Y 
< 
a 
= 
H 
= 
ES 
< 
> 
< 
mM 
=) 
AH 
—ÁÚ 
= 
© 
mM 
z 
Lanni 
= 
E 
SYSTE 
NEAL: NERVOUS 
Taste IIL— NEUROMERES I TO XI IN SQUALUS, AND THEIR RELATIONS TO NERVES, SOMITES, 
AND VISCERAL ARCHES. 
CEPHALIC METAMERES. 
NEUROMERES 
vı [vi |vm | IX 
Somites . 
| Nerves (dorsal) 
Nerves (ventral) 
Visceral clefts 
\ Visceral arches 
x 
a 
| 
| 
Be 
(VD) (VD 
| | 
mouth 
8 
natassa ee aa es ee 
9 
Possibly also representing a visceral pouch. 
Fuses with the dorsal ganglion of X in later stages. 
Represented by ganglia which probably disappear in development. 
Form the first three roots of the embryonie hypoglossus nerve. 
Found in Hexanchus, Heptanchus, and Chlamydoselachus. 
> Possibly represented in the two labial cartilages. 
Roman numerals bracketed indicate the theoretical nerve relationships. 
