Szabó János szerk.: Fragmenta Mineralogica Et Palaentologica 26. 2008. (Budapest, 2008)
umbilicus with ridge around; aperture feebly prosocline and weakly oA r ate, axially elongate, its basal lip slightly thickened; most prominent ornament consists of sparse spiral carinae and collabral costae; fine, dense spiral lines cover whorls and base. Material — A single specimen, a fragmentary last whorl. M e a s u r c m e n t s H HL HP D W AA AL holotype **35 *25.8 *15.5 *31.5 Shape — Remnants indicate low spired sinistral shell of rapidly expanding, moderately convex whorls. Base slighdy convex and bears a narrow umbilicus with a ridge around. Broken surface obscurely shows infilling of axial hole, but umbilicus may be false. Aperture feebly prosocline, axially somewhat elongate, its columellar lip simple, basal lip slightly thickened externally. Trace of thickening visible around umbilicus on base. Sculpture — Sculpture consists of spiral carinae, three of them on whorls and three ones on base. Strength of basal carinae nearly equal, but peripheral and median ones much stronger than subsutural one of visible whorl surface, and basal ones. Sparse, collabral costae cross carinae from suture to edge of umbilicus. On peripheral and midwhorl carinae, presence of (spiny) nodes seems likely at crossing points. Dense, fine, uniform spiral lines cover shell surface (even carinae and costae). Growth-lines delicate, their shape feebly prosocline on whorls and slighly sigmoidal on base. Remarks — Scaevola? suissenseensis n. sp. is different both in shape and sculpture from Hamusina? hoernesi (STOLICZKA, 1861). Broken surface of the penultimate and preceding whorl suggest a much lower shell than that of Hamusina? hoernesi; the reconstructed spiral angle is about 30° wider in Scaevola? suissenseensis n. sp. Its peristome and the growth-lines on the whorls are much less prosocline than in Hamusina? hoernesi (compare Figure 81: C and F). Basal growth-lines are opisthocyrt in Hamusina? hoernesi but sigmoidal in Scaevola? suissenseensis n. sp. On the latter species, weaker and denser costae of the whorls continue to the periumbilical ridge, but terminate at peripher} 7 in Hamusina? hoernesi. The spiral carinae are lacking from the complete shell of Hamusina? hoernesi (STOLICZKA, 1861). Distribution — Schafberg over St. Wolfgang, (Austria), Upper Pliensbachian. Order Neritomorpha KOKEN, 1896 Superfamily Neritoidea GRAY, 1847 Family Ncritopsidae GRAY, 1847 Subfamily Neritopsinae GRAY, 1847 Genus Neritopsis GRATELOUP, 1832 Subgenus Neritopsis GRATELOUP, 1832 Type species: Neritopsis moniliformis GRATELOUP, 1832 Neritopsis (Neritopsis) elegantissima HÖRNES, 1853 (Figure 82) 1853: Neritopsis elegantissima I löRXl-S — HÖRNES, p. "63. 1861: Neritopsis elegantissima HÖRN MS — STOLICZKA, p. 179, pi. 111. fig. 7. 1982: Neritopsis (Neritopsis) elegantissima HÖRNLS, 1853 — SZABÓ, p. I 7 , pl. 1, figs 1-3. 1995: Neritopsis (Neritopsis) elegantissima HÖRNES, 1853 — CONTI & MON ARI, p. 205, pi. 2, figs 7-10. non 2002: Neritopsis (Neritopsis) elegantissima HÖRNES, 1853 — FISCHER et al., p. 448, Fig. 3: 9 a-c. Lectotype — GBa 2008/69/31/1 (selected here). Material — 260 specimens are more or less cleaned, but, because N. (N.) elegantissima is one of the most frequent gastropod species in the Hierlatz Alpe locality, lots of specimens are also on the rock pieces of other species. Measurements H HL HP lectotype 18.5 16.5 14 Shape — Shell low-spired, few-whorled and subglobose with canaliculate suture and broad, ovate aperture. Though completely undamaged protoconch not found, remnants suggest consisting of one and half whorl, following nucleus; shape similar to that of adult form. Adult peristome extends like trumpet, bearing only angulation at suture. Shallow furrow running parallel with narrowly callous inner lip, resulting also pseudoumbilicus. Sculpture — Protoconch smooth, teleoconch covered in beginning by spiral threads, strengthening into D W AA AL *16 *12 120° 120° cords of two kinds alternating each other on later growth stages. Onset of spiral ornament sudden, well marking end of protoconch. Strong A T arices and growth-threads crossing spiral elements collabrally. On juvenile shell part, varices rounded but becoming sharper and higher on subsequent shell regions. Generally, varices run from suture to suture, or to basal furrow. R e m a r k s — STOLICZKA's figure shows two kinds of varices alternating each other. This cannot be observed on the specimens but the strength, form and number in a
