a Development of interactions between pituitary, pineal, and gonads in vitro. Mus 



musculus (Rodentia) 

 b Induction of kidney tubules in metanephrogenetic mesenchyme. Mus musculus, Rattus 



norvegicus (Rodentia) 

 c In vitro response of fetal Leydig cells to purified follicle stimulating hormone; loss 



of this response during postnatal development in relation with maturation of hypo- 

 thalamic neurones controlling the secretion of interstitial cell stimulating hormone. Same 



species as b 

 d Presence in the embryonic male gonad of As-3/3-hydroxysteroid dehydrogenase at the 



initial steps of testis morphogenesis; later apparition of this enzyme in the well differentia- 

 ted ovary; possible effects of an inhibitor of the enzyme at different developmental 



stages. Same species as a 

 LOMBARDO, F. Dr.Biol.Sci. — 1st. di Anat. Comp., Univ. di Modena, Via Berengario 14, 



41100 MODENA, Italy 

 a Regeneration of the retina in young animals. Carassius auratus (Teleostei) 

 b Regeneration of neural retina. Lacerta muralis, L. viridis (Lacertilia) 

 LONDON, J. M.Sc. — Dept. of Embryol. and Teratol., Tel-Hashomer Hosp., TEL-AVIV, 



Israel 

 LONGENECKER, B. M. Ph.D. — Dept. of Zool., Fac. of Sci., Univ. of Alberta, EDMON- 

 TON, Alta., Canada 

 LONGO, F. J. Ph.D. — Dept. of Anat., Med. Units, Univ. of Tennessee, 800 Madison Ave., 



MEMPHIS, Tenn. 38103, U.S.A. 

 a Effect of meiotic state at moment of insemination on pronuclear development and 



association (light and electron microscopy). Asterias forbesi (Asteroidea) , Spisula solidis- 



sima, Mytilus edulis (Lamellibranchia) 

 b Effect of maternal cytoplasm on pronuclear development and association. Arbacia punctu- 



lata, Lytechinus variegatus (Echinoidea) 

 c Effect of supernumerary male and female pronuclei on pronuclear development and 



association, i.e., investigation of heteroploidy, polyandry and polygyny. Spisula solidis- 



sima (Lamellibranchia) , Oryctolagus cuniculus (Lagomorpha), Mus musculus, Rattus 



norvegicus (Rodentia) 

 LOOMIS, W. F., Jr. Ph.D. — Dept. of Biol., Univ. of California, San Diego, P.O.Box 109, 



LA JOLLA, Calif. 92037, U.S.A. 

 a A biochemical and genetic investigation of the mechanisms of development. Dictyostelium 



discoideum (Acrasiales) 

 LOPASHOV, G. V. Dr.biol.sci., Prof. — Inst, of Developm. Biol., Acad, of Sci. of the 



U.S.S.R., Vavilov St. 26, MOSCOW 117133, U.S.S.R. • 



a Inductive interactions of the cells in differentiating retina by means of combinations of 



cells of the eye rudiment and the gastrula ectoderm. Rana temporaria (Anuta), Gallus 



domesticus (Aves) (with O. A. HOPERSKAYA) 

 b Metaplastic potencies of embryonic and larval eye for lens and retina regeneration. 



Leuciscus bergi, Anoptichthys jordani (Teleostei) (with A. A. SOLOGUB) 

 c Stimulation of metaplasia of the pure pigmented epithelium of adults into retina by means 



of agents from larval (or embryonic) retina. Mus musculus (Rodentia) (with A. A. 



SOLOGUB) 

 d Determination of the site of formation of the falciform process by means of creation of 



additional choroid fissures. Leuciscus bergi (Teleostei) 

 e The influence of fractionated homogenates of some differentiating tissues (retina, muscle) 



on the differentiation of future ectoderm in uncleaved eggs and early stages of cleavage. 



Triturus taeniatus (Urodela) , Xenopus laevis (Anura), Gallus domesticus (Aves) (with 



L. A. NIKITINA) 

 LOS. }. A. M.D. — Anat.-Embryol. Inst., Univ. of Amsterdam, Mauritskade 61. AMSTER- 



DAM-O., Netherlands 

 a Light microscopy, electron microscopy, histochemistry, physiology, and experimental 



teratogenesis of heart development in the embryo. Gallus domesticus (Aves), Mus musculus 



(Rodentia) (with H. M. LAANE and J. A. ROEST) 

 LOSEVA, Mrs. L. M. — Dept. of Embryol., Leningrad State Univ., Mendeleevsky St. 5, 



LENINGRAD V-164, U.S.S.R. 

 a Oogenesis and embryonic development. Tealia crassicornis, Metridium senile, Bunodactis 



LOUVET, J.-P. Dr.Biol.anim. — Lab. de Zool. Exper., Univ. de Bordeaux I, Av. des 



Facultes, 33 TALENCE, France 

 a Recherches descriptives et experimentales sur la formation de la bandelette embryonnaire. 



Carausius spec. (Phasmida) 

 b Neurogenese. Same species as a 



c Ultrastructure du developpement des pleuropodes. Same species as a 

 LOVE, D. Ph.D. — Dept. of Anat., Developm. Biol. Center, Case Western Reserve Univ. 



2119 Abington Rd., CLEVELAND, Ohio 44106, U.S.A. 

 a Chemistry of developing muscle. Gallus domesticus (Aves) 



111 



