126 



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 endothelia, 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 



11 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 General subjects 



b Primordial germ cells 



c Gameto-. ovo- and spermatogenesis 



d Maturation 



e Ovulation and oviposition 



f Activation and fertilization 



g Parthenogenesis 



5 Cleavage and mitosis 

 a Cleavage 



b Mitosis 



6 Further development of Invertebrates 



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

 EV Evcrtebrata 

 P Protista 

 A Porifera 

 B Coelenterata 



C Vermes and Onychophora, Tardigrada and Linguatuhda 

 D Arthropoda 

 E Mollusca 



