TRIASSIC FISHES FROM SPITZBERGEN 
39 
Remarks. — Palaeobates polaris is well separated by the sculpture of its teeth 
from both P. angnstissimus and P. balatonicus Jaekel (1911b). Both these species have a 
far more copious formation of anastomoses between the striae, the result of which is 
that the whole sculpture of the crown gets a reticulated appearance, which is not the 
case in P. polaris. It is true that a longitudinal crista also occurs, according to my 
observations, in a number of teeth belonging to P. angustissimus , but it is not found 
regularly as in P. polaris; P. balatonicus is still too incompletely known in this respect to 
be compared with the two species mentioned. 
Geological occurrence and locality. — P. polaris is only known with certainty 
from the fish horizon, where it is rather rare. The two present examples come from 
Mt Andersson. 
Palaeobates n. sp. 
(PL 1, figs. 28, 29.) 
I have grouped here provisionally four teeth (P. 96, P. 97 and two teeth from 
Horn Sound, belonging to the Palaeontological Collection of the University of Christiania). 
Two of these are accessible for investigation only from the lateral side (P. 97 and one 
of those from Horn Sound). Of the two others one (P.96) is present only as an im¬ 
pression of the lateral side. The other is so embedded in the stone that only the root 
is discernible. 
In spite of a considerable difference in size the tooth P. 97 and one of the teeth 
from Horn Sound are developed very similarly. The former is 8-5 mm and 2*5 mm 
respectively in length and maximum height, the tooth from Horn Sound 3 ‘5 mm and 
i*5 mm respectively. They are both bent so that the masticatory surface is convex 
from one end to another and the base of the root is concave in the same direction 
(PL 1, figs. 28, 29). This curvature is not symmetrical, but is stronger towards one end, 
as in the majority of the teeth described above in P. polaris, and at this place the 
crown has a distinct, blunt principal cone. This cone is most strongly developed on 
the tooth from Horn Sound (PL 1, fig. 29). 
The crown of the two teeth first mentioned has a more prominent longitudinal 
crista than in P. polaris. The striae issuing from it are very much ramified and anastomose 
with each other with their branches, forming in this way a close network. The surface 
of the crown consequently gets pitted as in P. angustissimus and P. balatonicus. It is 
also noteworthy that the striation or, more correctly speaking, the network of striae, 
at least on the medial side is not developed nearest to the basal margin of the crown, 
but that close to this there is a narrow sculptureless region. 
The tooth P. 96 has no indications of any cone on the crown, and with regard to 
its shape it seems to have resembled most closely the teeth in row b of the mandibula 
of P. polaris. The sculpture of the crown is not preserved. 
The remaining tooth from Horn Sound has an elongated shape. Its state of 
preservation does not permit of any detailed description. 
