. Bulletin of the British Museum (Natural History), Geology. OF NORTH-WEST EUROPE 333 two prominent parallel ridges in the median part of the valve and two in the dorsal part. Between the ridges is a meandriform punctation and a faint reticulation. Material : 36 valves and carapaces from Biarritz. lo 4077-79. Type locality: Bastennes-Gaujacq; Stampian. Strati GRAPHICAL range and distribution: Bast ennes-Gauj acq, Lourquen; Stampian. Couches du Phare, Biarritz; Stampian. Dimensions : Left valve Right valve L H L/H L H L/H Female 0-95 0-56 170 0-95 0-49 1-94 Male 1-04 0-55 1-89 i-oo 0-50 2-00 Di
. Bulletin of the British Museum (Natural History), Geology. OF NORTH-WEST EUROPE 333 two prominent parallel ridges in the median part of the valve and two in the dorsal part. Between the ridges is a meandriform punctation and a faint reticulation. Material : 36 valves and carapaces from Biarritz. lo 4077-79. Type locality: Bastennes-Gaujacq; Stampian. Strati GRAPHICAL range and distribution: Bast ennes-Gauj acq, Lourquen; Stampian. Couches du Phare, Biarritz; Stampian. Dimensions : Left valve Right valve L H L/H L H L/H Female 0-95 0-56 170 0-95 0-49 1-94 Male 1-04 0-55 1-89 i-oo 0-50 2-00 Discussion: In shape and ornamentation this is easily distinguished from other species of Cytheretta. See also C. sagri and C. minipustulosa. Cytheretta minipustulosa sp. nov. (PI. 21, figs 1-4; Text-fig. 29) Derivation of name: Latin—mini, small; pustulosa, full of pimples; refers to the ornamentation between the longitudinal ridges. Diagnosis : A species of Cytheretta with eleven longitudinal ridges, four of which join in the anterior to form two concentric ovals open towards the posterior. Between the ridges are faint cross-ridges and a meandriform punctation. HoLOTYPE: lo 4080, a male right valve. Paratypes: Io 4081-83. Material: 15 valves and carapaces from Biarritz; i valve from Gaas. Type locality and horizon : Biarritz; Couches du Phare superieur. Stratigraphical range and distribution: Couches du Phare, Biarritz (Stampian); Espibos (Gaas), Stampian. Description : In lateral view the carapace is rectangular. Sexual dimorphism is not very pronounced, the males being more elongate. The left valve has a posterior. Fig. 29. Cytheretta minipustulosa; male right 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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