123 



e air-bladder 



8 Heart, vascular system and blood 



a general subjects 

 b heart 

 c/d arterial and venous system 

 e capillary system 

 f blood 



9 Coelomic cavities and cndothelia, lymphatic system and connective tissue 

 a/b coelomic cavities and endothelia 



c lymphatic system 

 d connective tissue 



10 Urogenital system and sex determination 

 a general subjects 



b/c kidney and urinary ducts 

 d/e/f gonads (ovary and testis), genital tracts and accessory glands 

 g sex determination 



1 1 Endocrine glands 

 a general subjects 

 b hypophysis 



c thymus 



d thyroid gland 



e gonads 



f adrenals 



g pancreas 



1. DESCRIPTIVE AND COMPARATIVE EMBRYOLOGY 



SUBDIVISION 



1 Theoretical problems 



2 Methods and technics 



3 General subjects (asexual development, etc.) 



4 Initial development 



a Primordial germ cells 



b Gameto-, ovo- and spermatogenesis 



c Maturation 



d Ovulation and oviposition 



e Activation and fertilization 



f Parthenogenesis 



g General subjects 



5 Cleavage and mitosis 

 a Cleavage 



b Mitosis 



6 Further development o[ Invertebrates 



(including complete and partial — e.g. early — development) 

 EV Evertebrata 

 P Protista 

 A Porifera 

 B Coelenterata 



C Vermes and Onychophora, Tardigrada and Linguatulida 

 D Arthropoda 

 E Mollusca 



