1262 DK. ERIK A. STENSIO : NoxES 



An account of tlie exact bomologues of the basipterygoid 

 process of the Coelacantbicls is given by me in connection witb 

 tbe description of the niyodome of Saurichthys (Stensio, 1922 fc), 

 and on tbe same occasion I also bad tbe opportunity of deabng 

 with the myodome of tbe Ccelacantbids. As it will perhaps be 

 a long time befoi'e I can get enough money to print my work on 

 the Sauriehtbyids, I have found it necessary to give here in 

 extenso the considerations that I made there on the Ccelacantbids. 



"In tbe Ccelacantbids (Stensio, 192L pp. 53-62, 91-96, 120- 

 122; 1922 «, pp. 177-184, 205-206) there has taken place, in 

 connection with the considerable growth of the eyes, a compression 

 and thinning from the sides of certain postero-ventral parts of 

 the orbito -temporal region and an adjacent smaller part of tbe 



Text-figure 6. 



Scs -Pa.it Sph j:^^ 



ch •' .' ', \ ■ ' V "Psph 



It mv) fen S a.car.inV 



Diplocercides kayseri (V. Koeiien). 



Median sagittal section tlirough the neurocranium. Cartilaginous parts restored. 

 Cartilage dotted, cartilnge bone shaded. 2/1. 



Fr, frontal part of the dermal cranial roof; 01, occipito-labyrinth ossification; 

 J?a.it, parieto-interteniporal ; Tsv^h parasphenoid ; Spit, sphenoid ; a.car.int, 

 unpaired canal for the internal carotid arteries; 5o, basioccipital portion of the 

 ocoipito-labj'rinth ossification ; ch, chorda space; c«, cranial cavitj' ; /ew, anterior 

 division of the mj'odorne ; fJiyp, fossa hypophyseos; my, posterior division of the 

 niyodome ; s, canal between the fossa hypophyseos and the myodome ; so, supra- 

 occipital portion of the occipito-labyrinth ossification. 



labyrinth region. These thinned partsha,vea latber considerable 

 fenestration close to tbe base of tbe primordial neurocranium, 

 the oibits thus being in communication with each other at this 

 place. The fenestration, tbe ventral boundary of which is formed 

 by the parasphenoid, is situated A^entrally of tbe fossa hypo- 

 physeos, with which it has presumably communicated, and just 

 posterior to tbe impaired canal for the arteria? carotides internee, 

 that ascends veitically through the basis cranii, entering the 

 cranial cavity immediately anterior to the fossa hypophyseos. 



