Vörös A. szerk.: Fragmenta Mineralogica Et Palaentologica 14. 1989. (Budapest, 1989)

Neritopsis dumortieri sp. n. Plate I: 12-13. 1869. Neritopsis hebertana d'Orbigny - DU MORTIER, p. 135, pl XXXV, fig. 5-7. 1886. Neritopsis spinosa Hebert et Deslongchamps - VACEK, S. 107, Taf. XVIII. Fig. 6. 71899 . Neritopsis spinosa Heb. et Desl. - GRECO, p. 124, tav. IX, fig. 18-20. Holotype

: 1886/5/59 - Name : after the first representative of the species - Type lo cality

: Capo San Vigilio - Type strata: San Vigilio Limestone Formation - Diagnosis : medium sized shell with three spiral carinae on last whorl, uppermost one delimiting narrow ramp; rare collabral ribs, bearing long, hollow spines at crossing points with carinae; additional ornament of spiral threads and lines. Material

: a damaged, shelly specimen (1886/5/59). Measure ments: H HL HA D W A 11 - 13+ - . 21++ + on basis of spine ++ on top of spine Description : The given specimen is a medium sized, subglobose one. Its juvenile part is damaged but the adult characters are well visible. Three uniform spiral carinae are present on the last whorl; one delimiting a narrow, moderately convex ramp, another corresponds to the periphery and the lowermost one runs in the middle of the base. The most prominen transverse ornamental elements are the sparse collabral ribs, similar to the carinae in strength. Long, hollow spines with slit along their full length are sitting at the crossing points of the carinae and the costae. Spiral threads and intersecting lines cover the whole shell, and even the spines. Remarks : This species was originally identified as Neritopsis spinosa Hebert and Deslongchamps by VACEK. Though under the name N. spinosa HEBERT and DESLONGCHAMPS (I860) depicted three forms, we could not find only one, really similar to the San Vigilio specimen. Certainly, the great variability, suggested by the figures was why the authors of the above synonym-list used the name N. spinosa. Only the specimen in Fig. 5b has long spines like N. dumortieri sp. n., but the number of carinae is four, and the peripherial one does not bear spines at all; specimens in Figs. 5a, c-d have three carinae, but their shape is significantly different, as well as that of the specimen in Fig. 5b; they are more depressed than N. dumortieri sp. n., and they have a circular whorl cross-section and aperture, while these are ovate in N. dumortieri sp. n. Only this latter one has a definite, almost flat ramp. DU MORTIER named has find N. hebertana d'Orbigny, but this name covered a species with four carinae, dense collabral ribs and only nodes at the crossing points of the mentioned ornamental elements. The figured specimen agrees both in shape and ornament to the San Vigilio specimen. The N. "spinosa" specimens, depicted by GRECO (1899), seem to belong also to N. dumortier

i sp. n., but their preservation is rather bad. From the spiny Neritopsis species group, the Bajocian N. spiniger

a Szabó, 19 82 is the nearest one in age to N. dumortieri sp. n. but it has only one row of spines at the lower rim of the ramp. Order C A E N O G A S T R O P O D A Cox, 1959 Superfamily Xenophoracea Deshayes, 1864 Family LA ME LLIPHORIDAE Korobkov, 1955 Genus Lamelliphorus Cossmann, 1915 Lamelliphorus supraliasinus (Vacek, 1886) Plate III: 1-10 1886. Onustus supraliasinus n. sp. - VACEK, S. 108, Taf. XVIII, Fig. 14-16.