Respiratory Appendages f ) 
g Nerve Supply 
Fic. 74.— VENTRAL HALF 
or HEAD-REGION oF AM- 
MOCETES. 
Ver 
a 
7 
red. Branchial and visce- 
ral muscles coloured blue. 
Tubular constrictor mus- 
cles distinguished from 
striated constrictor mus- 
cles by simple hatching. 
Tent., tentacles ; Tent. m.c., 
muco-cartilage of tenta- 
cles; Vel. m.c.. muco-car- 
tilage of the velum; Hy. 
m.c., muco-cartilage of the 
hyoid segment; Ps. br., 
pseudo-branchial groove ; 
Br. cart., branchial carti- 
lages; Sp., space between 
somatic and splanchnic 
muscles ; Th. op., orifice of 
thyroid; H., heart. 
