Pas-Pre 



PASQUINI. P. Ph.D.. Prof. — 1st. di Anat. Comp., Via Belmeloro 8, 

 BOLOGNA (103). Italia 



a. Effects of antimitotics on early development and on lens-regeneration. 

 Rana csciilenta. Triton and Amby stoma (Amphibia) (in collaboration 

 with Miss I. DE CESARE) 



b. Effects of antimitotics on the regeneration of peripheral nerves. (Uro- 

 Jcla and Aniira) (in collaboration with S. LEGHISSA) 



c. Effects of low tempcraUirc on early development. (Amphibia) (in colla- 

 boration with L. RAUNICH) 



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

 Med. de TUniv.. 97 Rue aux Laines. BRUXELLES, Belgique 



a. General survey of development. Chrysemis, Pseudemys, Chelone (Che- 

 Ionia), Chamaelco. Mabiiya (Sauria) 



b. Cvtochemical observations on the first developmental stages. (Amphibia) 

 (in collaboration with }. BRACHET) 



c. Cytochemical observations on first development. (Mollusca; Echinoidea) 

 PATTEN. B. M. Ph.D.. ProL — Dept of Anat.. Med. School. Univ. of 



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

 PEET, Miss H. M. B.Sc. — Zool. Lab. der Rijks Univ.. Janskerkhof 3, 

 UTRECHT. Holland 

 a. Polarization microscopy of shell gland. Limnaea stagnalis (Gastropoda) 

 h. Influence of Beryllium on birefringence of shell gland cells. Limnaea stag- 

 nalis (Gastropoda) 

 PEHRSON, G. T. Dr Phil.. Prof. — Zootom. Inst., Univ. of Stockholm. 116 

 Drottninggatan, STOCKHOLM, Sweden 



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

 (Osteoglossidae and Characinidae. Teleostei) 



b. Ontogeny of the skull. Polypterus (Crossoptcrygii) 



PENFOLD. R. A.B. — Dept of Anat.. Med. School. Univ. of Kansas. 



LAWRENCE. Kansas, U.S.A. 

 a. Reconstruction of brain and cranial nerves of the first 4 Coghill stages. 



Amby stoma maculatuin (Urodela) (in collaboration with P. G. ROOFE) 

 PENTZ. Miss K. M.Sc. — Zool. Inst., Univ. of Stellenbosch, STELLEN- 



BOSCH. South Africa 

 a. Ontogenesis of the skull. Hynobiiis [uscus (Urodela) 

 PERCIVAL, E. — Dept of Zool., Canterbury Univ. Coll.. CHRIST- 

 CHURCH. New Zealand 

 a. Embryology. Tcgulorhynchia nigricans (Brachiopoda) 

 PERLMANN, H. P. — Wenner-Grens Inst, for experim. Biol., Norrtulls- 



gatan 16. STOCKHOLM Va., Sweden 

 PERRI. T. Dott., Prof. — 1st. di Anat. Comp. dell'Univ., Fac. di Sci., Via 



Borelh 50, ROMA, Italia 

 PERSSON. H. Fil.mag. — Zoophysiol. Inst.. Univ. of Lund. LUND. 



Sweden 



a. Nucleic acid metabolism during development. Paracentrotus lividus 

 (Echinoidea) 



b. Mitotic synchronization of cells in tissue culture. Galhis domesticus 

 (Aves) 



PESONEN, S. K. Dr Phil. — Dept of Physiol.. Zool. Lab., Fac. of Mathem. 

 and Nat. Sci., Univ. of Helsinki, P. Rautatiekatu 13. HELSINKI, Fin- 

 land (no embryological work in progress) 



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