. Catalogue of the Mesozoic plants in the Department of Geology, British Museum (Natural History). British Museum (Natural History). Dept. of Geology; Paleobotany -- Mesozoic; Paleobotany -- England London. CHARA. 13 1.—Chara Knowltoni, sp. nov. Type. Imperfectly preserved oogonia discovered by Mr. Rufford at Cliff End, near Hastings. British Museum. Registered number V. 1070«. Woodcut, Fig. 1. Oogonia broadly oval in form, the largest specimens about -Sm. long and approximately the same breadth at the broadest part. Surface marked with eleven or twelve ridges, arranged in the form of a flatte
. Catalogue of the Mesozoic plants in the Department of Geology, British Museum (Natural History). British Museum (Natural History). Dept. of Geology; Paleobotany -- Mesozoic; Paleobotany -- England London. CHARA. 13 1.—Chara Knowltoni, sp. nov. Type. Imperfectly preserved oogonia discovered by Mr. Rufford at Cliff End, near Hastings. British Museum. Registered number V. 1070«. Woodcut, Fig. 1. Oogonia broadly oval in form, the largest specimens about -Sm. long and approximately the same breadth at the broadest part. Surface marked with eleven or twelve ridges, arranged in the form of a flattened s^nral very little removed from the Fig. 1.—Oogonium of Chara Knowltoni, sp. nov. (V. lOTOff), x 30. Each specimen is covered by a thin and brittle layer of car- bonaceous matter, and in all probability the ridged surface is that of the enveloping cells, the substance of which is left as a black film moulded on the ridged and furrowed surface of the oospore. The examples on which this species is founded are confessedly meagre, and hardly such as to warrant the institution of an additional species. Such characters, however, as are available indicate very clearly marked differences from the Wealden species previously described. It may, therefore, serve a useful purpose to designate the British specimens by a new name, provided the fact be kept in mind that the material hitherto found in the English beds is not at all adequate for the purposes of thorough specific definition. I have ventured to name this species after Mr. Knowlton, who has recently added to our knowledge of fossil Charas. The present species differs from the other "Wealden form, Chara Jacrardi, in having many more surface ridges, and in its more globular and less elongated shape. The globular form may, however, as previously suggested, be, to a certain extent, the result of flattening. A specimen flgured by Squinabol' from Tertiary beds of Liguria, ^ Coutrib. Fl. foss. Liguria, vol. ii.
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