@article{oai:repository.dl.itc.u-tokyo.ac.jp:00037773, author = {Yatsu, Naohide}, journal = {Journal of the College of Science, Imperial University of Tokyo}, month = {Apr}, note = {application/pdf}, pages = {1--21}, title = {Observations and Experiments on the Ctenophore Egg : 1. The Structure of the Egg and Experiments on Cell-division}, volume = {32}, year = {1912} }