THE CEREBRAL GANGLIA OF THE EMBRYO OF RANA 
PIPIENS 
F. L. LANDACRE anp MARIE F. McLELLAN 
From the Zoological Laboratory of the Ohio State University 
ELEVEN FIGURES 
CONTENTS 
NGO CUT LTO Tp rete se ee eet ae Rosi Ot Sow sean AE ASL OA Apette ieee oe ee ae 461 
IMIGSI RIEL oie exc ta BS Cnet SURE ERR EE RTE I PMB nH IRE Pe Maan Lia NE 462 
he GRICeMITIO-fACTAMCOMPLOX A. 2 sca.ae 2-2 2c < be eee ee ee ee 462 
hewalocsopharyngealzanpuon2. 455 .2.2 <0: <2 ad Sbarro AAG een ate ee 464 
Pe emt: UlTS LEN sere MERON EN soy coke Scat aie oA. doo SCN ee ees oe Soe 466 
TM OVS GA IIS bree OVA Re a cto xc, eee PR IM RTS CHES ena om nbc eRaus AOE e ee ot 467 
MpneRCOTsalelia bara lis exe cctt. cries cla exse isis > one tale aera a a so 468 
iewventralelaterallis Neos: ese Qe tcp crates ach paren Seis eee ee I orton ee 470 
sreneenenralysomatley kes (KUcUlan)y vance ae ees aoe a ese eee eee 472 
Sip osce COMO VIS CORalist ket 202 5..hce Ae oar etn Lyne aes Seems ol Maa ie Moet 473 
Branchialis X, or first visceralis X....... roan Set Gc ee SE nh eR ie 475 
SUMMIT ALY. Ana tdis CUSSTOM 5 sres ect he ee Ee AT7 
POE R CUT CACLLEC 152 a seeps sakes es reeked teraeree SeCAS 481 
INTRODUCTION 
A description of the cerebral ganglia of the frog embryo is 
undertaken as a preliminary to the study of the mode of origin of 
these ganglia. 
This might seem superfluous in view of Strong’s (’95) excellent 
work on the same subject but Strong’s work was pioneer in nature 
and since it was published there have appeared a number of excel- 
lent papers on the cerebral nerves and ganglia in Amphibia. 
particularly those of Coghill (02) and Norris (’08) in addition 
to numerous papers on other Ichthyopsida. While most of these 
papers confirm in general the analysis established by Strong, 
particularly for the composition of the trigemino-facial complex. 
there are certain features in the composition of the glossopharyngo- 
461 
