. Bulletin of the British Museum (Natural History), Geology. 340 MID-TERTIARY CYTHERETTINAE Flexus gutzwilleri (Oertli) (PL 22, fig. 4) 1956 Cytheretta gutzwilleri Oertli, p. 64, pi. 8, figs 189—192. Material: 31 valves and carapaces from the topmost Couches du Phare (RO 270, 271). lo 4098-99. Type locality and horizon : Therwil (near Basel); Cyrenenmergel (Lower Chattian). Stratigraphical RANGE AND DISTRIBUTION: Lower Chattian of Therwil; Couches du Phare, Biarritz. Flexus solentensis sp. nov. Derivation of name: After the Solent. Diagnosis : A small species of the genus Flexus with a thick a
. Bulletin of the British Museum (Natural History), Geology. 340 MID-TERTIARY CYTHERETTINAE Flexus gutzwilleri (Oertli) (PL 22, fig. 4) 1956 Cytheretta gutzwilleri Oertli, p. 64, pi. 8, figs 189—192. Material: 31 valves and carapaces from the topmost Couches du Phare (RO 270, 271). lo 4098-99. Type locality and horizon : Therwil (near Basel); Cyrenenmergel (Lower Chattian). Stratigraphical RANGE AND DISTRIBUTION: Lower Chattian of Therwil; Couches du Phare, Biarritz. Flexus solentensis sp. nov. Derivation of name: After the Solent. Diagnosis : A small species of the genus Flexus with a thick anterior marginal rim and thick longitudinal ridges. Two subspecies have been recognized. Flexus solentensis solentensis subsp. nov. (PI. 23, figs 7-10; Text-fig. 30) 1957 Cytheretta gracilicosta Keij (non Reuss), p. 135, pi. 10, fig. 5. 1968 Cytheretta gracilicosta Haskins (non Reuss), p. 166, pi. 3, figs i^io. Holotype: Io 4100, a female left valve. Paratypes: Io 4101-2. Material: Barton: EBA i (Bed F), 4 valves; EHC 2 (Bed D), 2 carapaces. Alum Bay: Middle Barton Beds, 5 valves and carapaces. Type locality and horizon : Barton; Middle Barton Beds, Bed F, Stratigraphical range and distribution : Middle Barton Beds of Barton and Alum Bay. Diagnosis and description: Sexual dimorphism is distinct; sex ratio, i : 3 The left valve has a strong posterior hinge ear and a very weak anterior one; the. Fig. 30. Flexus solentensis solentensis; female left valve; Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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