. Bulletin of the British Museum (Natural History). ARENIG TRILOBITES FROM BANGOR 13. Fig. 12 Neseuretus monensis (Shirley). All material from Carmel Formation, central Anglesey; British Geological Survey colln. a; (x 2-5), internal mould of free cheek, b; (x2-5), holotype; latex cast of external mould of cranidium. c, e, f: (x2-5), holotype; internal mould of cranidium. d: (x3), internal mould of cranidium. g: (x7-5), ornament on underside of doublure of free cheek, h: (x7-5), ornament on border of free cheek. Neseuretus monensis (Shirley 19
. Bulletin of the British Museum (Natural History). ARENIG TRILOBITES FROM BANGOR 13. Fig. 12 Neseuretus monensis (Shirley). All material from Carmel Formation, central Anglesey; British Geological Survey colln. a; (x 2-5), internal mould of free cheek, b; (x2-5), holotype; latex cast of external mould of cranidium. c, e, f: (x2-5), holotype; internal mould of cranidium. d: (x3), internal mould of cranidium. g: (x7-5), ornament on underside of doublure of free cheek, h: (x7-5), ornament on border of free cheek. Neseuretus monensis (Shirley 1936) Figs 12a-h 1919 Neseuretus parvifrons Salter; Greenly : 442, 446. 1936 1968 Synhomalonotus monensis Shirley: 401^02; pi. 30, figs 1^. Neseuretus monensis (Shirley) Bates : 193; pi. 14, figs 11, 16. Diagnosis. Nesueretus with oblique eye ridges, moderately long (sag.) anterior area 0-45 to 0-61 times preoccipital length (sag.) of glabella. No anterior furrow or border visible. Holotype. British Geological Survey colln Af831-2. Internal and external moulds of isolated cranidium. Material. Cranidia: Af830-2, Afl404, 56372. Free Cheek: Af831. All colln. Locality & OCCURRENCE. Carmel Formation, central Anglesey. Description. Cranidium. Four specimens were examined, including the holotype and another specimen (Af830) figured by Shirley (1936). Apart from the holotype, only internal moulds are preserved. The holotype is probably deformed; it is extensively cracked and if complete the right free check would be completely obscured in plan view whilst the left would be well exposed. Hence the furrows arc probably overdeepended. It was probably deformed by compression in the plane of the specimen, perpendicular to the axis. Specimen Af83() is probably the least deformed of the materia! examined. Cranidium outline is trape/oidal, the triangular form noted by Shirley being based on the deformed holotype. Ciiabcila has trapezoid outline, and stands well above paipciiral lobes.
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