UNIVERSITY OF CALIFORNIA PUBLICATIONS 
IN 
ZOOLOGY 
Vol. 9, No. 2, pp. 85-104, pls. 10-12 December 28, 1911 
ON A LYMPHOID STRUCTURE LYING 
OVER THE MYELENCEPHALON 
OF LEPISOSTEUS 
BY 
ASA C, CHANDLER 
CONTENTS 
PAGE 
DiraijeOrOXGN ECORI TROY, pesca de ReaP as Eee os oe sob 8h eRe Rees ce eee ce or pa Se Sree eee Ree Sees 85 
Occurrence and homologies -............................-- tects finar PEP pence rear aan 87 
VD GCYONET ILA rn see ee 87 
Absence in other Ganoids .................. 2 So seenasauuascewsescekeessa2 87 
Possible homology with ‘‘Saccus endolymphaticus’’ in Protopterus 88 
Gamera mOnphOlO iyig ee cee eeccsesete su scectcceeescseeseec cect sonstce dno sssaeateeeace=secesseretoe= 88 
DETER S THO 0 sy faeces eee scene teas ese c bab wn gen Suuk casn eect chs A eesus daeeaacbesyauees Sues sgetcuncsctaedencsbseuse 90 
NEVE] OY CM eeetee ee cee eae ae sere aces cence cas wayen eee se Un ce use e oes cos onan et awed cheeeaakecuessee 93 
Nis) TENS | SUES) Sores seeaneeccere peenebesseecastCneraaes -aereet eee eee Seeenteathns sbeexeerseseee 93 
SI) TANT EYEQ) ancpteso sectors tees preres be eeeene Maer ct CREE Dee c oe tec Pe eee ee Re RESO 94 
SUVHCVUCTE Oe eeeereeeeecaes RCO cena er ea ee ar ee 95 
MUA OM ANT NCU O CS aaa cece cee cs an Seer asa dee so oe acd as eau ts cee nseers /eceseacnsee sc acsadsueensesancntiee 97 
INTRODUCTION 
The present paper is a preliminary report on a peculiar 
eland-like, lymphoid strueture discovered over the myelence- 
phalon of Lepisosteus while dissecting out the brain in the labor- 
atory of Professor B. G. Wilder, at Cornell University, during 
the fall of 1910. The work was begun in Cornell University 
during the college year 1910-11, and later carried on in the 
Zoological Laboratory at the University of California. 
Grateful acknowledgments are here made to Professors C. A. 
Kofoid and J. Frank Daniel, of the University of California, 
