Pasteels 73 Piatt 



a. Cytochemical observations on the first developmental stages. (Amphibia) 

 (in collaboration with J. L. A. BRACKET) 



b. The early development from late neurula stage to an advanced tailbud 

 stage (esp. morphological data for experimental work). Xenopus laevis 

 (Anura) (Normal Table) 



PATANE', L. Dr, Aiuto — 1st. di Zool. e Anat. comp.. Via Androne 25, 



CATANIA, Italia (no data received over some years) 



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



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



(no data received over some years) 

 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 (Crossopterygii) 



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 maculatum (Urodela) (in collaboration with P. ROOFE) 

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

 BOSCH, South Africa 

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

 PERLMANN, H. P. — Wenner-Grens Inst, for experimental Biology, Norr- 

 tullsgatan 16, STOCKHOLM Va., Sweden 

 (no data received on Nov. 1^', 1953) 

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

 Borelli 50, ROMA. Italia 

 a. Ricerche sull'induzione di arti sopranumerari. (Anura) 

 h. Trapianti embrionali di abbozzi di arti. (Anura) 



c. Esperienze sulla regione sacrale. (Anura) 



d. La simmetria speculare in biologia. 



e. Esperienze sulla competenza embrionale e larvale. 



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

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

 land 

 a. On the effect of acetic acid on the early ontogenetic development. Tri- 

 turus (Urodela) 

 PETER, K. F.I.I.E., Dr, Prof. (Emer.) — BIRKENSTEIN. Post FISCH- 



BACHAU, Oberbayern. Deutschland 

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

 Hochschule. STUTTGART-HOHENHEIM. Deutschland 

 a. Anderung des Stoffwechsels nach Storung des hormonalen Gleichge- 



wichts. (Insecta) 

 h. Entwicklungsphysiologie von Schwanzmissbildungen. (Aves) 

 c. Einfluss der Pinealektomie auf die Postembryonalentwicklung. Lebistes 

 reticulatus (Teleostei) 

 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. 

 a. Regeneration of central nervous system in embryonic and adult stages. 

 Ambystoma punctatum and tigrinum (Urodela) 



