HERRING-FISHES. 
949 
is partly (somewhat more than half) divided within by an incomplete, 
horizontal septum, only the sac of the lower part being thus continuous 
with those of the other globules, while the upper part (the part nearest 
to the cranial cavity), which is pierced behind by a transversely-set, 
oblong aperture with a raised rim at the upper margin, is filled by an 
extension of the lymph-space surrounding the auditory apparatus. In 
the anterior part of the globule, however, this extension lies close to 
and above the said sac. The osseous wall of the lower posterior glo- 
bule ( gop ), on the other hand, forms a tubular prolongation backwards 
and downwards to a line with the middle of the occipital bone, where 
its inner sac is continued by a duct, with a more or less cartilaginous 
coating, that joins the anterior extremity of the air-bladder, though 
without free communication with the cavity thereof. All our attempts 
— like those of Valenciennes'* — to inject liquid either from the air- 
bladder to the said globule or in the reverse direction, have failed; 
but a fine bristle may be passed with ease from the auterior osseous 
globule ( goci ) and through the lower posterior (gop) into the duct and 
down to the wall of the air-bladder. 
vom 
fen 
B 
ei v 
vom 
nit 
gos- 
goci - 
■ - - gos 
ocl 
st 
ocb 
C 
Fig. 237. Skull of a Herring X 2. A from the left; B from below; C from behind. 
et , ethmoid bone; vom, vomer with its teeth; etl, lateral ethmoid bone; pcna, anterior nasal process of the ethmoidal cartilage; pcnp , posterior 
nasal process of the same; fr, fr, frontal bone; psp, psp , parasphenoid bone; obsp , orbitosphenoid bone; alsp, alispbenoid bone; sp/io , posterior 
frontal bone (os sphenoticum) ; ap, temporal aperture in front of the parietal bone; par, parietal bone; mt, mastoid or epiotic bone; ocs. 
squamosal part of the occipital bone; ocl, lateral part of the occipital bone; ocb, basilar part of the occipital bone; st, styloid, intercalary, 
or opisthotic bone; fv, foramen of the tenth cranial nerve (nervus vagus'); ftr, foramen of the fifth cranial nerve (nervus trigeminus)-, fen, 
labyrinthine fenestra; goci, auditory globule of the petrosal bone (globulus osseus anterior ); gos, auditory globule of the squamosal bone (glo- 
bulus osseus superior); gop, auditory globule of the occipital bone (globulus osseus posterior). 
Cuv., Val., Hist. Nat. Poiss., tome XX, p. 41. 
