KOFOID: DEVELOPMENT OF LIMAX. 111 
ADDENDUM. 
Since the completion of the preceding pages, Crampton's paper on 
Reversal of Cleavage in a Sinistral Gasteropod (Annals N. 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 Annon, Micu., June 24, 1895. 
