Vörös A. szerk.: Fragmenta Mineralogica Et Palaentologica 12. 1985. (Budapest, 1985)
Description: Medium-sized perisphinctid, with 82 mm maximal preserved diameter, where other measurements are: 23 (28%); 29 (35%); 43 (52%). The coiling is extremely evolute, with wide and shallow umbilicus, convex umbilical wall and flanks, and rounded, broad venter. The ribbing consists of very strong, widely-spaced radial or slightly projected primary ribs, which branch into low, rounded secondaries near to the ventrolateral margin. The last whorl bears 20 primary ribs, and each primary gives rise to 4 secondaries. The inner whorl shows different ribbing, i.e. the innermost preserved whorl has dense strong radial inner ribs. The change in the ribbing style appears abruptly, at ca. 15 mm umbilical diameter. One of the most characteristic features of the species is the presence of strong, deep and wide constrictions parallel to the primary ribs, where the whorl-thickness suddenly grows considerably. Each whorl shows 3 constrictions. Suture line cannot be seen, and the end of the phragmocone cannot be distinguished. Remarks : The stratigraphie distribution of this species has been recently discussed elsewhere (see GALÁCZ 1980, p. 129), and this proved that C. (S.) uriniacensis is a Middle Bathonian, Subcontractus Zone form. The recent record from Spain (SANDOVAL 1983) refers to a slightly different ammonite showing weaker ribbing and shallower constrictions. This species was first recorded from Sicily (Monte Inici) by ARKELL (1954, p. 279; 1956, p. 208), then WENDT (1963, p. 83) mentioned it from Monte Bonifato. Family Morphoceratidae Hyatt, 1900 Genus Morphoceras Douvillé, 1880 Morphoceras multiforme ARKELL, 1951 (Plate II, Fig. 4) 1951. Morphoceras multiforme nom, nov. — ARKELL, p. 17. 1955. Morphoceras multiforme ARKELL — ARKELL, p. 132, pi. 16, figs 1-2; text-figs. 47, 50 ( cum syn. ) 1970. Morphoceras multiforme ARKELL — HAHN, p. 33, pi. 5, figs. 1-5; text-fig. 7. (cum sy n.) Description: The available single specimen is a badly preserved fragment of a ca. 25 mm diameter example, which shows some of the diagnostic features clearly. It is wholly septate, the umbilicus is narrow, with steep umbilical wall, abrupt umbilical edge. The whorl-sides are convergent, the venter cannot be seen. The fine, rounded ribs arise on the umbilical margin, projected on the inner part of the flank and become radial toward the venter. The characteristic narrow, strongly projected constrictions cut the ribbing in the typical Morphoceratid style. Suture lines are not visible. Remarks : The species was discussed recently in detail in several monographs (ARKELL 1951-59, MANGOLD 1970, HAHN 1970). Its stratigraphie range is restricted to the lower part of the Zigzag Zone (see TORRENS 1971). Morphoceratids were first recorded from Sicily by ARKELL (1954, p. 279). WENDT (1963,, p. 81) found similar faunas. Family Tulitidae Buckman, 1921 Genus Rugiferites Buckman, 1921 Rugiferites (Rugiferites) n. sp., aff. R. (R.) polypleurus (BUCKMAN) (Plate II, Fig. 1) aff. 1921-1923. Pleurophorites polypleurus nov. — BUCKMAN, p. 47, pi. 371. aff. 1971. Tulites (Rugiferites) polypleurus (S.BUCKMAN) — HAHN, pl. 3, fig, 6. (cum syn .) Description : A single, fragmentary, incomplete specimen. The maximal diameter is ca. 72 mm, the measurements at 60 mm diameter are: 25 (42%); c. 42 (c. 70%); 18 (30%). The coiling is evolute for the genus, the umbilicus is deep, with slightly convex umbilical wall; the flanks and the venter are rounded. The ribbing is dense, with 39 primary ribs arising at the umbilical seam. The primaries are radial on the umbilical wall, then become prorsiradiate on the umbilical margin. The secondary ribbing appears higher up on the flanks, the secondaries are low, nearly flattened, and curve backward to cross the venter perpendicularly. On the body chamber the secondary ribbing becomes slightly rursiradiate. Generally the secondary/primary rib ratio is 2,0, but some ribs trifurcate, while certain primaries are continuous up to the venter. The strength of the primary ribs varies, i.e. there are some thicker, stronger ribs ending in bulks at the furcation point. The
