details of the median element are obscured owing to the state of preservation. Duplicature of moderate width without a vestibule and with straight to slightly curved anterior marginal pore canals which are few in number and widely spaced. Muscle scars not seen. Dimensions. Holotype. , female carapace (PI. 9, fig. 3), length 0-82 mm ; height 0-47 mm ; width 0-45 mm. Paratypes : , female carapace (PI. 9, fig. 1), length 0-76 mm ; height 0-44 mm ; width 0-44 mm. , male carapace (PI. 9, fig. 2), length 0-88 mm ; height 0-46 mm ; width 0-42 mm. , male carapace (PI. 8, fig. 14), length 0-88 mm ; height 0-48 mm ; width 0-43 mm. , female carapace (PI. 9, fig. 4), length 077 mm ; height 0-43 mm ; width 0-43 mm. Discussion. This is a distinctive species superficially resembling the ostracod Fabanella bathonica (Oertli 1957) from the Bathonian of Europe, but it differs totally in internal details and externally in the presence of an antero-dorsal furrow. Afrocytheridea faveolata sp. nov. PI. 8, figs 12, 13 ; Text-fig. I3a-d Diagnosis. Afrocytheridea with distinct reticulate ornamentation. Holotype. , female right valve, sample B97 (PI. 8, fig. 12). Paratypes. and , sample B97. Horizon and Locality. Anticline (Text-fig. 3). Middle Callovian, samples B97 and B114. Mandawa. Fig. I3a-d. Afrocytheridea faveolata sp. nov. a. Anterior teeth and antero-median sockets, right valve hinge, paratype b. Anterior part of median hinge bar to show enlarged antero-median teeth, left valve, paratype c. External view, left valve, paratype d. Anterior marginal pore canals, left valve, paratype


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