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FIELDIANA
Geology
NEW SERIES, NO. 26
Comparative Microscopic Dental Anatomy in the
Petalodontida (Chondrichthyes, Elasmobranchii)
Rainer Zangerl
H. Frank Winter
Michael C. Hansen
March 31, 1993
Publication 1445
PUBLISHED BY FIELD MUSEUM OF NATURAL HISTORY
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Croat, B. 1978. Flora ofBarro ColoradoIsland. Stanford University Press, Stanford, Calif., 943pp.
Grubb, P.J.,J. R. Lloyd,andT.D. Pennington. 1963.Acomparison ofmontaneand lowland rain forest inEcuador.
I.The forest structure, physiognomy, and floristics. Journal ofEcology, 51:567-601.
Langdon, E.J. M. 1979. Yage amongtheSiona: Cultural patterns invisions,pp. 63-80.In Browman, D. L.,and R.A.
Schwarz, eds., Spirits, Shamans, and Stars. Mouton Publishers,The Hague, Netherlands.
Murra, J. 1946. The historic tribes of Ecuador, pp. 785-821. In Steward, J. H., ed., Handbook ofSouth American
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Geology
NEW SERIES, NO. 26 W~-
Comparative Microscopic Dental Anatomy in the
Petalodontida (Chondrichthyes, Elasmobranchii)
Rainer Zangerl
CuratorEmeritus
DepartmentofGeology
FieldMuseum ofNaturalHistory
Chicago, Illinois60605-2496
H. Frank Winter
SchoolofDentalMedicine
Washington University
St. Louis, Missouri63110
Michael C. Hansen
Ohio GeologicalSurvey
Columbus, Ohio 43224
Accepted March 13, 1992
Published March 31, 1993
Publication 1445
PUBLISHED BY FIELD MUSEUM OF NATURAL HISTORY
© 1993 Field Museum ofNatural History
ISSN 0096-2651
PRINTED IN THE UNITED STATES OFAMERICA
