PASCUAL, Miss A. Dr. — Inst, de Biol. Gener. y Embriol. Exper., Buenos 



Aires 289, TUCUMAN. Argentina 

 a. The tricarboxylic acid cycle in developing eggs. Bufo arenarum (Anura) 

 PASQUINI, P. Ph.D., F.I.I.E., Prof. — 1st. di Zool. dell'Univ., Viale Regina 



Elena 324 (al Policlinico), ROMA, Italia 



a. Enzymes and embryonic development. (Amphibia) (in collaboration with 

 D. PETRUCCI) 



b. Growth and differentiation in regeneration. Hydra spec. (Hydroidea), 

 Planaria spec. (Turbellaria) (in collaboration with D. PETRUCCI) 



PASTEELS, J. J. M.D., F.I. I.E., Prof. — Lab. d'Anat. et d'Embryol., Fac. 

 de Med. de 1'Univ., 97 Rue aux Laines, BRUXELLES, Belgique 



PATANfi, L. Dr.Nat.Sci., Prof. — 1st. di Zool. dell'Univ., Via Androne 81, 

 CATANIA, Italia 

 a. Rigenerazione. (Isopoda) 



PATERSON, Miss M. C. B.A., M.S., Ph.D. — Dept. of Zool., Vassar Coll., 

 POUGHKEEPSIE, N.Y., U.S.A. 



PATRICOLO, Miss E. Dr. — 1st. di Zool., Via Archirafi 18, PALERMO, 

 Italia 

 a. Enzymatic inhibitors in development. (Ascidiae) 



PATTEN, B. M. Ph.D., M.I.I.E., Prof. — Dept. of Anat., Med. School, 

 Univ. of Michigan, 2500 East Med. Bldg., ANN ARBOR, Mich., U.S.A. 



PAVANELLI, Miss C. Dr.Nat.Sci. — 1st. di Anat. Comp., Via Belmeloro 8, 

 BOLOGNA (103), Italia 



PAWSEY, G. J. — Inst, of Animal Genet., Univ. Dept. of Genet., King's Build- 

 ings, West Mains Road, EDINBURGH 9, Scotland 

 a. The utilization of yolk platelets by embryonic tissues studied by means 

 of a safranin staining method. Xenopus laevis (Anura) (in collaboration 

 withG. G. SELMAN) 



PECHAcKOVA, Miss J. — Inst, of Histol. and Embryol., Fac. of Med., Char- 

 les Univ., Karlovarska 48, PLZEN, Czechoslovakia 

 a. The development of the venous system. (Amniota) 



PECK, D. B.S., M.S., Ph.D. — Dept. of Anat., Coll. of Med., Univ. of Flo- 

 rida, GAINESVILLE, Fla., U.S.A. 



a. Effect of cell-cell interactions in cytodifferentiation. Gallus domesticus 

 (Aves) 



b. Effects of anti-metabolites on gene action in differentiating neural and 

 pigmented retina. Gallus domesticus (Aves) 



PEDERSEN, K. J. M.Sc. — Inst, for Aim. Zool., Universitetsparken 3, 



COPENHAGEN 0, Denmark 

 PEHLEMANN, F. W. Dr. — Zool. Inst, der Univ., Siesmayerstr. 70, 



FRANKFURT/Main, Deutsche Bundesrepublik 



a. Induktion der adenohypophyse. Bombina variegata (Anura) 



b. Regulationsvermogen der Chordaspitze nach Extirpation im Gastrula- bis 

 Schwanzknospenstadium. Bombina variegata (Anura) 



PEHRSON, G. T. Dr.Phil., Prof.(Emer.) — Zool. Inst., Univ. of Stockholm, 

 Radmansgatan 70A, STOCKHOLM, Sweden 

 a. Development and morphology of the skull and of the lateralis system. 

 (Teleostei) 

 PENZLIN, H. Dr.rer.nat. — Zool. Inst, der Univ. Rostock, Universitatsplatz, 

 ROSTOCK, Deutsche Demokratische Republik 

 a. Physiologie der Regeneration. Cordylophora caspia (Hydrozoa) 



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