DEVELOPMENT OF THE SACCUS ENDOLYMPHATICUS 243 
ae a aire. —. 
6 L g. fac. g: ae | ap 
SEE : 
pt aa: 
Fig.6 Transverse section through the head ofa larva. (Stage IV.) Hypoph- 
ysis region. g.fac., ganglion faciale; g.trig., ganglion trigemini; hyp., hypoph- 
ysis; l.opt., lobi optici; s.e., saccus endolymphaticus. 
Fig.7 Transverse section through the head of the larva. (Stage V.) Posterior 
part ofmedullaoblongata. n.d.m., neurallamella of dura mater; p.d.m., periosteal 
lamella of dura mater; ¢.s.e., tubuli of saccus endolymphaticus; v.s., junction 
between neural and perisoteal lamellae of dura mater; v.sp.d., vena spinalis dor- 
salis duralis. 
