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"Lingula flags" of Dolgelly, and Ffestiniog; N. Wales. Hymenocaris vermicauda, Salter. A phyllopod crustacean. Lingulella Davisii, M'Coy. a. One-half natural size. b. Olenus micrurus, Salter. Next below the Tremadoc slates in North Wales lie micaceous flagstones and slates, in which, in 1846, Mr.
It has been superseded by subsequent crosses between the sedeni itself and the Veitchi and rosiflora, the davisii, the clarkii and others. Each of them contributed its advantageous qualities, such as round flowers, rosy color, erect flower stalks, elevation of the flowers above the foliage and others.
This species is closely related to O. Bigelovii and O. Davisii. A prostrate, spreading plant, less than 1½ ft. high. Joints cylindrical, curved, 4 in. long, 1½ in. thick. Tubercles very prominent, longitudinally attached to the stem, the apices crowned with pea-shaped cushions of short bristles, and numerous radiating spines, some of which are fully 2 in. long, very strong and needle-like.
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