1204 



SCANDINAVIAN flSHES. 



tally directed tube, utricKlns {k), \\liicli dilates aiiteriorly 

 iiito a vesicular l)ull), )-('cessi(f: utrkuli (rcc), in whose 

 anterioi- and outer sides open two vesicular tubes, the 

 anterior (aa) and the external (ae) amjmUtB, continued 

 each by a narrower, tubiforin duct, the anterior {ca) 

 and the external {ce) semieircular canals, Avhich bend 



round and at their other end again open into the utri- 

 culus, the former at the U])i>er end of an upward in- 

 vagination thereof, .s/»/m.s ntricidi superior (ss), tlie latter 

 into the lower part of it. At the posterior termination 

 of the utriculus, sinus ntricidi posterior (sp), opens a 

 third vesicular tube, the posterior ampulla (ap), which 



Fig. 3<")2. Auditory (.r.tcan of Ujc rislit Hidu; A, iu n Percli (I'erca t/iiviatih'.t; X 3, sec-ii fruui witliin); B, in a Sturgeon {Acipenaer sturio; 



X 3',2, seen from without); 6', in a Cliimcera {Chimicra vionstrosa: X 3' j, seen fronj within); D, in a Roiirjh Hoxmd (Scylliorhimis cani- 



ailri : X 3l..,), and E, in a Mud-eel (/SVrc" laceftina; X 11'.,), botli the last seen from witliin. 



((«, ampulla anterior 



ae, ,. externa 



aji, ,, posterior 



ac, iiervus aeustieus 



iide. apertnra externa ductus endolyin])lintiei 



adp, ,, ductus perilymphatii i 



ass, apex sinus .superioris 



c, cutis 



ca, canalis anterior 



ce, ,, externus 



cp, „ posterior 



cr, crista acustica anipuUaruni 



ors, canalis recessu-saccularis 



cus, canalis utriculo-saceularis 



de, ductus endolymphaticus 



dcp, ductus canalis posterioris 



dji. ,, perilympliaticus 



/, lagena cochlea' 



vin, macula acustica ueglecta 



»K«, ,. ,, sacculi 



mu, „ „ recessus utriculi 



0, otolites (in the recessus utriculi, sacculus 



and lagena) 

 pi, papilla acustica lagena' 

 raa, raniulus ampulla' anterioris 

 rae, ., ,, externa' 



rap, raniulus ampulhe posterioris 



rl, ,, lagen.'e 



rn, ., neglectus 



/•s, „ sacculi 



ru, „ recessus utriculi 



rec, recessus utriculi 



s, sacculus 



$e, saccus endolymphaticus 



sp, sinus utriculi posterior 



ss, ,, ,. superior 



sg, squamse cutis 



II, utriculus. 



