428 EMBRYOLOGY OF THE LOWER VERTEBRATES ch. vi 



McClure. Anat. Record, ix, 1915. 



Maurer. Morph. Jahrb., xiv, 1888. 



Mollier. Hertwigs Handbuch der Entwicklungslehre, i, 1906. 



Miiller. Abhand. Akad. "VVisa. Berlin, 1845. 



Miiller, F. W. Arch. mikr. Anat., xlix, 1897. 



O'Donoghue. Proc. Zool. Soc. Lond., 1912. 



Purser. Quart. Journ. Micr. Sci., Ixii, 1917. 



Rabl, C. Leuckarts Festschrift. Leipzig, 1892. 



Rabl, H. Arch, mikr' Anat., lxix, 1907. 



Eidewood. Proc. Zool. Soc. Lond., 1899. 



Eobertson. Quart. Journ. Micr. Sci., lix, 1913. 



Rose Morph. Jahrb., xvi, 1890. 



Riickert. Biol. Centralblatt, viii, 1888. 



Riickert. Hertwigs Handbuch der Entwicklungslehre, i, 1906. 



