KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 49. N:Q 4. 



13 



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Fig . 3 _ Sections through the ectodermic invagination (= the primary amniotic cavity) and the hydrocoele hoop, every 

 other section having been drawn ; highly magnified. Naraes as before; in addition, s., stone-canal. 



K. Sv. Vet. Akad. Handlingar. Band 49. N:o 4. 



2* 



