TRIASSIC FISHES FROM SPITZBERGEN 
2 55 
Perleidits as well ought probably to be included among the Catopterids. Provisionally 
one might also possibly incorporate Meridensia with them. On the other hand I do not 
think it probable that Nephrotus belongs here. 
The geological occurrence and geographical distribution of the 
Catopterids. 
The family Catopteridae, even in the more extensive definition given to it by me, 
is known exclusively from the Triassic. 
In spite of this rather short life from a geological point of view its representa¬ 
tives attained a very extensive geographical distribution. The genus Catopterus is thus 
known from the east of the United States (Woodward, 1895b, pp. 1— 3 ; Eastman, 1904, 
p. 95; 1911, p. 47; 1914a, p. i 3 g; 1917, pp. 279—281), Dictyopyge from the east of the 
United States, Ireland, England, Germany, Switzerland, Eastern Australia and South 
Africa (cf. Woodward, 1895b, pp. 4— 9; Eastman, 1904, p. 95; 19x1, p. 47; 1914a, p. i 3 g; 
Broom, 1909a, pp. 257—258 and p. 262), Perleidus from Northern Italy (de Allessandri, 
1910, pp. 49—51) and now as for as one can judge from Spitzbergen as well, Colobodus 
s', str. from France, Germany, Northern Italy, Switzerland 1 ) (Woodward, 1895b, pp. 68—77; 
Andersson, 1916 a, pp. 18—25; Stolley, 1920, pp. 38 —45, 75 — 86), Dollopterus from Ger¬ 
many (Stoli,ey, 1920, pp. 45 — 68) and finally Meridensia from Northern Italy (Andersson, 
1916 a, pp. 25—29). 
The Occurrence of Perleidus in the Triassic of Spitzbergen is of great interest as 
showing that, as I pointed out above (p. 85) we may expect to find additional forms that 
are related to those from the Alpine Triassic. 
Description of the Spitzbergen material. 
Genus Perleids de Allessandri. 
Synonyms: Semionotus (in part), Deecice, 1889, Colobodus (in part), Woodward, A. S. 1912. 
As already mentioned above, de Allessandri in 1910 established the g'enus Perleidus 
for a fish described by Deecice in 1888 (pp. 120—121) under the name of Semionotus alto- 
lepis. The type specimen, which belongs to the Senckenbergian Museum at Frankfurt 
am Main, was until recently the only specimen known. During a visit to the Sencken¬ 
bergian Museum in the autumn of 1919, I was able to discover, however, that a second 
specimen of the same species was present in the material of Lombard Triassic fishes 
described by Deecke, : although up to that time this specimen had been looked upon 
as belonging to Heterolepidotus pectoralis Belotti (Senckenberg Museum, P. 1258). 2 ) In 
addition a critical examination of the figures in de Allessandri’s monograph (1910) on 
the Triassic fishes of Lombardy suggests that it is not impossible that two more spe- 
J ) A doubtful species, C . sibiricus , is described from Sibiria and another similar one, C . africanus , from 
Africa (Woodward, 1895 b, p. 76; Traquair, Quart, Journal. Geol. Soc. vol. 66. London 1910, pp.'249—251). 
2 ) According to a note on the label of this fish already de A1.LESSANDRI has had a suspicion that this spe¬ 
cimen might be identical with Perleidus altolepis . 
