'L'RIASSIC FISHES FROM SPITZBERGF.X 
53 
Wimania sinuosa n. sp. 
(Pis. 4, 5, 6, 7 and PI. 8, fig. 1.) , 
Synonym: Leiodenna sinuata, Stensio, Eriic A : Son, Upsala, Geol. Inst., Bull. vol. 1 
So far as can be seen, Wimania sinuosa is with 
certainty represented only by three incomplete 
specimens (P. 257, P. 255, P. 677). The best preserved 
one of these "(P. 257) consists of a head with some 
scattered scales. Of the two other specimens only 
some remains of scales and a few fragmentary 
lepidotrichs (dermal fin-rays) are preserved. The 
head mentioned (P.257) measures about 20cm in 
length, with the opercular apparatus included, and 
its greatest height is about 10 cm. The following- 
description of the cranial skeleton is based entirely 
on this specimen. 
The primordial neurocranium and its ossi¬ 
fications. 
The primordial neurocranium is on the whole 
(text figs. 19, 20, 21) rather high and relatively narrow- 
in comparison with its length. The ethmoidal region 
is wide and low and of average length. The orbito¬ 
temporal region, on the other hand, is specially 
distinguished by its great length. In its anterior and 
middle parts it has been narrower than both the 
ethmoidal and the labyrinth region. Its middle part 
at least formed ventrally a rather thin interorbital 
v r all and it is strongly open to question wfiether at 
one place this was not even fenestrated, as I shall 
try to explain later on. In the most posterior part 
the orbitotemporal region is wdde and passes wfithout 
any very decided boundary into the labyrinth region, 
wdiich is of moderate length. The latter region in¬ 
creases rapidly in width posteriorly and probably 
passes in its turn rapidly into the occipital region, 
which, as far as one can judge, must have been 
rather short (text fig. 21). 
In profile the dorsal contour line of the prim¬ 
ordial neurocranium probably corresponded approxi¬ 
mately to that of the dermal bones. In the labyrinth 
region and the posterior part of the orbitotemporal 
region it has consequently been fairly horizontal. 
Along by far the greater part of the orbitotemporal and the whole of 'the ethmoidal 
region, on the other hand, it slopes forward. The snout has probably been fairly low- 
Text fig. 20. Wimania sinuosa n. sp. 
The neurocranium from the dorsal side with 
the cranial roof removed above the occipital 
region, the labyrinth region, and the posterior 
part of the orbitotemporal region. From specimen 
P. 25~. */,. 
Alsph, alisphenoid, joined to and forming a 
ventrocaudal process irom the fronto-dermo- 
sphenotic; Bsph, basisphenoid; Fr. dspl i, fronto- 
dermosphenotic; Na. ant, nasalo'-antorbital; 
Pro. o, prootico-opisthotic; Psph, parasphenoid; 
Plr, postrostral; So, supraorbitals; pi, forward 
pointing lamella from the basisphenoid-corpus; 
c, posterior process from the prootico-opisthotic; 
e, basipterygoid process;/,, dorsal process from 
the corpus of the prootico-opisthotic; lab. car, 
cavity in the posterior part of the prootico- 
opisthetic, probably enclosing an anteriorportion 
of the labyrinth; m, the opening of the myodome 
a-,, sulcus for n. facialis; v, ventral process from 
the basisphenoid; V 2 , 3 , see the explanation of 
the preceding figure. 
