Nieuwkoop 69 OB 



h. The influence of the Li ion on the development of the larval (trocho- 

 phore) and adult organ systems (segments). Nereis limbata (Annelida) 

 NIGTEVEGHT, G. van — Hubrecht Lab., Internat. Embryol. Inst., Jans- 

 kerkhof 2. UTRECHT, Holland 

 a. Spreading of neural activation in competent ectoderm in explants. 

 (Urodela) 

 NIJENHUIS, E. D. M.Sc. — Zool. Lab. der Rijks Univ.. Janskerkhof 3, 

 UTRECHT. Holland 

 a. Analysis of the phase specificity in the sensitivity of the egg te Li-ions. 

 Limnaea stagnalis (Gastropoda) 

 NILSSON, Miss A. E. A. Fil.Mag. — Inst, for Zoophysiol., Uppsala Univ.. 

 UPPSALA. Sweden 

 a. The mechanism of agglutination of spermatozoa. (Mammalia) 

 NISHIITSUTSUJI. Miss J. — Lab. of Embryol. and Exper. MorphoL. Zool. 

 Inst., Dept of Sci., Kyoto Univ.. KYOTO, Japan 

 a. Hormonal mechanism of metamorphosis. Bombyx mod, Luehdorfia 

 japonica, Philosamia cynthia ricini (Lepidoptera) (in collaboration with 

 M. ICHIKAWA) 

 NIU. M. C. Dr — Dept of Biol. Sci., Stanford Univ.. STANFORD. Cal., 

 U.S.A. 



a. The differentiation of macrophages into melanophores following their 

 ingestion of pigmentary debris released by degeneration of preexisting 

 melanophores. (Amphibia) (in collaboration with V. C. TWITTY) 



b. The migratory behaviour of single neural crest melanoblasts isolated in 

 capillary tubes of extremely small bore. (Amphibia) (in collaboration 

 with V. C. TWITTY) 



c. The role of mesodermal cells in epidermis formation. (Amphibia and 

 Mammalia) 



NUESCH. H. DrSc. P.D. — Zool. Anstalt der Univ., Rheinsprung 9. 

 BASEL. Schweiz 



a. Einfluss des Nervensystems auf die Entwicklung anderer Organe. Telea 

 polyphemus (Saturnidae, Lepidoptera) 



b. Entwicklung der imaginalen Muskeln. Telea polyphemus (Saturnidae, 

 Lepidoptera) 



NYHOLM. K. G. Fil.Dr — Zool. Inst., Uppsala Univ., UPPSALA, 

 Sweden 



a. Study of the development. (Echinodeddae, Aschelminthes) 



b. Study of the development. Labidoplax buskii (Echinodermata) 



c. Study of the life-history of monothalamous forms. (Rhizopoda) 

 O'BRIEN, B. R. A. — Dept of Histol. and Embryol, Univ.. of Sydney, 



SYDNEY. N.S.W.. Australia 

 a. Ezymatic pattern in normal and regenerating tissue in relation to capacity 

 for. and rate of regeneration. (Annelida) 

 O'BRIEN. J. P. Ph.D. — Dept of Biol.. Marquette Univ.. 1217 West Wis- 

 consin Ave. MILWAUKEE 3. Wis., U.S.A. 



a. Regression of larval and adult limb and tail following exposure to X-rays 

 or denervation. Tdturus viddescens and Ambystoma punctatum (Uro- 

 dela) 



b. Spindle-cell sarcoma of adult animals. Triturus viridescens and Am- 

 bystoma punctatum (Urodela) 



