Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 63. (Budapest 1971)
Nagy, I. Z.: Lower Cretaceous Cephalopods from the Mts. Bakony, Hungary
Description: In cross section wider than high; ratios: 18:16, 21:19, 21:20, 21:19. Ribs with two lateral and two ventral tubercles. No interstitial ribs present. Remarks: Ribs connecting tubercles double; those passing over the dorsal side are partly obsolescent partly weakened: these latter emerge from the dorsal tubercles. Lobes L and U comparatively wide, deeply indented, lobe U of an asymmetric character. Occurrence: England (mainly from the substauderi and dispar zones); France (Vraconnian); Switzerland (Vraconnian); Sardinia, Tunisia, Nigeria (uppermost Albian); Madagascar, India, Texas (Weno-Formation = substauderi zone). Anisoceras armatum (J. SOWERBY) (Table I, Fig. 9; Table II, Figs. 1-3) 1817. Hamites armatus J. Sow., p. 153, pi. 168. 1861. Anisoceras pseudelegans PICTET & CAMP., pi. 50, fig. 8. 1868. Anisoceras armatum (J. Sow.) — RENZ, p. 75, pi. 15, fig. la—c, 3a—c; text figs. 37d, 28a. Examined material: 12 specimens, chiefly fragments of the living chamber. Localités: Pénzeskút, K 15 K„; Bakonynána, B, P, C; Nagyesztergál, W; Tés, M; Jásd, Z. Description: Whorl cross section oval, ratios: 19:15, 22:20, 24:20. One or two robust secondary ribs decurrent between tubercular ribs (doubled between tubercles). Remarks: The tubercles of the main ribs had originally been sharp spines, as still well visible on the specimen M. 70.888. The multiplication of the dorsal ribs —and concurrently also their weakening —is especially well discernible on the living chamber of the larger specimens. The structure of the lobe system is rather fragmentary, but still well identifiable with RENZ'S (1968) drawing "a" of Fig. 28, p. 77. Occurrence: England (substauderi and dispar zones); Switzerland (Vraconnian); Spain, Africa, India, Texas (Clark, Weno, Paw-paw Formations). Two specimens may also be relegated to the formenkreis of this species (Bakonynána, B, P). Both are the incurved, uncinate ends of the living chamber. On these, the interstitial ribs appear in irregular alteration: 2, 3, or none. Owing to the bad state of preservation nothing more can be established, beyond they fitting formally into the frames of the species armatum. Anisoceras pieteti SPATH (Table I, Fig. 10) 1861. Anisoceras armatus (Sow.)— PICTET & CAMP., p. 62, pi. 48, figs. 1, 2, 4, 6. 1926. Anisoceras pieteti SPATH, p. 432. 1968. Anisoceras pieteti SPATH— RENZ, p. 76, pl. 13, figs. 8a— c, 9a— b; pi. 14, figs. 6a— c, 7a— c, 9a— c; pi. 15, figs. 4a—c; text fig. 27c, 28f. Examined material : Fragments of 6 specimens from the localities Bakonynána, K, P; Pénzeskút, K v Description: Whorl cross section nearly circular, ratios: 17:16, 11:11. The two ventral and two dorsal tubercles situated on robust, doubled ribs. Interstitial rib also strongly developed. Coiling of shell divergent from the planispiral.
