NUMANOI, H. Ph.D. — Biol. Inst.. Coll. of Gener. Education, Univ. of 

 Tokyo, 865 Komaba-cho, Meguro-ku, TOKYO, Japan 

 a. Biochemical study of fertilization substances, with special reference to the 

 physiology of polyphenol sulfate and choline derivatives. (Echinoidea) 

 NURJEHAN. Miss B. M.Sc. — Dept. of Zool., Presidency Coll., College 

 St., CALCUTTA 12, India 

 a. Mitotic counts in organ rudiments. Gallus gallus (Aues) 

 b Effects of cell free proteins on differentiation. Gallus gallus (Aves) (in 

 collaboration with S. MOOKERJEE. S. ADHIKARI and S. GHOSAL) 

 NYHOLM, K. G. Fil.Dr. — Zootom. Inst., Stockholms Hogskola, STOCK- 

 HOLM, Sweden 



a. Study of the development. (Echinoderidae, Aschelminthes) 



b. Study of the life-history. (Rhizopoda monothalamia) 



OBIKA, M. M.A. — Biol. Lab., Keio Univ., YOKOHAMA, Hiyoshi, Japan 

 a. Correlation between pigment formation and pterin derivatives during 

 development. (Amphibia) 

 O'BRIEN, B. R. A. B.Sc, Ph.D. — Dept. of Embryol. and Histol., Univ. of 

 Sydney, SYDNEY, N.S.W., Australia 

 a. Haemoglobin synthesis and y-Azoguanine inhibition. Gallus domesticus 

 (Aves) 

 O'BRIEN J. P. Ph.D. — Dept. of Biol., Marquette Univ., 1217 West Wis- 

 consin Ave., MILWAUKEE 3, Wis., U.S.A. 



a. Regression of larval and adult limb and tail following exposure to X-rays 

 or denervation. Triturus viridescens, Ambystoma punctatum (Urodela) 



b. Spindle-cell sarcoma of adult animals. Tritutus viridescens, Ambystoma 

 punctatum (Urodela) 



c. Radiosensitivity in relation to temperature prevailing during exposure. 

 Rana catesbiana, R. pipiens, Triturus viridescens (Amphibia), Mus 

 rattus, Lepus americanus (Rodentia) 



e. Irradiation of solely the circulating blood. (Vertebrata) 



OBRUcNlK, M. MUDr., C.Sc. — Inst, of Histol. and Embryol, Fac. of 

 Med., Palacky Univ., Fierlingerova ul., OLOMOUC, Czechoslovakia 



O'CONNOR, R. J. M.D., D.T.M. — Research Labs., Westminster Med. 

 School, Udall St., Vincent Square, LONDON S.W. 1, England 



OELHAFEN, F. H. Dipl.Zool. — Zool.-vergl. Anat. Inst, Naturw. Fak., 

 Univ. Zurich, Kiinstlergasse 16, ZURICH 6, Schweiz 

 a. Embryonalentwicklung. Culex pipiens (Diptera) 



O'FARRELL, A. F. B.Sc, ARCS — Dept. of Zool., Univ. of New England, 

 ARMIDALE, N.S.W., Australia 

 a. Regeneration and the endocrine system. Blattella germanica (Dictyo- 

 ptera, Insecta) (in collaboration with A. STOCK and Miss J. MOR- 

 GAN) 



OGREN R. E. A.B., M.S., Ph.D. — Biol. Dept., Dickinson Coll., CAR- 

 LISLE, Pa., U.S.A. 



a. Embryonic development (maturation, cleavage). Dilepsis undula (Cyclo- 

 phyllidea, Cestodes) 



b. Structure and development of hexacanth embryos (oncospheres). Hy~ 

 menolepsis diminuta (Cyclophyllidea, Cestodes) 



OIKAWA, Miss I. B.Sc. — Fac. of Education, Kochi Univ., KoCHI, Japan 

 a. The anterior transverse neural fold. (Amphibia) 



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