1250 



DR. ERIK A. STENSIO : NOTES 



Primordial Nei(rocranium. 



The general shape of the primordial neurocranium is almost as 

 in Z>^j»focerc^(:Zes (Stensiij, 1922 a). The degree of ossification is, 

 however, evidently much less than in this. 



''=|The basioccipital and the paired lateral occipital described by- 

 Bryant are both rather thin, and it seems very probable, under 



Text -figure 3. 



Dictyonostens arctictis Stensio. 



The anterior part of the cranial roof. Sensory canals with dotted lines 



and shading. From P. 355. 1/2. 



Ant], anterior antorbital element; Ant^, posterior antorhital element; DspJi, 



dermosphenotic (dermal postfrontal) ; Fr, frontal ; Ir, interrostral ; Wai-Naz, 



nasal elements; Fmx, premaxillary ; Ftri, anterior postrostral element; JPtr^, 



posterior postrostal element; JE, rostrals; So, supraorbitals; na, external nasal 



aperture; orh, orbita; y, accessory bone-plate. 



the presumption that Bryant's text-fig. 56 is correct, that they 

 did not directly bound either the chorda, which certainly 

 extended into the basis cranii for some distance, or the cranial 



