Petz 73 Por 



b. Embryonic effects of organ-specific antibodies combined with radioactive 



tracers. Gallus (Aves) (in collaboration with P. A. WEISS) 

 PFLEGER, Mile D. 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 I'Universite. STRASBOURG, France, 

 a. Role des hormones dans la differenciation sexuelle. Etudes biochimiques 



sur la regression des canaux de Miiller. Gallus (Aves) (en collaboration 



avec Et. WOLFF) 

 PFLUGFELDER, O. Dr rer. nat., Prof. — Zool. Inst, der Landwirtschaftl. 



Hochschule. STUTTGART-HOHENHEIM (Ha). Deutschland. 



a. Funktion der inkretorischen Driisen, mit bes. Beriicksichtigung der Meta- 

 morphose. Carausius (Insecta) 



b. Tumorentstehung nach Storung des Hormonhaushalts. (Evertebrata und 

 Vertebrata) 



c. Wachstum und Differenzierung der Ganglienzellen des Mesencephalon 

 und der Pseudobranchien nach Extirpation der Augen. (Pisces) 



d. Parasitaire Phase der Glochidienentwicklung. (Anodonta, Lamellibran- 

 chiata) 



PHILLIPS, Miss R. J. S. B.Sc. — Med. Res. Council, Inst, of Anim. Genet.. 

 West Mains Rd.. King's Buildings, EDINBURGH 9, Scotland (U.K.) 

 a. Developmental study of a new fifth-toe Polydactyly and urogenital ab- 

 normalities in a stock of mice. Mas musculus (Rodentia) 



PIATT, J. A.B., M.A., Ph.D., Assoc. Prof. — Dept of Anat., School of 

 Med., Univ. of Pennsylvania, PHILADELPHIA 4, Pa, U.S.A. 

 (no data received over this year) 



PIEPHO, H. Dr Phil., Prof. — Zool. Inst, der Univ. Gottingen, Mathem.- 

 Naturw. Fak., Nicolausbergerweg 75, GoTTINGEN, Deutschland. 

 (no data received over this year) 



PINCUS, G. Dr, Prof. — Tufts Coll., Med. School and Worcester Foun- 

 dation for Exper. Biol., 222 Maple Ave, SHREWSBURY, Mass.. 

 U.S.A. 

 (no data received) 



PISANO, A. Dr Biol. Sc. — Inst, de Zool., Univ. Nac. de Tucuman, Miguel 

 Lillo 205, TUCUMAN, Argentinien, S. America, 

 (no data received over this year) 



PLANQUE, B. de — Hubrecht Lab., Internat, Embryol. Inst., Janskerkhof 2. 

 UTRECHT, Holland. 

 a. Regulation potencies in the neural plate. Formation of neural crest by 

 regulation after implantation of young neural plate tissue in the ventral 

 side of neurulae, or by homogenetic induction after implantation in 

 middle gastrulae (heteroplastic transplantation). Triturus taeniatus, 

 alpestris and cristatus (Urodela) 



PLETZEN, R. van Dr — Dept of Zool., Univ. of O.F.S., BLOEMFON- 

 TEIN, South Africa. 



a. The ontogenesis and morphogenesis of the breast-shoulder apparatus. 

 Xenopus laevis (Anura) 



b. Ontogenesis of skeleton and muscles of shoulder girdle and forelimbs. 

 Xenopus laevis (Anura) (Normal Table) 



PORTMANN, A. Dr Phil., Prof. — Zool. Anstalt der Univ., Rheinsprung 

 9, BASEL, Schweiz. 

 (no data received over two years) 



