298 ERIK A : SON STENSIO 
Fig. 5. Sassenia tuberculata n. sp., scales (P. 226). Exposed area of lateral surface. %. 
» 6. » » » » Ornament of a cheek plate (Pop, quj? on fig. 3) preserved as 
an impression in the stone (P. 226). 2 / 1 . 
Explanation of index letters. 
Co, coronoid (anterior and ventral part): Mptg, metapterygoid (posterior.part); Icor.pra, inter- 
coronoideo-prearticular (dorsal part); La. ju, lacrymo-jugal; Op, operculum; Pa.it, parieto-inter¬ 
temporal; Pco, precoronoid; Po, postorbital; Pop. quj? probably preoperculo-quadratojugal; Pt, ptery¬ 
goid; Sang, ang, supraangulo-angular, fragment; Sq. pop, squamoso-preopercular; Stemp. ext, supra- 
temporo-extrascapular; a, bone-plate situated in the interspace between the postorbital and oper¬ 
culum dorsally of the squamoso-preopercular; jc, jugal canal (in the squamoso-preopercular); jfc. 
infraorbital canal (in the lacrymojugal, where its posterior part is weathered away and marked 
by a shallow furrow). 
Plate 11. 
Axelia robusta n. sp., head (P. ig 5 ) seen from the right side. The external bones partly preserved 
as impressions of the outer surface, counterpart figured in plates 12 and i3. 
Explanation of index letters. 
Alsph, alisphenoid fused with and forming a long ventral process from the fronto-dermo- 
sphenotic; Br, ceratobranchial (in this figure represented by a fragment only); Chy, ceratohyal (in 
this figure only the posterior end is seen); De, dental (fragment); Ext, extrascapular plates; Fr. dsph, 
fronto-dermosphenotic; Id, clavicle (part of the ventral limb in this figure); Icor.pra, intercoronoideo- 
prearticular (in this figure only a dorsal part of the bone visible); Mptg, metapterygoid; Na. ant, nasalo- 
antorbital; Op, operculum; Pa. it, parieto-intertemporal; Pro. 0, prootico-opisthotic (in this figure 
only a postero-lateral part of the bone preserved); Pt, pterygoid; Ptr, postrostral; Qu, quadrate; 
Sang, ang, supraangulo-angular; Scl, supracleithral; Scr, sclerotic ring; Stemp. ext, supratemporo- 
extrascapular; e, basipterygoid process of the basisphenoid (here only a part of the distal end is seen); 
Ic, the cranial section of the lateral line in the supratemporo-extrascapular; naj and na 3 , nasal 
apertures; r. ophtli, furrow crossing the lateral side of the alisphenoid and indicating the course of 
the n. ophthalmicus lateralis; s. com, supratemporal commissure between the' cranial sections of the 
lateral line of the right and left sides. 
Plate 12. 
Axelia robusta n. sp., head (P. igS) from the right side. Counter part figured in PI. n. The external 
bones mainly preserved as impressions of the inner side. 
Explanation of index letters. 
Aang, autangular; Alsph, alisphenoid fused with and forming a long process from the fronto- 
dermosphenotic; Br, ceratobranchial; Chy, ceratohyal; Co, coronoid (fragment); Ext, extrascapular 
plates; Fr. dsph, fronto-dermosphenotic; Icl, clavicle (ventral part); Icor.pra, intercoronoideo-pre- 
articular; Mptg, metapterygoid; Na. ant, nasalo-antorbital; Op, operculum (impression of inner side); 
Pa. it, parieto-intertemporal; Pethm, preethmoid; Pro. 0, prootico-opisthotic (only a small part 
visible); Pt, pterygoid; Ptr, postrostral; R, rostral-plates; Scl, supracleithral; Scr, sclerotic ring; 
Sscap, suprascapular; Stemp. ext, supratemporo-extrascapular; e, basipterygoid process of the 
basisphenoid; lat. for, foramen on the preethmoid for vessels and nerve branches to the extremity 
of the snout (branches of r. maxillaris trigemini and n. buccalis lateralis); Ms, furrow along the ventral 
border of the lateral surface of the preethmoid for vessels and nerves (r. maxillaris trigemini and 
n. buccalis lateralis); naj, anterior nasal aperture; 5. com, supratemporal cross-commissure between the 
cranial sections of the lateral lines. 
