HKIililNd-KlSIIES. 



94!) 



is partly (soiiiewliat more tlian lialf) divided within by an incomiilete, 

 horizontal septum, only tlie sac of the lower part being thus continuous 

 with tlicise (if (lie oilier globnles, while the upper part (the part nearest 

 til the cranial c-avi(y), wliich is pierced behind by a transversely-set, 

 oblong- a|uTturo with a raised rim at the upper margin, is filled by an 

 extension of the lymph-space surrounding the nndilory apparatus. In 

 the anterior part of the globule, however, this extension lies close to 

 snd above the said sae. The osseous wall of the lower posterior glo- 

 bule (.gop). on the other hand, forms a tubular prolongation backwards 



and downwards to a lino with the middle of the occipital bone, where 

 its inner sac is coTilinucd 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- 

 bladiler to the said globule or in the reverse direction, have failed ; 

 but a line bristle may be passed with ease from the anterior osseous 

 globule (</o(>) and through the lower posterior {gop) into the duct and 

 down to tlie wall of the air-bladder.. 



T If \ 



spho 



4- ^^ 



■ fUt^ 



ohsp alsp 



spho 



fen goj, 



Fig. 2.37. Skull of a Herring X 2. .1 from the left; B from below; C from beh 



H, ethmoid bone; com, vomer with its teeth; ell, lateral ethmoitl bone: pimt. anterior nasal process of the ethmoidal cartilage; /)oh/', posterior 

 nasal process of the same; /;•, ft; frontal bone; psp, psp, parasphenoid bone; obsp, orbitospheuoid bone; alsp, alisphecoid bone; splio, posterior 

 frontal bone (o.t 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 opisthotie bone; fv, foramen of the tenth cranial nerve (nerviis vagus); fir, foramen of the fifth cranial nerve (jiervtis trigeminus); fen, 

 labyrinthine fenestra; jo<i. auditory globule of the petrosal bone (globulus osseus anterior); gos, auditory globule of the squamosal bone (gh- 

 hiilus osseus superior); gop, auditory globule of the occipital bone {globulus osseus posterior). 



" Cuv., Vai,., Hist. Xat. Poiss., tome XX, p. 41. 



