UTRECHT MICROPALEONTOLOGICAL BUllETINS

conodonts" and the "complex conodonts". Lindstrom (1964, p. 91 etc.)
already showed a later development from the "complex conodonts" towards
the "platform conodonts".
Regional occurrence: At Kopingsklint this species is found in member K k 2
and K k 3' In section 6 it occurs from member K ii - d 1 up to and including the
basal portion of member K k3 . Near Horns Udde it was found from member
K k2 up to the top of member K k3 .
Biostratigraphic range: Prioniodus deltatus was found from the Prioniodus
deltatus Assemblage Zone up to and including the Oistodus lanceolatus/
Prioniodusdeltatus Assemblage Zone (fig. 15).
If the assumption is correct, that Prioniodus deltatus gradually transformed
into Prioniodus navis, there must be a hiatus in our present knowledge
of the regional ranges of both species in the area. The latter appears
from fig. 15, which shows a gap between the last occurrence of Prioniodus
deltatus and the appearance of Prioniodus navis.
Further information about the actual ranges of Prioniodus deltatus and
Prioniodus navis may have important consequences for the conodontzonation
of the area (see chapters 11.2.4.13 to 11.2.4.16).
Prioniodus elegans PANDER, emend. VAN WAMEL, herein
(PI. 6, figs. 1-6)
Prioniodus elegans PANDER, 1856, p. 29, PI. 2, figs. 22, 23, PI. 3, fig. 9. LINDSTROM, 1955a, p.
589, PI. 5, figs. 26-29; Fig. 5a.
Prioniodus elegans PANDER, (pars), emend. LINDSTROM, 1971, p. 51.
Belodus gracilis PANDER, 1856, (pars), PI. 3, fig. 8, not p. 30, PI. 2, fig. 21.
Gothodus costulatus LINDSTROM, 1955a, p. 569, Pi. 5, figs. 23-25.
Prioniodus carinatus PANDER, 1856, PI. 3, fig. 7, not p. 30, PI. 2, fig. 25.
Falodus prodentatus (GRAVES & ELLISON). LINDSTROM, 1955a, p. 569, PI. 5, figs. 21, 22, 30; not
Oistodusprodentatus GRAVES & ELLISON, 1941, p. 13, PI. 2, figs. 16, 22, 23,28.
Remarks:Nothing needs to be added to Pander's and Lindstrom's descriptions
of the prioniodiform element (see PI. 6, fig. 1).
The prioniodinaform element was illustrated by Pander (1856) in his PI. 3,
fig. 9 and he called it Prioniodus elegans. Pander's PI. 3, fig. 8 shows a similar
prioniodinaform element, which in this case he refers to Belodus gracilis, a
species defined by a holotype illustrated in his PI. 2, fig. 21. It appears,
however, that this holotype can not be included in our multi-element species
Prioniodus elegans.
The prioniodinaform element (PI. 6, fig. 2) has a robust and proclined
cusp, with well rounded sides and sharp anterior and posterior edges. Only
the anterior part of the posterior process is preserved in the figured specimen.
It is straight and crowded with subequal denticles, which are almost