Slipka-Stc 



a. The development of the branchial region. (Amniota, including Homo 

 sapiens) 



b. The early development of the thyroid gland. (Amniota, including Homo 

 sapiens) 



SMET, W. M. A. de Lie. Zool. Sci. — Kasteellei 57, BRASSCHAAT, Bel- 

 gium 



— Inst, de Zool., Univ., de Louvain, 71 Rue de Namur, LOUVAIN 

 SMITHBERG, M. Ph.D. — Dept. of Anat, Coll. of Med., Univ. of Flori- 

 da, GAINESVILLE, Florida, U.S.A. 

 a. Teratology. 

 SMRECZYNSKI, S. Ph.D. — Zool. Dept. of the Jagiellonian Univ., St. 



Anne 6, KRAKOW, Poland 



(no embryological work in progress) 

 SNELLEN, H. A. Med.Dr., Prof. — Anat.-Embryol. Lab. of the Univ., Fac. 



of Med., Wassenaarseweg, Boerhaavekwartier, LEIDEN, Holland 

 a. Heart and vessels in congenital malformations. Homo sapiens (Primates) 



(in collaboration with J. DANKMEIJER, Miss A. DEKKER and Miss 



H. C. van INGEN) 

 SNOOK T. B.S., M.S., Ph.D. — Dept. of Anat., School of Med., Univ. of 



North Dakota, GRAND FORKS, N.Dak., U.S.A. 

 SOBEY, W. R. Ph.D. — C.S.I.R.O. Anim. Genet. Sect., c/o Dept. of Zool., 



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

 SPIEGEL, M. B.S., Ph.D. — Dept. of Zool., Dartmouth Coll., HANOVER, 



New Hampshire, U.S.A. 

 a. Protein changes in development. Arbacia punctulata (Echinoidea) , Rana 



pipiens (Anura) 

 SPIRITO, A. Dott., M.I. I.E., Prof. — 1st. di Biol, gen., Fac. di Med., S. 



Pietro, PERUGIA, Italia 

 a. Origine e natura dei tumori. Bufo spec. (Anura) 

 SPOFFORD W. R. Ph.D., Prof. — Dept. of Anat., School of Med., State 



Univ. of New York, 766 Irving Ave., SYRACUSE 10, N.Y., U.S.A. 



a. Induction and determination in the neural plate. A^mbystoma maculatum 

 (Urodela) 



b. Experimental neurogenesis. Ambystoma maculatum (Urodela) 

 SPRATT, N. T., Jr. A.B., Ph.D., M.I. I.E., Prof. — Dept. of Zool., Coll. of 



Sci., Lit. and Arts. Univ. of Minnesota, MINNEAPOLIS 14, Minn., 

 U.S.A. 



a. Investigating the nutrient requirements essential to morphogenesis and 

 growth in the early stages of development (pre-streak and streak blasto- 

 derms). Gallus domesticus (Aves) 



b. Survey of dehydrogenase enzymes in early embryos: 1. Localization of 

 enzyme activity. 2. Structural integrity and enzyme activity. Gallus 

 domesticus (Aves) rata) 



c. Regeneration. Planaria spec. (Turbellaria) , Tubularia spec. (Coelente- 



d. Cytological study of the developmental center (organizer). Gallus do- 

 mesticus (Aves) 



e. Analysis of mechanism of morphogenetic movements by time-lapse cine- 

 matography. Gallus domesticus (Aves) 



f. Analysis of dynamic population patterns (Pattern formation by free- 

 swimming, ciliated and flagellated organisms). Tetrahymena spec, 

 Euglena spec. (Protozoa), Arbacia punctulata (Echinoidea) 



116 



