TRIASSIC FISHES FROM SPITZBERGEN 
4 3 
between the second and the third (Stromer and Peyer, 1917). In addition it is worthy 
of note with regard to the former groove that it extends farther medially and is deeper 
than the others. 
The medial surface of the most anterior ridge faces also much dorsally, which, 
according to Peyer (1917, p. 54), is one of the more constant characters by which the 
teeth of the mandibles differ from those of the palatines. Text 
fig. 18 shows the different ridges in transverse section and this 
figure, like PI. 3, fig. 19 a as well, indicates that a pulp cavity 
P— P4) was developed under every ridge. 
The masticatory surface has the «narbenahnlichen» depressions, 
often found in the Ceratodus teeth. Nothing is preserved of the 
enamel. On the medial border, just in front of the angulus internus, 
can be seen a small facette ( a, PI. 3, figs. 19 b—d), with which 
the tooth came into contact with that of the opposite side. 
Concentric lines of growth are clearly seen on the part of the tooth that extends 
downwards and covers the inner side of the so-called splenial ventrally of the medial 
and caudal borders (PI. 3, figs; 19 b—d); on the transverse section a similar striation 
can also be distinguished (text fig. 18). 
Remarks. — The tooth described here seems in all respects to agree closely 
with the correspondingly situated teeth of C. sturii and C. kaupii. It is not possible as 
yet to decide whether it represents a distinct species or is identical with either of the 
two species mentioned. 
Geological occurrence and locality. •— The Ceratodus tooth P. S^o was 
found in the bone-bed of the lower Saurian horizon at Mt Viking (Mt Hamilton). 
' P 5 Po \ c , 
Spl 
Text fig. 18. Ceratodus n.sp. 
Section through tooth. 2 / 3 . 
Spl , so-called splenial; p,—p„, 
the pulp cavities of the different 
ridges. 
Order Crossopterygii. 
Family Coelacanthidae. 
Historical. 
In G. Mantell’s work, «The fossils of the South Downs* (p. 23g), published in 1822, 
we probably find the first description and reproduction of the remains of a Coelacanthid fish 
under the name of Amia? lewesiensis. In 1829 Sedgwick (p. 118) mentions and figures a Coela¬ 
canthid form under the indefinite term «Fossil fish*, and another one, also unnamed, 
is described three years later by Berger (i 832, p. 18). In 1834 Munster (p. 539) introduces 
the generic name Undina for a species from the white Jurassic of Bavaria; in 1835 we 
find Amia? lewesiensis of Mantell under the generic name Macropoma r ) in Agassiz’s 
«Feuilleton», to his «Recherches» (Feuilleton additionnel p. 55), and the year afterwards, 
also in the «Feuilleton» (i836, p. 83), the generic name Coelacanthus is used for the first 
time. It was not until 1844 (vol. II, part 2, pp. 168—180), however, that Agassiz published 
0 The name Macropoma is already used by Agassiz 1*833 («Recherches», vol. II, part. 1, p. 2.), but there 
is no statement to the effect that this name refers to the so-called Amia? lewesiensis (see Woodward and Sherborne, 
Catalogue of British Fossil Vertebrata, p. XXV). 
6* 
