5° 
ERIK A : SON STENSIO 
Scler acanthus, come from Spitzbergen. A sixth new genus is probably represented in 
Redakteur Konig’s collection from the Muschelkalk at Heidelberg, and in this connection 
it is worthy of mention that the Coelacanthids apparently played a greater part in the 
Central European continental Triassic than was earlier thought to be the case. Agassiz 
(1844, vol. II, part 2, p. 173) has given Coelacantlius minor for the Muschelkalk and 
C. gracilis may also possibly come from the same formation. Berger (i 832 ) describes 
as pointed out above in the historical chapter, a Coelacanthid fish from the Keuper in 
the neighbourhood of Coburg, and Reis mentions (1888, p. 6) a number of Coelacanthid 
fragments from different horizons of the German Triassic. In various German museums 
which I had the opportunity of visiting I also found a number of more or less frag- 
mentarily preserved remains of Coelacanthids from this formation. Thus the Stuttgart 
museum has a piece of a ceratohyoid ossification labelled Ceratodus sp. from the Keuper; 
the Senckenberg museum in Frankfurt am Main has an isolated urohyal from the 
Muschelkalk at Bayreuth and the Berlin museum two jugular plates from the Muschel¬ 
kalk. Besides these specimens there are in the possession of Redakteur Konig remains 
of a couple of pieces from the Muschelkalk at Heidelberg and two more, from this 
locality, belong to the Palaeontological Institute at Upsala. As to the specimens in 
Redakteur Konig’s collection it is obvious that they have been of considerable size, as 
is also certainly the case with one of the Upsala specimens. 
As I shall show below it is also of great interest to find how the three genera 
Axelia, Mylacanthus and Scler acanthus appear to be more specialized in certain respects 
than other known Coelacanthid forms. 
In Europe Triassic Coelacanthids are found in Germany, France, Austria (Reis, 
1900), Hungary (Jaekel, 1911b, pp. 20—21), Switzerland (Andersson, 1916 a, loc. cit.), 
Italy (de Alessandri, 1910, loc. cit.). At Spitzbergen they are also found and seem there 
to be especially common. Furthermore a species is known from the east of the United 
States (Eastman, 1911, loc. cit.), another from South Africa (Broom, 1909 b, p. 253) and 
a third is described from Canada (Lambe, 1916, pp. 38 — 3 g) from deposits whose Triassic 
age can, however, be scarcely considered as having been clearly shown. 
In the Jurassic too the Coelacanthids seem to have been somewhat common. In 
this formation there appear the genera Undina (Reis,' 1888; Woodward, 1890b; 1891b; 
Eastman, 1914b, p. 358), Heptanema (Reis, 1888; Woodward, 1891b), Libys (Reis, 1888; 
Woodward, 1891 b) and Coccoderma (Reis, 1888; Woodward, 1891 b) with altogether more than 
ten species. With the exception of Undina gulo (Egerton) and U. barroviensis. A.S. Woodward, 
which both occur in the English Lias, and Coccoderma substriolatum (Huxley) which is de¬ 
scribed from the Kimmeridge clay, also from England, they are limited to the lithographic 
stone of South Germany, France and Spain (Vidal, 1915, p. 33 ). In addition Woodward 
(1895 a, pp. 3 —4) has described remains of an undeterminable form from Australia, and 
from material belonging to the Palaeontological Museum of Christiania it is evident that 
the Coelacanthids were also present in the Jurassic of Spitzbergen. It is even probable 
that in the latter case we are concerned with a previously unknown genus. 
From the Cretaceous there are described only the two genera Macropoma (Reis, 
1888; Woodward, 1891b) and Mamsonia (Woodward, 1907a; 1908b), the former from 
England and Bohemia, the latter from the district of Bahia in Brazil. A fragment of 
