. Bulletin of the British Museum (Natural History), Geology. i24 FLORA OF THE LOWER HEADON BEDS occurring in Bed 10 below Hordle House () and east of Beckton Bunny (). Usually the thin black epidermis has been destroyed and the thick inner integument is heavily impregnated with pyrites. It was pointed out (Chandler, 1925 : 27) that there is a close resemblance to Zanthoxylum (Fagara) ailanthoides Sieb. & Zucc. from which the fossil differs in the rarity or absence of transverse ridges connecting the concentric wrinkles, in its lesser degree of inflation, in its less convex
. Bulletin of the British Museum (Natural History), Geology. i24 FLORA OF THE LOWER HEADON BEDS occurring in Bed 10 below Hordle House () and east of Beckton Bunny (). Usually the thin black epidermis has been destroyed and the thick inner integument is heavily impregnated with pyrites. It was pointed out (Chandler, 1925 : 27) that there is a close resemblance to Zanthoxylum (Fagara) ailanthoides Sieb. & Zucc. from which the fossil differs in the rarity or absence of transverse ridges connecting the concentric wrinkles, in its lesser degree of inflation, in its less convex ventral margin and its ventral orifice to the raphe canal as contrasted with the basiventral orifice of the living. Additional fossils since found merely increase the known variation in size of the species which further experience suggests deserves a distinct name. It is therefore called Z. hordwellense. Zanthoxylum compressutn Chandler (PL 26, figs. 65-67 ; Text-fig. 3) 1925. Zanthoxylon compressutn Chandler, p. 28, pi. 4, fig. 5. Diagnosis. Seed rounded subquadrangular in outline, broadest dorsiventrally. Hilum very short, concave. Length of seed parallel with hilar scar, 3-25 to 3-5. Fig. 3. Zanthoxylum compressum Chandler. Longitudinal section through a seed to show relative positions of hilar scar (h), hilar opening (ho), raphe (r) and chalaza (ch). X 12 approx. mm. ; maximum diameter, 375 to 4 mm. approximately at right angles to scar. Holotype. Brit. Mus. (), No. Description. (Slightly emended) Seed: Semi-anatropous, rounded subquad- rangular in outline, broadest dorsiventrally, much compressed. Ventral margin short, concave, occupied by the sunk subtriangular hilar scar. Opposite margin rounded, the internal chalaza being situated where this rounded margin gradually merges into the lower long lateral margin of the seed (as revealed by a break in the testa of the second specimen). Raphe, connecting the lower broad end of the hilar scar with the chalaza, a l
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