b The morphogenesis of anencephaly. Homo sapiens (Primates) 

 c The development of the inguinal canal. Homo sapiens (Primates) 

 d A new method of tissue grafts in the allantoic cavity. Gallas domesficus (Aves) 

 e Structural changes of allantoic membrane epithelium submitted to the action of different 

 agents. Gallas domcsticus (Aves) 



• PASTEELS, J. J. M.D., Prof. — Lab. d'Anat. et d'Embryol.. Fac. de Med. de I'Univ.. 97 



Rue aux Laines, BRUXELLES, Belgique 

 PASTISSON. C. Dr.en Biol. — Lab. de Biol, gener., Fac. des Sci., B.P. 347. 51-REIMS. 



France 

 a Development of the young gonad; sexual cycle. Pleurodeles Waltlii (Urodela) 

 b Study on the fine structure of sperm. Hirudo medicinalis (Hirudinea, Annelida) 

 c Studies on the fine structure and biochemistry of sexual organs; spermatogenesis and 



oogenesis. Hirudo medicinalis (Hirudinea, Annelida) 

 PATRICOLO, Miss E. Dr.Sc. — 1st. di Zool., Univ. di Palermo, Via Archirafi 18. 90123 



PALERMO, Italia 

 a Enzymatic inhibitors in development. (Ascidiae) 

 h Cellular aggregation. (Amphibia) 



• PATTEN, B. M. Ph.D., Prof. (Emer.) — Dept. of Anat., Med. School, Univ. of Michi- 



gan. East Med. Bldg.. ANN ARBOR. Mich. 48104, U.S.A. 

 a Development of the ventricular wall of the heart. Anas platyrhynchus (Aves), Sus scrofa 



(Artiodactyla), Homo sapiens (Primates) 

 b Endothelial origin of cardiac mesenchyme. Anas platyrhynchus (Aves), Sus scrofa 



(Artiodactyla), Homo sapiens (Primates) 

 PAUTOU (MERIC), Mrs. M. P. Lic.es Sci. — Lab. de Zool., Fac. des Sci. de Grenoble. 



Domaine Universitaire, 38-SAINT-MARTIN-d'HERES, France 

 a Interaction between limb bud ectoderm and mesoderm in xenoplastic associations. Gallus 



domesticus. Anas boschas (Aves) 

 PAWLOWITZKI, I. H. — Inst, fur Humangenetik der Univ.. Vesaliusweg 12/14. 44 MQN- 



STER/Westf., Deutsche Bundesrepublik 

 a Chromosome analysis in spontaneous abortions. Homo sapiens (Primates) 

 PAWcOWSKA, Ms. M. — Veter. Inst, of Histol. and Embryol., High School of Agricult., 



Grochowska 272, WARSZAWA. Poland 

 a Histochemical studies on differentiation of gonads. Bos taurus (Artiodactyla) 

 PAYEN, Miss G. D.E.A. — Lab. d'EvoIution des Etres Organises. Fac. des Sci.. 105 Bd. 



Raspail, PARIS 6e, France 

 a Developpement de I'appareil genital et role de la neurosecretion. Callinectes sapidus, 



Carnicus maenas (Brachyura, Decapoda, Crustacea) 

 h The organogenesis of the gonads and androgenic glands: rearing of larvae of different 



species. Carcinus maenas. Pachygrapsus marmorafus (Brachyura, Decapoda, Crustacea) 

 PECHACKOVA. Miss J. — Inst, of Histol. and Embryol., Fac. of Med., Charles Univ.. 



Karlovarska 48. PLZE55, Czechoslovakia 

 a The development of the venous system. (Amniota) 

 PECK, D. Ph.D. — Dept. of Anat.. Univ. of Kentucky Med. Center, LEXINGTON. Ky.. 



U.S.A. 

 PEDERSEN, K. J. Ph.D. — Inst, of Gen. Zool., Univcrsitetsparken 15, COPENHAGEN 



0, Denmark 

 a Formation of connective tissue filaments in regenerating animals. Dugesia tigrina (Turbel- 



laria) 

 h Cytology and cytochemistry of starving animals. Dugesia tigrina (Turbellaria) 

 c Cellular basis for regeneration. Lineus ruber (Nemertini) 

 PEHLEMANN, F. W. Dr. — Zool. Inst, der Univ.. Siesmayerstr. 70, 6-FRANKFURT/ 



Main, Deutsche Bundesrepublik 

 a Induktion der adenohypophyse. Bomhina variegata. Rana temporaria (Anura) 

 b Regulationsvermogen der Chordaspitze nach Extirpation im Gastrula- bis Schwanz- 



knospenstadium. Bombina variegata (Anura) 

 c Farbwechsel. Xenopus laevis (Anura) 

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



70A, STOCKHOLM. Sweden 

 PENE. J. J. Ph.D. — Inst, for Developm. Biol.. Univ. of Colorado. BOULDER, Colo. 80302. 



U.S.A. 

 a Studies on the conformation of ribosomal 28S RNA from cultured HeLa cells: characte- 

 rization of nuclear and cytoplasmic RNA by zone sedimentation and acrilamide gel 

 electrophoresis. (Mammalia) 

 PENER, M. P. Ph.D. — Dept. of Entomol. and Venomous Animals, The Hebrew Univ.. 



JERUSALEM, Israel 

 a Development of eggs and its interruption under particular conditions of soil moisture. 

 Schistocerca gregaria (Acrididae, Orthoptera) 



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