KOFOID: DEVELOPMENT OF LIMAX. Ill 



ADDENDUM. 



Since the completion of the preceding pages, Crampton's paper on 

 Reversal of Cleavage in a Sinistral Gasteropod (Annals X. Y. Acad. 

 Sci., Vol. VIII. pp. 167-169, Plate V, March, 1895) has been received. 

 Crampton has followed the cleavage of Physa heterostropha through 

 the twenty-four-cell stage, and a reversal of the direction of the spiral 

 is indicated for every cleavage. 



Ann Arbor, Mien., June 24, 1895. 



