TRIASSIC FISHES FROM SPITZBERGEN 
23 5 
fins had a row of fulcra. The unjointed lepidotrichia have a sculpture of fine longitudinal 
striae of ganoine, while the other were probably without any ganoine covering. — 
Finally it ought also to be added that the joints of the lepidotrichia preserved are 
considerably longer than broad. 
Squa. mation. 
The squamation is very incompletely known, only the middle scales in the 18—20 
vertical rows behind the shoulder girdle being preserved (PI. 3 o, fig. 1). The scales in 
general seem to have been rather thin. 
As far as can be decided, in a few vertical rows immediately behind the shoulder 
girdle there were scales that were higher than wide. The majority of the scales present, 
however, show the opposite condition, i. e. their width is greater than the height. 
The sculpture consists of fine striation. The striae are of two sorts: partly such 
as traverse the exposed surface of the scales right from the anterior to the posterior 
margin, and partly such as are short and fine, only occurring along the posterior 
margin. The former kind of striae, which are relatively fine and rather uniformly 
narrow, occur in small numbers on each scale, and the intervals between them are 
consequently very wide (PI. 3 o, fig. 2). Another characteristic of them is that they pass 
off nearly parallel to the upper and lower margins and are not situated more or less 
diagonally or with their anterior parts bent upward as in Acrorhabdus bertili. The other 
type of striae, which is found along the posterior margin, occurs on all the scales present. 
As shown by PL 3 o, fig. 2, they are short and fine. 
Remarks. — Acrorhabdus asplundi is well separated from A. bertilli especially 
by the different development of the scale sculpture. Additional differences between them 
consist in the shape of the operculum, the number of the basally unjointed lepidotrichia 
in the pectoral fins and the conditons of the sculpture on the lepidotrichia of these fins. 
This species is named after my friend Docent Dr. Erik Asplund, who took part in 
the Spitzbergen expeditions of igi 3 and 1915. 
Geological occurrence and locality. — Acrorhabdus asplundi was 
found in the fish horizon at Mt Andersson. 
Acrorhabdus latistriatus, n. sp. 
(PI. 29, fig. 4; PI. 3o, figs. 3—5). 
The material present of this species consists only of an incomplete specimen (P. 170), 
considerably smaller than the previously described specimens of Acrorhabdus bertili and 
Acrorhabdus asplundi. Apart from this fact no details can be established as to the general 
shape and proportions of the species. 
Visceral skeleton. 
The maxillary (Mr, PL 29, fig. 4) and mandible \Md, Pl. 29, fig. 4) are both very 
incompletely preserved, and it is therefore impossible to observe much about their 
shape. The mouth was large and extended far back, as in the two preceding species. 
3o* 
