Cameron, A. E.2009-06-112013-01-042010-10-142013-01-041922-041922-04April 1922http://hdl.handle.net/10388/etd-06112009-111712The thesis is divided into four parts; 1.The implantation of the blastodermic vesicle, 2.The method of amnion formation in Citillus, 3.The anatomy and foetal membranes of a 25 mm. embryo, 4.The brain of a 9 mm. foetus.en-USCitellus richardsoniSpermophilus richardsoniiRichardson's ground squirreltext