the ramulus ampulle externez, which extends to the external ampulla; 
the ramulus recessus utriculi, which extends to the recessus utriculi. The 
ramus posterior gives off a heavy branch, the ramulus sacculi, which ex- 
tends to the sacculus. The rest of the ramus posterior divides into the 
ramulus lagenze, which extends to the lagena; and the ramulus ampulla 
posterioris, which extends to the posterior ampulla. Another branch, the 
ramulus neglectus, which is normally given off where the ramus pos- 
terior divides into the ramulus ampulla posterioris and ramulus lagene, 
has not been identified. 
The normal fish ear has seven auditory spots—the macula acusticus 
recessus utriculi, three crist2e acusticus ampullarum, macula acusticus 
cacculi, papilla acusticus lagenw, and the macula acusticus neglecta, In 
Amblyopsis all of these auditory spots are present: 
PAPERS CONSULTED. 
Ayres, Howard, 1892. ‘Vertebrate Cephalogenesis.” ‘A Contribution to 
the Morphology of the Vertebrate Ear, with a Reconsideration of Its 
Functions,” Journal of Morphology, Vol. 6, p. 1. 
Lee, Frederic S., 1898. “The Functions of the Ear and the Lateral Line 
in Fishes,’ American Journal of Physiology, Vol. 1, No. 1. 
Kreidl, Alois, 1895. ‘Ueber die Perception der Schallwellen bei den 
Fischen,”’ Archiv fiir die Gesammte Physiologie. Vol. 61, p. 450. 
Retzius, Gustaf, 1881. ‘Das Gehiérogan der Wirbelthiere.” 
EXPLANATION OF FIGURES. 
The lettering is uniform throughout and in the main that used by 
Retzius in “Das Gehérorgan der Wirbelthiere.” 
ca—Canalis .anterior. 
ce—Canalis externus. 
cp—Canalis posterior. 
s—Sacculus. 
u—Utriculus. 
rec—Recessus utriculi. 
ss—Sinus utriculi superior. 
cus—Canalis utriculo-saccularis. 
]—Lagena. 
