Starck 84 Steph 



b. Chondrocranium and osteocranium of birds especially orbitotemporal 

 region of skull. Struthio, Sula, Diomedea and Spheniscus (Aves) (com- 

 parative Embryology) 



STARK, O. Dr — Heiligenberg-Inst. (Abtlg. Mangold), (17b) HEILIGEN- 

 BERG, Kreis Oberlingen/Bodensee, Deutschland (Franzosische Zone), 

 a. Entstehung und Determination der Geschlechtszellen und Gonaden bei 

 Urodelen (gemeinsam mit O. MANGOLD). Triton (Amphibien) 



STEIGER, H. — Zool. Anstalt der Univ., Rheinsprung 9, BASEL, Schweiz. 

 (no data received over this year) 



STEINER, H. Ph.D., Prof. — Zool.-vergl. Anat. Inst., Naturw. Fak., Univ. 

 Zurich, Kiinstlergasse 16, ZURICH 6, Schweiz. 



a. Development of the tetrapodAimb with special reference to Mammals, 

 (embryological evidence of their arboreal origin). (Amphibia, Reptilia, 

 Aves and Mammalia) 



b. New embryological evidence of the "biogenetic law" in connection with 

 the phenomenon of iteration and convergence, rudimentation and adap- 

 tation. (Vertebrates) 



c. Embryological analysis of feather-growth. The problems of the "after- 

 schaft" and of "diastataxy". (Ratites and Carinatae) (Aves) 



d. Colour and pigment-differentiation in the bird's feather. Melopsittacus 

 undulatus 



STEINERT, M. Lic.Sc. — Lab. de Morphol. anim., Univ. libre de Bruxelles, 

 1850, Chaussee de Wavre, BRUXELLES- Auderghem, Belgium. 



a. Studies on nucleic acids synthesis during morphogenesis. (Various 

 species of Amphibia) (in collaboration with R. THOMAS) 



b. Action of specific nucleic acids on morphogenesis. (Various species of 

 Amphibia) (in collaboration with R. THOMAS) 



STEFANELLI, A. Dr, Prof. — 1st. di Zool., Univ. di Stato, Viale S. Bar- 

 tolomeo 1, CAGLIARI, Sardegna, Italia. 



a. Determination, differentiation and involution of nervous cells. (Reptiles, 

 Fishes and Amphibians) 



b. Metamorphosis of nervous system in Amphibians. 



c. Regeneration of nervous tissue. (Reptiles and Amphibians) 



d. Embryo metabolism, respiration. (Fishes and Amphibians) 



e. Nucleic acid synthesis in development. (Fishes) 



STELT, A. v. d. — Zool. Lab., Univ. of Amsterdam, 44 Plantage Doklaan, 



AMSTERDAM, Holland, 

 a. Investigation of the development of the artery-arches in turtle embryos. 



(Reptilia) 

 STEPHAN, Fr. Lie. es Sc. — Lab. de Zool. de la Fac. des Sci. et Lab. 



d'Embryol. et Teratol. exper. du C.N.R.S., Institut de Zool. et de Biol. 



generale, 12, Rue de l'Universite, STRASBOURG, France. 



a. Formation du systeme vasculaire extraembryonnaire et son extension. 

 Developpement du coeur et des gros troncs arteriels de l'embryon. Gallus 

 domesticus (Aves) 



b. Etude experimentale des anomalies et des suppleances vasculaires dans 

 l'aire extraembryonnaire et l'embryon. Gallus domesticus (Aves) 



STEPHENSON, N. G. M.Sc. — Auckland Univ. Coll., New Zealand, 

 Australia, 

 (no data received over this year) 



