00313nam a2200109Ia 4500008004100000040001100041100001900052245005400071260005300125300001500178300001000193251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aM. Abercrombie 0aJournal of Embryology and Experimental Morphology  cAugust, 1967bCambridge University PressaLondon  aP. 1-1-426  bV. 18