TRIASSIC FISHES FROM SPITZBERGEN 
7 
The tooth P. 40 is of rather considerable size but is only preserved as an impression 
of the lateral side, which in its turn is incomplete and weathered (PI. 1, fig. 10). If it 
was developed symmetrically, its length may probably have been about 20 mm. 
The crown is bent in the same direction as that of the preceding tooth but not 
quite so much. The principal cone is sharply pointed but strikingly short in relation 
to the presumed length of the tooth. The lateral cones on the preserved end are 
relatively high and slender. They are six in number. With regard to sculpture the 
crown shows complete agreement with the typical teeth. The root is low, especially 
towards the ends, and is characterized in addition by its straight basal line. 
The tdoth just described bears a resemblance to the types distinguished by Jaekel 
under the name of Hybodus multiconus and H. multiplicatus and has probably been 
situated fairly far back. 
The tooth P. 633 (PL 1, fig. 9) is better preserved than the former one. Only the 
principal cone is broken off. But its medial side is fixed to the stone and it is therefore 
accessible for investigation chiefly from the lateral side. It is scarcely 9 mm long. 
Both the crown and the root are curved in the same way as in tooth 
P. 3 p a. The principal cone is short and inclined somewhat backwards. 
The lateral cones are small, bluntly shaped, and are four or five in 
number. The sculpture consists of relatively coarse and rather sparse 
striation as on the typical teeth. 
The root is low and very broad. The axis of height of the 
principal cone has a vertical position in relation to the basal surface. 
The tooth P. 633 shows in several respects an approach to 
Acrodus. The root clearly shows, however, that we are concerned 
with a Hybodus species. Owing to its elongated shape, the feeble 
development of the principal cone and the comparatively large number of lateral cones 
it resembles most closely tooth P.-40 and seems to have occupied a position similar to 
this or has probably been situated still farther backwards. 
Specimen P. 38 agrees rather well, as PI. 1, fig. 8 shows, with the type form, but 
the sculpture is very much more sparse and delicate. 
Of the teeth that I have included, with more ore less hesitation, under the name 
H. sasseniensis, the one from Horn Sound is, as I have mentioned, figured and described 
earlier (Stensio, 1918 b). The tooth from Salomon’s bone-bed (text fig. 2) is incompletely 
preserved, but appears to bear the closest correspondence in shape to Jaekel’s H. longiconus 
'type. The root and the crown both seem to be nearly straight. The lateral cones on 
the end that is preserved are comparatively low and blunt. The principal cone is only 
a little inclined backwards and medially. The sculpture of the crown consists of vertical 
striation as in the typical teeth, but the striae are more sparse and comparatively coarser. 
Remarks. — The types that have been grouped here in a common species — 
H. sasseniensis — show a, close resemblance to several of those that Jaekel, 1898 (p. 143) 
includes lender the name Parhybodus longiconus. In the Spitzbergen types, however, the 
lateral cones are generally lower and blunter and resemble more those of the H. cuspidatus 
Text fig. 2. 
H. sasseniensis n. sp. 
From bone-bed in the 
sandstone series below 
the fish horizon. Orig. 
belongs to W. Salomon, 
Heidelberg. 4/1. 
