Okada 69 Orto 



a. Developmental mechanism of entoderm differentiation. Triturus pyrrho- 

 gaster and Hynobiiis nebulosus (Urodela) 



b. Role of the yolk mass in early morphogenetic movement, Triturus pyrrho- 

 gaster and Hynobius nebulosus (Urodela) 



c. Regional differences of induced structure. 



OKAZAKI. Miss K. — Embryol. Section, Dept of Biol.. Fac, of Sci., Tokyo 

 Metropolitan Univ., Meguro-ku, TOKYO, Japan, 

 a. Metamorphosis of partial larvae. Peronella (Clypeastroidea, Echinoidea) 

 h. A study of skeleton formation. (Echinodermata) 

 OKSCHE, A. A. — Anat. Inst, der Univ., Robert Kochstr. 6, MARBURG/ 

 Lahn, Deutschland. 



a. Aenderungen des Kaulquappen-Wachstums nach beiderseitiger Augen- 

 Extirpation. Es soil hierbei die Rolle des Hypophysen-Zwischenhirn- 

 Systems und der Epiphyse untersucht werden. Bu[o vulgaris (Anura) 



b. Die Feinstruktur der Sinneszellen des Organon frontale bei quaUtativ 

 und quantitativ modifiziertem Lichtreiz. Verhalten der spezifischen, mit 

 Eisen-Haemotoxylin farbbaren Zellstrukturen wahrend des Individual- 

 zyklus. Bufo vulgaris (Larven) (Anura) 



OLIVO, O. M. Med. Dr, Ord. Prof. — 1st. di Istol. e Fisiol. gen., Fac. di 

 Med., Via Belmeloro 8, BOLOGNA. Italia. 



a. Electrophysiology of embryonic heart tissue. Gallus gallus (Aves) 



b. Tissue culture of skeletal muscles. Differentiation and electrophysiology. 

 Gallus gallus (A^ves) 



c. Functional activity of the amnios. Gallus gallus (Ai:>es) 



OLSSON, R. — Zootom. Inst., Univ. of Stockholm, 116 Drottninggatan, 



STOCKHOLM, Sweden, 

 a. Development and anatomy of the nuclei and nerve fibers in the brain. 



Polypterus (Brachiopterygii) 

 OMODEO, P. Dr Sc. — 1st. di Biol, e Zool. gen., Fac. di Med., Piazza 



S. Agostino 4, SIENA, Italia. 



a. Embryology and teratology. (Oligochaeta) 



b. Gametogenesis. (Oligochaeta) 



OORT, J. — Lab. for Exper. Histol., Fac. of Med.. Univ. of Leyden. Was- 

 senaarseweg, Boerhaavekwartier, LEIDEN, Holland, 

 a. Development of the anterior hypophysis. Larus ridibundus (Aves) 



OPPENHEIMER, Miss }. M. Ph.D. — Dept of Biol., Bryn Mawr Coll., 

 BRYN MAWR, Pa, U.S.A. 



a. Studies on early organization of blastoderm. Fundulus heteroclitus 

 (Teleostei) 



b. Studies on development of structure and function of central nervous 

 system. Fundulus heteroclitus (Teleostei) 



ORLANDI. Miss A. Dott. Sci. Biol. — 1st. di Zool. e Anat. comp.. Via 

 Celoria 10. MILANO, Itaha. 

 a. Nucleoproteins and myosin. (Vertebrata) 



h. Nucleoproteins and chromosomes. (Arthtopoda and Vertebrata) 

 ORSKA, Miss J. Ph.D. — Zaktad Anat. Porownawczej, Inst. Zool. Uniw., 

 ul. Sienkiewicza 21, WROCLAW, Poland, 

 a. Development of the vertebral column centra. (Salmonidae and Cyptino- 

 dontidae, Teleostei) 

 ORTOLANI, Miss G. Dr — 1st. di Zool., Via Archirafi 18, PALERMO, 

 Italia. 



