LASH, J. W. — Dept. of Anat., Sch. of Med., Univ. of Pennsylvania, PHILADELPHIA Pa 



19104, U.S.A. # ' 



LA SPINA, Miss R. D.Sci. — 1st. di Zool., Univ. di Palermo, Via Archirafi 18 90123 



PALERMO, Italy 

 a Fine structure of unfertilized eggs and egg fragments. Ascidia malaca (Ascidiacea) 

 b The analysis of the colour pattern. Discoglossus pictus (Anura) 

 LASSAU, J. P. — Lab. d'Anat., Univ. Paris V — Rene Descartes, 45 rue des Saints Peres 



75 PARIS Vie, France 

 a Croissance de la vulve. Homo sapiens (Primates) 

 b Organogenesis and morphogenesis of biliary ducts. Same species as a 

 LATSHAW, W. K. Ph.D., Prof. — Dept. of Vet. Anat., Western Coll. of Vet. Med Univ 



of Saskatchewan, SASKATOON, Sask., Canada 

 a Closure mechanisms of optic fissure. Gallus domesticus (Aves), Mus musculus, Mesocri- 



cetus auratus (Rodentia) 

 LAUFER. H. Ph.D., Prof. — Biol. Sci. Group, Sect, of Developm. Biol., Univ. of Connecticut 



Life Sciences Bldg. U-42, STORRS, Conn. 06268, U.S.A. • 



a Effects of hormones on gene action as revealed by puffing of polytenic chromosomes. 



Chironomus spec. (Diptera) 

 b Regulation of metamorphosis by hormones. (Insecta) 

 c Regulation of yolk proteins, enzymes, salivary gland secretion proteins, and hemoglobins 



during metamorphosis. (Crustacea; Insecta) 

 LAUGfi, Miss G. Dr.es Sci. — Lab. d'Entomol. et d'Ecol. Exper., Centre d'Orsay, Univ. 



Paris-Sud, 91 ORSAY, France 

 a Experiments on determination and differentiation of genital apparatus, triploid intersexes. 



Drosophila melanogaster (Diptera) 

 b Cytology of agametic gonads after U.V. irradiation during the polar cells stage. Same 



species as a 

 c Modifications of gonad development by thermal stress. Same species as a 

 LAVALLE, D. B.Sc. — Dept. of Gen. Biol., Inst, of Biol. Sci., Fed. Univ. of Minas Gerais, 



Rua Carangola 288 — 4°andar, C.P. 253, BELO HORIZONTE, M.G., Brazil 

 a DNA content and nuclear size in somatic and germinal tissues and the differentiation of 



tissues related to the ratio DNA/nuclear size; somatic polyploidy in some tissues. Bufo 



paracnemis (Anura) 

 LAVARACK, J. O. Ph.D. — School of Anat., Univ. of Melbourne, PARKVILLE 3052, 



Vict., Australia 

 a Histochemistry of cell interactions in the development of primary tissues. Gallus gallus 



(Aves) 

 LaVELLE, A. Ph.D., Prof. — Dept. of Anat., Coll. of Med., Univ. of Illinois P.O.Box 6998, 



CHICAGO, 111. 60680. U.S.A. 

 LAVELLE, C. L. B. Ph.D. — Dept. of Oral Pathol., Dental School. St. Mary's Row, 



BIRMINGHAM B4 6NN, England 

 a Embryology of the skull and of dental cusp pattern. Rattus norvegicus (Rodentia) , Homo 



sapiens (Primates) 

 LaVELLE (WILSON) , Mrs. F. Ph.D. — Dept. of Anat., Univ. of Illinois, P.O.Box 6998, 



CHICAGO, 111. 60680, U.S.A. 

 LAVERDURE, Miss A.-M. — Lab. de Biol. Anim., Fac. des Sci.. Univ. Paris Sud, 91 



ORSAY, France 

 a Differenciation de la gonade femelle et vitellogenese. Tenebrio molitor (Coleoptera) 

 LAWRENCE, A. J. Ph.D. — Dept. of Cell Biol., Univ. of Glasgow, GLASGOW W.2, 



Scotland, U.K. 

 LAWRENCE, I. E. Jr. Ph.D.. Prof. — Dept. of Biol., East Carolina Univ., Box 2577, 



GREENVILLE, N.C. 27834, U.S.A. 

 a Comb development. Gallus domesticus (Aves) 



1. Development of the feathered crest fowl's comb primordium in an experimentally 

 altered position. 



2. Histochemical patterns and hormonal influence on comb tissue development. 



3. Electrophoretic analysis of comb protein. 



4. Changing patterns in development of the normal single comb between 4J/£ and 9 days 

 incubation. 



5. Analysis of the epidermal-dermal junction in reciprocal 8 day comb and non-comb 

 tissue grafts. 



6. Analysis of comb tissue interactions in graft recombinations (heteroplastic combina- 

 tions of dermis and epidermis) of the wyandotte (dominant rose comb) and the white 

 leghorn (recessive single comb). 



b Comb and beak malformation resulting from removal of neural crest between stages 7-9. 



Gallus domesticus (Aves) 

 LAWRENCE, P. A. Ph.D. — Lab. of Molec. Biol., Med. Research Council. Hills Rd.. 



CAMBRIDGE CB2 2QH, England 

 a The development of bristles; in particular factors controlling their position and their 



initiation. Oncopeltus fasciatus (Heteroptera) 

 b Developmental genetics. Oncopeltus fasciatus (Heteroptera) 



105 



