ASEXUAL CYCLE OF PLANARIA VELATA. 203 



'i3b Certain Dynamic Factors in Experimental Reproduction and their 



Significance for the Problems of Reproduction and Development. Arch. 



f. Entwickelungsmech., Bd. XXXV., H. 4. 

 '130 Studies, etc., VI. The Nature of the Axial Gradients in Planaria and 



their Relation to Polarity and Symmetry. Arch. f. Etwickelungs- 



mechanik, Bd. XXXVII., H. i. 

 Minot, C. S. 



'08 The Problem of Age, Growth and Death. 

 Stringer, Caroline E. 



'og Note on Nebraska Turbellaria, with Descriptions of two New Species. 



Zool. Anz., Bd. XXXIV., No. 9. 



