Volume LX. September, 1SQ4. . Number 3. 
JOURNAL 
OF 
MOR HOROG Y. 
OBSERVATIONS ON THE GEMMULE AND EGG 
DEVELOPMENT OF MARINE SPONGES. 
HENRY V. WILSON.! 
TABLE OF CONTENTS. 
PaGE 
SVN ZTE © TUG IT ONG Gest sca baci se cece see cee en so eae etre s E ve ee eae oe ee rs are 27 
I. ADULT STRUCTURE AND GEMMULE DEVELOPMENT OF ESPERELLA 
FIBREXILIS, N. SP. 
Voy PANGDO UU DAD ps foo cco ges angoc oe coe es ee ew Sv eid skvac sc ou'ones sohsseg cinencas wer scensae daeeyeeet acne 279 
LGUCO TY OLOLLCOL, LVLCL LOU Sense eat tee eee cee ee eee ee . 285 
2. FORMATION OF GEMMULES.....-0.2-2..c:0-:cccesccceneecsencececesecerscnencestesueerends 287 
3: DEVELOPMENT OF GEMMULE INTO SWIMMING LARVA.............. 294 
Ao WIR PAMO RIB ETO SUS aes ses te eecghe reece peace eb eaes reece ee ee eee oe 298 
LE CLOG ET ITEN ase ess Re ee wee oe en ae ee et 301 
ISUOCETINGL CUULELES. CH  COMGAIS cases nen cpcteneens ses2se.ce0aseceereesceeeticeeee . 305 
DOVE UCN Mer TAA AAT TER OT PO TEES PR PER NaI ET ERAT 307 
LG EV ENE COMGUS LI OSCULO sates sasnevesutns seen yaststen: sestaeueecereeeeee sees .. 308 
AU EV CTE CONGUS ATLA POT CS i este ey eee et teee saens eee ees . 309 
LU ORCUALER CRATILOCE Siisutcsses i501 savstens states teesisuss orsueeeacaetene sete eens 310 
MD ECULES 2 sete gee Nake BD cote ON he Zonet toes, Sat de eee eee tae Meee 314 
Summary of the leading facts in the gemmule development of 
SLY SDOTELLG % Mame ects oak Misa tewae tte e Seep cee tsee oi eee nese eae ed eee 315 
Previous knowledge of the development of Esperia (Esperella).. 316 
1 Published by permission of Hon. Marshall McDonald, U.S. Commissioner of 
Fish and Fisheries. 
