O., Netherlands 



a. Effect of X-rays on the pattern of nucleic acids in the regenerate. Am- 

 bystoma mexicanum (Urodela) (in collaboration with H. A. L. TRAM- 

 c L4.ov_.Jrl I 



b. Nerve effect on regeneration. Amby stoma mexicanum (Urodela) (in 

 collaboration with H. A. L. TRAMPUSCH) 



VIGNAU, Miss J. Dr.Biol.anim. — Lab. de Zool. exper., Fac. des Sci de 

 Bordeaux, 40 Rue Lamartine, TALENCE (Gironde), France 

 a. Recherches experimentales sur la morphogenese embryonnaire de la 

 tete. Carausius spec. (Orthoptera) 

 VILlMKOVA (HABROVA), Mrs. V. Dr. — Dept. of Gener. and Exp. 

 Zool.. Charles Univ., Vinicna 7, PRAHA 2, Czechoslovakia 

 a. Nucleic acids and subcellular particles in oogenesis and early develop- 

 ment. (Amphibia) (in collaboration with J. NEDVIDEK) 

 VINCENT, W. S. B.S., M.S., Ph.D., M.I.I.E., Prof. — Dept. of Anat.. 



School of Med., Univ. of Pittsburgh, PITTSBURGH 13. Pa., U.S.A. 

 VINCENTIIS, M. de M.I.I.E., Prof. — Cattedra di Istol. cd Embriol.. Univ. 



di Camerino. CAMERINO. Italia 

 VISSER, J. G. J. B.Sc. M.Sc. — Dept. of Zool., Univ. Coll. of Fort Hare. 

 FORT HARE, C. P., Republic of South Africa 

 a. Ontogeny of the chondrocranium. Microsaura pumila pumila (Chamael- 

 eontidae, Lacertilia) 

 VISSER, M. H. C. M.Sc. — Zool.Inst., Fac. of Sci., Univ. of Stellenbosch, 

 STELLENBOSCH. Republic of South Africa 

 a. General ontogeny. Gonaxis gwandaensis (Streptaxidae, Pulmonata) 

 VITTORELLI, Miss M. L. Ph.D. — 1st. di Anat. comp.. Univ. di Palermo, 

 Via Archirafi 22, PALERMO, Italia 

 a. Yolk utilization during embryonic development. Paracenttotus lividus 

 (Echinoidea) 

 VIVIEN, J. H. Dr.es Sci., M.I.I.E., Prof. — Lab. de Zool. et d'EmbryoI. 

 exper., Fac. des Sci., Univ. de Strasbourg, 12 Rue de I'Universite, 

 STRASBOURG, France 

 a. Morphogenese des gonades et du tractus genital. (Selachii; Reptilia) 

 h. Correlations neuro-endocrines. (Pisces; Amphibia; Reptilia) 



c. Differenciation structurale et ultrastructurale de I'epiphyse. (Pisces: 

 Reptilia) 



VLIEGENTHART, W. E. Drs. — Anat.-Embryol. Lab., State Univ. of 



Utrecht, Janskerkhof 3A, UTRECHT, Netherlands 

 a. Analysis of morphological development by studies of the effects of 



colchicine. Mas musculus (Rodentia) 

 VOCE, Mrs. M. Ph.D., Prof. — Dept. of Med. Microbiol, and Immunol., 



School of Med., Univ. of Cahfomia, LOS ANGELES, Calif. 90024, 



U.S.A. 



a. Cytologic studies on the embryo. Hymenolepis diminuta. H. citelli (Ces- 

 todes) 



b. Differentiation and growth of the embryo to the fully developed 

 cysticercoid (cell typing and cell counts at different stages to determine 

 the ultimate fate of the different types of cells originally present in the 

 embryo). Hymenolepis diminuta, H. citelli (Cestodes) 



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