a. Biochemical and immunochemical studies of lens development. Gallus 



gallus (Aves) 

 PARK, Miss H. D. Ph.D. — National Inst, of Arthritis and Metabolic 



Diseases, BETHESDA 14, Md., U.S.A. 

 a. Induction of differentiation of the male gonad. Hydra littoralis (Hydroi- 



dea) 

 PASCHMA, M. M.Ph. — Zaklad Zool. Ogolnej, Inst. Zool., Uniw. we 



Wrodawiu, ul. Sienkiewicza 21, WROCLAW, Poland 

 PASQUINI, P. Ph.D., F.I.I.E., Prof. — 1st. di Zool. della 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. (Turbellatia) (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 l'Univ., 97 Rue aux Laines, BRUXELLES, Belgique 



a. Study of metachromatic granules in eggs in vivo. Barnea spec. 

 (Mollusca Bivalva) 



b. Electron-microscopical analysis of egg structure. Barnea spec. (Mollusca 

 Bivalva) 



PATANfi, L. Dr. Nat. Sci. — 1st. di Zool. dell'Universita di Catania, Via 



Androne 25, CATANIA, Italia 

 a. Rigenerazione. Porcellio laevis (Oniscoidea, 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. 



a. Arnold-Chiari malformation. Homo sapiens (Primates) 



b. Persistent interatrial foramen primum. Homo sapiens (Primates) 

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



BOLOGNA (103), Italia 

 a. Nucleic acids and phosphorus in development. (Anura; Aves) (in colla- 

 boration with Miss M. R. ROSSI) 



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

 PENHAGEN 0, Denmark 



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

 holm, 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, Stalinplatz, 

 ROSTOCK, Deutsche Demokratische Republik 



a. Physiologie der Regeneration. Cordylophora caspia (Hydrozoa) 



b. Physiologie und Histologic der Regeneration. Blattella spec. Periplaneta 

 spec. (Orthoptera) 



PERA, L. M.D. — Inst, of Anat. and Histoembryol., Univ. of Pisa, Via 

 Roma 33, PISA, Italy 



a. Comparative studies on the sympathetic nervous system. (Reptilia; Aves) 



b. Comparative research on the cloaca. (Pisces; Reptilia; Aves) 



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