Publisher's Synopsis
Excerpt from On Urnatella Gracilis
I cannot close this introduction without expressing thanks to my friend Mr. Potts, who, filled with love for the science, has unselfishly supplied me with material, hospitably received me into his household during my stay in Pennsylvania, and worked with me beyond his strength in our dredging operations on the Schuylkill in order to further a study of this animal.
The later studies included in this paper were made in the Embryo logical Laboratory, under the direction of Dr. E. L. Mark.
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