Geology and paleontology / by B.K. Emerson [and others].

Date:
[1910]
Catalogue details

Licence: In copyright

Credit: Geology and paleontology / by B.K. Emerson [and others]. Source: Wellcome Collection.

    253/318 (page 155)
    Spitzbergen referred by Heer to Ulmus braunii,* but it seems impos- sible that they should belong to this genus. They do not altogether agree with Corylus, yet seem perhaps closer to this than to any other. For the present they may remain under this name. Alnus corylifolia Lesq. Alnus corylifolia Lesq., Proc. U. S. Nat. Mus., vol. v, p. 446, pi. vii, figs. 1-4, 1882. The collection contains several perfect and beautifully preserved leaves, as well as a number of broken examples, that appear to belong to this species. They are of about the same size as the leaves in figs. 2 and 3 (loc. cit.) ; they have rather finer teeth, but otherwise do not differ essentially. Alnus sp. pi. xxvin, fig. 2 ; pi. xxxin, fig. 4. The collection contains two specimens that appear to represent the female catkins of an alder. They are well shown in the figures. Family ULMACEiE Ulmus braunii Heer. Ulmus braunii Heer, FI. Tert. Helv., vol. 11, p. 59, pi. lxxix, figs. 14-21, 1856.—Lesquereux, Cret. & Tert. FI., p. 161, pi. xxvii, figs. 1-4, 1883. I have some doubt as to the correctness of referring these leaves to Ulmus, but the examples in hand are not to be distinguished from cer- tain specimens from Spitzbergen and other localities that have been so referred by Heer,5 and I have thus regarded them. Family ACERACEAJ Acer trilobatum var. pj. XXIX, fig. 2. The collection contains several broken leaves of a maple, one of the best being figured. This appears to be one of the forms of the varia- ble A. trilobatum. It lacks the upper portion, and its position, there- fore, can not be definitely fixed. Family HIPPOCASTANACE.® ALsculus arctica sp. nov. pi. xxx. Leaflets of large size, coriaceous, obovate-lanceolate, rather abruptly rounded to an obtusely acuminate apex; margin entire below, finely 1 FI. Foss. Arct., vol. iv, Abth. 1, pi. xvi, figs. 5-8, 1876. 2 FI. Foss. Arct., vol. iv, Abth. 1, p. 75, pi. xvi, figs. 3, 4, 1876.