. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. Note: Differs from the type variety in possessing a pentagonal basal ring. The specimens from the Eocene of Western Siberia are analogous to the form described from the Early Eocene of Mors Island^ Denmark (Schulz, , Figure 41a). The specimens from the Neogene of the Far East are smaller (length of side of basal ring, 8— 10 /n) and have a thinner skeleton. 251 Var. aculeata Lemm. (Plate XV, 10; Figure 23, 1). Lemmermann (1901), Ber. Dtsch. bot. Ges. 19, 1, p. 261, Table 11, Figures 1-2; Gemeinhardt (1930), Silicofl.
. Cryptogamic plants of the USSR. (Flora sporovykh rastenii SSSR). Plants. Note: Differs from the type variety in possessing a pentagonal basal ring. The specimens from the Eocene of Western Siberia are analogous to the form described from the Early Eocene of Mors Island^ Denmark (Schulz, , Figure 41a). The specimens from the Neogene of the Far East are smaller (length of side of basal ring, 8— 10 /n) and have a thinner skeleton. 251 Var. aculeata Lemm. (Plate XV, 10; Figure 23, 1). Lemmermann (1901), Ber. Dtsch. bot. Ges. 19, 1, p. 261, Table 11, Figures 1-2; Gemeinhardt (1930), Silicofl. In: Rabenhorst's 10, p. 55, Figures 43a, b; Gemeinhardt (1931), Deutsche Sudpolar-Exp. 20, p. 237, Table 42, Figures 13, 14; Gemeinhardt (1934), Wiss. Ergebn. deutsch. Atlant. Exp. "Meteor," 12, 1, 3, p. 291, Figures 123, 124, Table 7, Figures 10-12. Basal ring is almost square with slightly convex sides, 19 —23 /i long, and almost uniform radial horns, 7 — 9 pt long. One accessory spine is present in the middle of each basal, lateral and apical rod. Distribution in the USSR: Pacific Ocean near the south coast of Kamchatka, Recent bottom deposits; Bering Sea, Sea of Okhotsk. General distribution: Atlantic Ocean in the region of warm currents and in the equatorial zone. Note: The form encountered off the south coast of Kamchatka resembles the specimen from the South Equatorial current as illustrated in Gemein- hardt (1930, Figure 10a), although it is FIGURE 23. Disuibution of Di ct yocha fibula Ehr. var. aculeata Lemm. and var. messanensis (Hack.) Lemm. in seas of the USSR; 1 — var. aculeata; 2 —var. messanensis. Var. messanensis (Hack.) Lemm. (Plate XV, 8; Figure 23,2). Lemmermann (1901), Ber. Dtsch. bot. Ges. 19, p. 261; Lemmermann (1903), Nord. Plankton, 2, Lief, 2, Figure 94; Gemeinhardt (1930), Silicofl. In: Rabenhorst's 10, p. 51, Figure 41a; Gemeinhardt 269. Please note that these images are extracted from scanned page
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