UTRECHT MICROPALEONTOLOGICAL BUllETINS

in member Ka- d 1 and Ka- d 2 of section 6. Reworked material has been
encountered in the basal portion of member Kk3 at Kopingsklint as well as
near Horns Udde.
Biostratigraphic range: Prioniodus elegans was found from the Prioniodus
elegans/Oelandodus elongatus Assemblage Zone up to and including the
Protopanderodus rectus/Oelandodus costatus Assemblage Zone (fig. 15).
Prioniodus navis LINDSTROM, emend. VAN WAMEL, herein
(PI. 8, figs. 10-19).
Prioniodus navis LINDSTROM, 1955a, p. 590, PI. 5, figs. 31-35.
Baltoniodus navis (LINDSTROM), emend. LINDSTROM, 1971, p. 56, PI. 1, fig. 13, not PI. 1, figs.
18-23.
Prioniodina densa LINDSTROM, 1955a, p. 586, PI. 6, fig. 20.
Prioniodus triangularis LINDSTROM, 1955a, p. 591, PI. 5, fig. 46, not PI. 5, fig. 45.
Baltoniodus triangularis (LINDSTROM), emend. LINDSTROM, 1971, p. 55, PI. 1, fig. 12.
Tetraprioniodus denticulatus LINDSTROM, 1955a, p. 596, PI. 5, fig. 44.
Trapezognathus quadrangulum I;INDSTROM, 1955a, p. 598, PI. 5, figs. 38~41.
Gothodus costulatus LINDSTROM, pars, emend. LINDSTROM, 1971, p. 54, PI. 1, figs. 1,2,3, not PI.
1, figs. 4, 5.
Trichonodella longa LINDSTROM, 1955a, p. 600, PI. 6, figs. 47, 48.
Oistodus linguatus extenuatus LINDSTROM, 1955a, p. 578, PI. 3, fig. 42.
Remarks: This multi-element species comprises elements that are either
sporadically or well denticulated. Contrary to the denticle-like modifications
on some elements of Prioniodus deltatus (LINDSTROM), emend. herein (PI.
8, figs. 1-9) the denticles of Prioniodus. navis are·distinct tooth-like structures,
wh,ich are never fused completely. All elements have been described
,earlier as separate form species.
The prioniodiform element (PI. 8, figs. 10, 11) is Prioniodus navis
LINDSTROM, 1955. To this form species belong well denticulated forms
and others with occasional denticles, as follows from the illustrations which
accompany the original description. The sporadically denticulated forms (PI.
8, fig. 10) seem to take an intermediate position between forms called
Acodus deltatus LINDSTROM, 1955 and those called Prioniodus navis
LINDSTROM, 1955.
The prioniodinaform element is Prioniodina densa LINDSTROM, 1955
(PI. 8, fig. 12), which may be sporadically denticulated in the older faunas.
Prioniodus triangularis LINDSTROM, 1955, is the gothodiform element
(PI. 8, figs. 13, 14). In fact, it is not quite comparable with the form genus
Gothodus LINDSTROM as it sometimes carries denticles on its anterior edge
(process). But on the other hand, it is not a real Prioniodus either, because
the lateral edge (process) is undenticulated and there are no real free
processes.