ON CERTAIN CEOSSOPTERYGIANS. 1255 



mutually and between these and the bones in front are more 

 correct in Bryant's text-fig. 2 a than in the restoration pub- 

 lished by me in 1921 (Stensto, 1921, text-fig. 57)*. 



Between the anterior end of the intertemporal and the postero- 

 lateral corner of the frontal there is in my specimens a very 

 distinct small dermosphenotic {Dsph, text-fig. 4), and I also find 

 from pi. V. fig. 2 and pi. iii, fig. 2 in Bryant's paper that the 



Text-figure 4. 



Eustheno]pferon fordii Whiteaves. 



.Dermal cranial roof. After a specimen belonging to the Palseontological Institution, 

 TJpsala. The sensory canals marked with dotted contours and shading. 1/1. 



Ant, antorbital; Dsph, dermosphenotic; Ext, lateral extrascapular; U.vt.m, 

 median extrascapular ; ^r, frontal ; J#, intertemporal; ia, lacrymal; JJa;, maxil- 

 lary; Na, nasal; Pa, parietal; Fmx, premaxillary ; P^r, postrostral ; i2, rostrals 

 ^nd interrostrals ; So, supraorbital ; Stemp, supratemporal ; ifc, infraorbital sensorj' 

 canal; Ic, cephalic portion of the main lateral line; mp, groove indicating the 

 position of the middle head line of pit organs ; na, external nasal aperture ; orb, 

 orbital entrance ; pPi groove indicating tlie position of the posterior head line of pit 

 organs; soc, supraorbital sensory canal. 



same bone was an independent element in the specimens investi- 

 gated by him. Its exact position and relation to the sensory 

 canals is shown in text-fig. 4 and in my restoration published in 

 1921 (Stensio, 1921, text-fig. 57), and will be further dealt with 

 below in the account of the sensory canal system. 



The frontal in Bryant's restorations thus has a too large 

 extension postero-laterally. The pineal foramen between the 

 two frontals is not distinct in my specimens, though I can 



* This was due to the fact that my restoration was made after a specimen 

 •showing the inner surfaces of the bones. 



83* 



