454 EMBEYOLOGY OF THE LOWEE VEETEBEATES ch.vii 



the hind end of the body continuing to sprout out past and dorsal to 

 the anal opening. It is of course conceivable that in phylogeny the 

 tail arose similarly as an outgrowth of the body dorsal to the anus 

 but this seems in every way less probable than the method of 

 evolution sketched above. 



LITERATURE 



Agar. Anat. Anzeiger, xxxiii, 1908. 



Balfour. Monograph on the Development of Elasmobranoh Fishes. London, 1878. 



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Rabl. Morph. Jahrb., xix, 1893. 



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Semon. Keibels Normentafeln, iii. Jena, 1901* 



Taylor. Quart. Journ. Micr. Sci., lix, 1914. 



