AUTHOR’S ABSTRACT OF THIS PAPHR ISSUED 
BY THE BIBLIOGRAPHIC SERVICE, MAY 1 
‘THE DEVELOPMENT OF THE GASTRIC GLANDS IN 
SQUALUS ACANTHIAS 
ADOLPH R. RINGOEN 
Department of Animal Biology, and the Institute of Anatomy, University of 
Minnesota 
SEVEN FIGURES (THREE PLATES) 
CONTENTS 
[rave oXe LOWOLYoy Neh VOM oe ire eerie es 3 i co en RA ARE es lo P-ReRe oP e dA Are UME Sn RM Eee 351 
Eerie BT CeNN Pe A eee ERCP rene ES cha rch etend ietbelba ay rece ECHR SEO ae RG Oe OT fs aya 352 
PORE CY INO Tis: Sh Bite 2 CES nd oc oss Qa eels mM, el ASE 2k a, 353 
A. Harly ehanges in the gastric epithelium... 2.0... 6..5...5.0200n0008 353 
Beehormsation ot dehnitersland snidiments:s..+48) neta. se eee ee 355 
C. Influence of the gland rudiment on the epithelium.................. 356 
D. Subsequent history of the gland rudiments......................005 307 
HP VOcat ONTO fCe lls wMberrs crite tear recs Aris aeciteusscegs's a atte reken ret omens ake edo 359 
F. Histology of the fully fumoriaeau SASULC CAN eee set ans fee 362 
Discussioniorresults anagiliserature lie 2602s ead AS aoe Ae ee 363 
SUIT aTaves Hs ear ¥o sean tenet scenes eyonyan stares, Macioiaiae’s oud wma S82 aap eee 368 
BT SISRe yea To RR ec ica Re eRe eve eae Sete CTP Ee en or ERI NE A a a ERNE NS 370 
INTRODUCTION 
The digestive tract of fishes, although the subject of a con- 
siderable amount of research, still affords opportunity for further 
study. The very early investigators of the subject were in- 
terested in its glands, but no serious attempts: were made to 
determine their origin and further differentiation. A study 
of the literature shows that there is still comparatively little 
written on the histogenesis of these structures. In view of these 
facts, the present paper attempts to elucidate the sequence of 
events that takes place in the development of the gastric glands 
as found in Squalus acanthias. 
The material used in this study was placed at my disposal 
by the Department of Anatomy, University of Minnesota. For 
the study of the glands, the stomach was removed from the 
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