FIGURES 



ABBREVIATIONS 



A, A 1 , A 2 , arrows in figure 8 to show 

 the probable direction of transmis- 

 sion of hydrostatic pressure from the 

 outside to anterior membranous 

 vesicle 



AO, aorta 



AOC, anterior osseous capsule 



ASCA, ampulla of anterior semicircu- 

 lar canal 



ASCL, ampulla of lateral semicircular 

 canal 



ASP, alisphenoid bone 



AV, anterior membranous vesicle 



BAOC, bone of anterior osseous cap- 

 sule 



BR, brain 



BSO, basioccipital bone 



CA, crista acustica in ampulla of the 

 anterior semicircular canal 



CC, cartilage of the canal of the swim- 

 bladder diverticulum 



CI, inferior chamber of anterior osseous 

 capsule 



COC, cartilaginous otic capsule 



CS, superior chamber of anterior osse- 

 ous capsule 



CSD, canal of the swimb ladder diver- 

 ticulum in the cranium 



E, eye 



EMV, Epithelium of the membranous 



vesicle of the swimbladder 

 EPO, epiotic bone 

 EXO, exoccipital bone 



F, fenestra 



FB, fusiform bulla of the pre-coelomic 

 diverticulum of the swimbladder 



LC, lateral-line canal 



LF, lip of the swimbladder of the 



fenestra 

 LR, lateral recess of the skull 

 MA A, anterior division of macula 



acustica utriculi 

 MAM, middle division of the macula 



acustica utriculi 

 MAP, posterior division of the macula 



acustica utriculi 

 MD, medulla 

 M V, embryonic membranous vesicle of 



precoelomic diverticulum 

 NAM, nerve of the anterior division of 



the macula acustica utriculi 

 NPM, nerve to the posterior division of 



the macula acustica utriculi 

 OM, otolithic membrane 

 P, periosteal lining of the anterior 



osseous capsule continued on the 



surface of the septum 

 POC, posterior osseous capsule 

 PRO, prootic bone 

 PSB, precoelomic diverticulum of the 



swimbladder 

 PSC, supracerebral perilabyrinthine 



canal 

 PSCL, branch of supracerebral peri- 

 labyrinthine canal which connects 



with the perilabyrinthine spaces of 



the lateral recess 

 PSCM, branch of the supracerebral 



perilabyrinthine canal which opens 



medially to the sacculus 

 PV, posterior membranous vesicle 

 RU, recessus utriculi 



243 



