Tuchman-Ven 



c. Influences des hormones sur le developpement foetal. Rattas spec. (Ro~ 



dentia) 

 TUCKER, R. D.V.M. — Dept. of Veter. Anat. and Parasitol., School of 



Veter. Sci., Univ. of Queensland, Fairfield Road, Yeerongpilly, BRIS- 

 BANE, Queensland, Australia 

 TUFT, P. H. M.A., Ph.D. — Dept. of Zool., Univ. of Edinburgh, West 



Mains Road, EDINBURGH 9, Scotland 

 a. Embryonic growth: cell number, mass, density, uptake and distribution 



of water. Rodnius spec. (Hemiptera) , Brachydanio rerio (Teleostei), 



Xenopus laevis (Anura) 

 TUNG, T. C. Dr., F.I. I.E., Prof. — Lab. of Developm. Physiol, Inst, of Ex- 



per. Biol., Acad. Sinica, 320 Yo Yang Road, SHANGHAI, China 

 TUSQUES, J. M. Dr. en Med., Dr. es Sci., Prof . — Lab. d'Histol., Fac. de 



Med., 16, Quai Moncousu, NANTES, France 



(no embryological work in progress) 

 TWITTY, V. C. Dr., F.I.I.E., Prof. — Dept. of Biol., Stanford Univ., 



STANFORD, Cal, U.S.A. 

 TYLER, A. Ph.D., F.I. I.E., Prof. — Dept. of Embryol., Div. of Biol., Calif. 



Inst, of Technol., PASADENA 4, Cal., U.S.A. 



a. Physiology of fertilization. (Echinoidea) 



b. Physiology of early development. (Echinoidea, Polychaeta) 



c. Life-span, motility and metabolism of spermatozoa. ( Echinodermata, 

 Annelida, Mollusca, Aves, Mammalia) 



a. Immuno-embryology. (Echinodermata etc. ) 

 UBBELS, Miss G. A. M.Sc. — Zool. Lab. der Rijks Univ., Janskerkhof 3, 

 UTRECHT, Holland 



a. The role played by the follicle cells around the growing oocyte in the 

 ovariotestis. Limnaea stagnalis, L. peregra (Gastropoda) 



b. Cytochemistry of oogenesis. Limnaea stagnalis (Gastropoda) (in colla- 

 boration with Chr. P. RAVEN) 



UBISCH, L. v. Dr. jur. et phil., F.I.I.E., Prof. (Emer.), Prof. (Hon.) Ham- 

 burg — PARADIS, Norway 



a. Entwicklung und Metamorphose des Pluteus. Genocidaris maculata, 

 Spaerechinus granulans (Echinoidea) 



b. Skelettentwicklung. Arbacia lixula (Echinoidea) 



c. Reziproke Bastardplutei. Genocidaris maculata, Paracentrotus lividus 

 resp. Psammechinus microtuberculatus (Echinoidea) 



d. Merogone. (Genocidaris 9 ) Paracentrotus $ resp. Psammechinus $ und 

 vice versa (Echinoidea) 



UHLIN, G. Fil.mag. — Inst, of Zoophysiol., Univ. of Uppsala, UPPSALA, 

 Sweden 

 a. The mechanism of agglutination of spermatozoa. (Mammalia) (in colla- 

 boration with P. E. LINDAHL, E. NORDLING, R. L. BRATTSAND, 

 N.-O. BODIN and L. O. THUNQVIST) 



ULRICH, H. Dr.phil., Prof. — Zool. Inst., Eidg. Techn. Hochschule, Uni- 

 versitatsstr. 2, ZURICH, Schweiz 



a. Action of X-rays on nucleus and cytoplasm of eggs, and on embryological 

 stages. Drosophila melanogaster (Diptera) 



b. Morphology, physiology and cytology of paedogenetic bisexual reproduc- 

 tive cycle. Oligarces paradoxus, Miastor metralous, Mycophila spec. 

 (Cecidomyidae, Diptera) 



126 



