88 
ERIK A : SON STENSIO 
continues forward and downward for a good way. On the posterior limb the relation 
between the tooth-bearing and toothless parts is about the same as in W. sinuosa. In 
addition it is noteworthy that in the more blunted teeth on the pterygoid I found an 
indication of a small, verruciform apex, which causes these teeth to resemble rather 
closely certain of those in Mawsonia gigas (Woodward, 1907 a, p. 135; Pl. 8, fig. 4 b). 
Text fig. 37. 
Sassenia tuberculata n. sp. 
Cross-section through the head 
at about the boundary between 
the labyrinth and orbitotem¬ 
poral regions. From P.22 6. */ 2 . 
Bsph, basisphenoid; G, jugular 
plate; Icor.pra, intercoronoi- 
deo-prearticular; Br, cerato- 
branchials; Chy, ceratohyal 
ossification ; Pro. o, prootico- 
opisthotic; Psph, parasphe- 
noid; Pl, pterygoid; Uhy, 
Sensory canals of the head. 
The sensory canals seem to be well developed, but our know¬ 
ledge of them is still very incomplete. Only the part of the infra¬ 
orbital canal that lies in the posterior and middle part of the 
lacrymo-jugal (jfc, Pl. 10, fig. 3 ) and a postero-ventral part of the 
jugal canal (text fig. 35; jc Pl. 10, fig. 1) near to the lower margin 
of the squamoso-preopercular are present. No pores are observed. 
Squamation. 
The scales are strikingly large in relation to the animals’ 
dimensions. Their shape is purely oval and both the anterior and 
the posterior margins are well rounded. The covered part seems 
as a rule to be large compared with the exposed part. The sculp¬ 
ture consists of small tubercles situated close together and small, 
fairly parallel, longitudinal striae (Pl. 10, figs. 2, 5). Generally there 
Text fig. 38. Sassenia tuberculata n. sp. 
A. lacrymo-jugal from P. 226; 
B. Coronoid from P. 226 ; 
C. Ceratohyal ossification from P. 226. 
D. Epihyal ossification from P. 226. 
All the figures in the size ?/ s . 
are striae dorsally, ventrally and anteriorly on the ex¬ 
posed surface, while the tubercles are more or less 
restricted to the middle and posterior part of the same 
surface. Irregularities in this respect are, however, not 
infrequent. As I have already pointed out in the 
general description of the genus Sassenia, the sculpture 
of the scales in this species resembles in character 
that of the species from the Cava Trefontane at 
Tessin described by me as Undina sp. As I have 
also mentioned above, it shows in the same respect 
considerable similarities to Undina gnlo too. 
Geological occurrence and localities. — S. tuberculata occurs rather infrequently 
in the fish horizon and has so far been found only at Sticky Keep, Mt Trident and 
Mt Andersson. 
Sassenia? guttata (A. S. Woodward). 
Synonym: Coelacanthus guttatus WoodWard, A. S., Upsala Geol. Inst. Bull. II, 1912. 
The species is represented only by the type specimen (P. 219). 
I have only the following facts to add to the description given by Woodward, 1912 
(pp. 291—292). The pterygoid has the posterior limb rather narrow; otherwise its shape 
