a EHapause and developmental pathology (effect of environmental factors on embryonic 

 development). Nothobranchius guentheci, Rivulus cylindraceus (Cyprinodontidae. Teleostei) 



b Effect of metabolic inhibitors on embryonic development. Nothobranchius guenfheri, Ri- 

 vulus cylindraceus (Cyprinodontidae. Teleostei) 



c Development of eye-rudiments in cave-fish. Astyanax mexicanus (Characinidae, Teleostei) 



PETERS. Th. Dr.med. — Anat. Inst, der Univ. Giessen. Friedrichstr. 24, 63 GIESSEN, 

 W. Germany 



PETIT, A. Lic.es Sci. — Lab. de Zool. et d'Embryol. Exper., Univ. de Strasbourg, 12 rue 

 de I'Universite. STRASBOURG, France 



PETRUCCI, D. — Dept. of Gen. Biol., Univ. of Sassari, SASSARI, Italy 



PETRY, G. Dr.med., Prof. — Anat. Inst, der Univ.. Robert Kochstr. 6. 355 MARBURG/ 

 Lahn, W.Germany 



PEXIEDER, T. M.D. — Inst, of Embryol., Fac. of Med., Charles Univ., Albertov 4, 

 PRAGUE 2. Czechoslovakia 



— temporarily: Inst. d'Histol. et d'Embryol., Univ. de Lausanne, 9 rue du Bugnon, 1005 

 LAUSANNE, Switzerland 



a Normal development of the aortic arches. Callus domesticus (Aves) 



h Experimental morphology of the aortic arches and branchial arches. Callus domesticus 

 (Aves) 



c Embryophysiology of the circulation in the aortic arches. Callus domesticus (Aves) 



d Cell death in the development of the heart. Callus domesticus (Aves) 



PFLUGFELDER, O. Dr.rer.nat., Prof. — Zool. Inst., Naturwissensch. Fak.. Hochschule 

 Hohenheim, 7 STUTTGART-Hohenheim, W.Gerniany 



a Anderung des Stoffwechsels nach Storung des hormonalen Gleichgewichts. (Insecta) 



b Einfluss der Pinealektomie auf die Postembryonalentwicklung. (Teleostei) 



c Histophysiologie der Corpora allata nach experimenteller Beeinflussung. (Insecta) 



d Wirkungsmechanismen von Thyreostatika. Rana temporaria, Xenopus laevis (Anura), 

 Lacerta spec. (Reptilia), Callus domesticus (Aves) 



e Biomorphose. 



f Egg formation in giant animals. Carausius morosus ( Phasmidoptera) 



PHILLIS. J. W. Ph.D. — Dept. of Physiol.. Monash Univ., CLAYTON, Vict. 3168, 

 Australia 



a Descriptive morphology and histochemistry, and experimental morphology of the cerebel- 

 lum (C.R. length 2 cm until after birth). Felis domestica (Carnivoca) 



PIATIGORSKY, J. Ph.D. — Lab. of Developm. Biol., Sect, on Exper. Embryol., Natl. Inst, 

 of Child Health and Human Developm., Natl. Inst, of Health, BETHESDA, Md. 20014, 

 U.S.A. 



a The role of RNA in the development of the lens. Callus domesticus (Aves) 



b The regulation of protein synthesis in eggs and embryos. (Echinoidea) 



PIATT. J. Ph.D. — Dept. of Anat., School of Med.. Univ. of Pennsylvania. PHILA- 

 DELPHIA. Pa. 19104, U.S.A. • 



PICHERAL. B. Dr.3eme Cycle — Lab. de Biol. Gen., Fac. des Sci.. 35 RENNES, France 



a Nuclear transplantation. (Amphibia) 



b Spermatogenesis. (Amphibia) 



PICKWORTH, Miss S. Ph.D. — Dept. of Zool, Univ. of Bristol, BRISTOL BS8 lUG, 

 England 



a Artificial activation of egqs. pronucleus formation. Mesocricetus aucatus (Rodentia) 



PIDDINGTON, R. L. Ph.D. — Dept. of Biol., Grad. School of Arts and Sci.; Lab. of 

 Histol. and Embryol., School of Dental Med., Univ. of Pennsylvania, PHILADELPHIA, 

 Pa. 19104, U.S.A. 



a Studies on a causal relationship in the embryo between the steroidogenic activity of the 

 adrenal glands and the normal pattern of glutamine synthetase activity in the neural retina. 

 Callus domesticus (Aves) 



PIEAU, C. Lic.es Sci. — Serv. d'Embryol. Exper. de I'lnst. Pasteur, 20 rue des Moulins, 

 95 SANNOIS, France 



a Researches on the mechanisms of sexual differentiation. Cistudo euvopaea, Testudo graeca 

 (Chelonia) 



b Researches on the establishment of urogenital connections and upon the development of 

 the cloaca. Anguis fragilis (Lacertilia) 



c Effects of X-rays on embryonic development. Lacerta viridis. Anguis fragilis (Lacertilia) 

 (in collaboration with A. RAYNAUD) 



PIERRO, L. J. Ph.D.. Prof. — Dept. of Anim. Genet.. Storrs Agric. Exper. Station. Univ. 

 of Connecticut. STORRS. Conn. 06268, U.S.A. 



a Chemical teratogenesis: inhibitors of nucleic acid and protein metabolism. Callus domes- 

 ticus (Aves) 



b Gene interaction in the control of formation of specific melanin granules. Mus musculus 

 (Rodentia) 



c Eye development. Mus musculus (Rodentia) 



d Developmental genetics. Callus domesticus (Aves) 



137 



