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ERIK A : SON STENSIO 
logical characters. The most striking of these is the cranial skeleton, which is, as a 
rule, more robustly and coarsely built, a fact which in its turn is of course due to the 
nature and strength of the dentition. 
The sculpture of the scales of Axelia resembles in certain respects that of 
Heptanema. Both genera also agree in the strong development of the sensory canals 
(Reis, 1888, pp. 64—66), but whether a close relationship existed between them it is 
still impossible to say. A strongly developed system of sensory canals is also found, 
as we know, in Libys (Reis, 1888, p. 50). 
Axelia is named after my brother Axel Stensio, Pharm. Cand., who, as mentioned 
in the introduction, has participated in two Spitzbergen expeditions and has also been 
one of my patrons. 
Axelia robusta n. sp. 
Pis. II —15; PI. 16, figs. 1—5). 
A. robusta is represented by a considerable number of remains (P. 187 — ig3, P. 195, 
P. 214, P. 222, P. 227 — 23 i, P. 233 — 236, P. 708). — It is not quite comparable with 
Alspli, alisphenoid joined to and forming a ventro-caudal process from the fronto-dermosphenotic; Bsph, basisphenoid; Fr. dsph, 
fronto-dermosphenotic; Na. ant, nasalo-antorbital; Pa.it, parieto-intertemporal; Pethm, preethmoid; Pspk, parasphenoid; Ptr, post- 
rostral; R, rostrals. So, supraorbitals; Stemp. ext, supratemporo-extrascapular; at, forward pointing lamella from the basisphenoid 
corpus: e, basipterygoid process ;/<?«, fenestration in the interorbital wall corresponding to the entrance to the supposed myodome; 
lat.for, foramen for the most anterior branches of n. buccalis lateralis and n. maxillaris trig.; ms, groove for n. buccalis lateralis 
and n. maxillaris trigemini along the lateral side of the preethmoid; na x , anterior nasal aperture; na v posterior nasal aperture; 
p, pores of the supraorbital canal; r. ophth, furrow on the lateral side of the alisphenoid indicating the course of n. ophthalmicus 
lateralis; v, ventral process from the basisphenoid corpus; II, for. opticum; III, for. oculomotorii; IV, for. trochlearis; V',e, outer 
opening of the canal for n. ophthalmicus profundus; V 2 , 3 , place of exit for r. mandibularis, r. maxillaris and n. ophthalmicus trige¬ 
mini and n. ophthalmicus lateralis. 
W. sinuosa in size. The largest and at the same time best preserved head (P.195) is about 18 cm 
long; the greatest height of this head is about 11 cm and the breadth, measured on the 
cranial roof over the posterior part of the orbitotemporal region, is about 5-5 cm. With 
regard to the general proportions of the body in other respects no details are known. 
The following description of the skeleton of the head is based on the specimens 
P. 187, P. 189, P. 190, P. 193 and P. 199. 
