. Bulletin of the British Museum (Natural History), Geology. OF NORTH-WEST EUROPE 331 Diagnosis and description: A subspecies of C. sagri showing variation in shape and ornamentation. The latter consists of thirteen longitudinal ridges which in some specimens cover the whole valve and in others only the posterior region. It consists predominantly of Morphotype C with A and B. HoLOTYPE: lo 4067, a female left valve. Paratypes: Io 4068-70. Material: See fig. 27. Type locality and horizon: Chateau Romefort, Blaignan; Argiles a Algues, Sannoisian. Stratigraphical range and distribution: So far onl
. Bulletin of the British Museum (Natural History), Geology. OF NORTH-WEST EUROPE 331 Diagnosis and description: A subspecies of C. sagri showing variation in shape and ornamentation. The latter consists of thirteen longitudinal ridges which in some specimens cover the whole valve and in others only the posterior region. It consists predominantly of Morphotype C with A and B. HoLOTYPE: lo 4067, a female left valve. Paratypes: Io 4068-70. Material: See fig. 27. Type locality and horizon: Chateau Romefort, Blaignan; Argiles a Algues, Sannoisian. Stratigraphical range and distribution: So far only known from the type locality. siONS: Carapaces Morphotype B Morphotype C L H L/H w L H L/H W Female 078 0-43 i-8i 0-38 0-92 0-53 174 0-47 Male 0-83 0-43 1-93 0-39 0-95 0-47 2-02 0-42 Cytheretta sagri martini subsp. nov. (PL 20, figs 1-4) Derivation of name: From the Phare St. Martin, Biarritz. Diagnosis and description: A subspecies of C. sagri of a triangular shape in lateral view and with a weak ornamentation. It consists of Morphotypes D, E and F, particularly the last two. Holotype: Io 4071, a female left valve. Paratypes: Io 4072-6. Material: See fig. Fig. 28. Cytheretta sagri Deltel; female left valve. X75. 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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