c. Embryologie et croissance du squelette des membres. Homo sapiens (Pri- 

 mates) (en collaboration avec H. PINEAU) 

 OLSSON, R. Fil.lic. — Zootom. Inst., Univ. of Stockholm. 70A Radmans- 

 gatan, STOCKHOLM, Sweden 



a. Development of nuclei and fibres in the brain. Polypterus spec. 

 (Brachiopterygii) 



b. Development of Reissner's fibre and the infundibular and subcommissu- 

 ral organs. Sranc/zios^oma spec. (Ccphalochotdata) , (several Vertebrata) 



c. Development of the epithalamus. (Branchiopterygii) 



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



S. Agostino 4, SIENA. Italia 

 OPPENHEIMER. Miss J. M. B.A., Ph.D., M.I.I.E. — Dept of Biol., Bryn 



Mawr Coll., BRYN MAWR, Pa. U.S.A. 



a. Experimental analysis of regional determination within the brain. Fun- 

 dulus heteroclitus (Teleostei) leostei) 



b. Differentiation of extra-embryonic grafts. Fundulus heteroclitus (Te- 

 O'RAHILLY, R. M.Sc, M.D., Prof. — Dept of Anat., Coll. of Med., 



Wayne State Univ., DETROIT 7, Mich.. U.S.A. 



a. Morphogenesis and developmental histochemistry of embryonic eye. 

 Gallus domesticus (Aves) (in collaboration with D. B. MEYER) 



b. Development of skeleton and joints of foot in embryo and fetus. Homo 

 sapiens (Primates) (in collaboration with E. GARDNER and D. J. 

 GRAY) 



ORSINI, Mrs M. C. WARD B.A., Ph.D. — Dept of Anat., Bardeen Med. 



Labs, Univ. of Wisconsin. MADISON 6. Wis., U.S.A. 

 a. Fetal membranes, giant cells, and pregnancy changes in uterine vessels. 



Cricetus auratus (Rodentia) 

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



ul. Sienkiewicza 21. WROCLAW, Poland 



a. Development of the vertebral column centra. (Salmonidae, Teleostei) 



b. Influence of temperature on development of axial skeleton. (Teleostei) 

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



Italia 

 a. Experiments on merogony. (Ascidiaceae) 

 ORTS LLORCA, F. M.I.I.E., Prof. — Lab. de Anat. y Embryol., Fac. de 



Med., Ciudad Univ.. MADRID, Spain 

 OSAWA, S. M.A. — Biol. Inst., Fac. of Sci., Nagoya Univ., Chigusa-Ku, 



NAGOYA. Japan 



a. Isolation of the bone marrow factor, which is responsible for induction 

 of mesodermal structures in the ectoderm of the gastrula. (Amphibia, 

 Mammalia) (in collaboration with K. TAKATA and T. YAM AD A) 



b. Studies on the ribonucleoproteins isolated from various tissues. (Mam- 

 malia) (in collaboration with K. TAKATA) 



OVER, H. }. B.Sc. — Hubrecht Lab., Intern. Embryol. Inst., Janskerkhof 2, 

 UTRECHT, Holland 

 a. Search for species-specific histo- and cytological characteristics in early 

 development. Representatives of various groups (Aves) 

 OVERTON. Mrs J. Dr — Dept of Zool., Univ. of Chicago, CHICAGO 37, 



111., U.S.A. 

 OZBURN, R. H. Prof. — Dept of Entomol. and Zool., Ontario Agricultural 

 Coll., GUELPH. Ont.. Canada 



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