John P Trinkaus' MBL Embryology Course Notes, Notebook II, 1939. Page 63

Notes from William Ballard's lecture. Trinkaus continues his notes on the embryology of Styela with information on fertilzation (includes two diagrams)Lecturer: W. W. Ballard, Lecture "General Embryology of Tunicates" (Information taken from the 1939 Embryology Course Book)Page 63 of 72 from the second notebook of lecture and laboratory notes that John P. Trinkaus took during his time as a student in the Marine Biological Laboratory Embryology Course in 1939 in Woods Hole, MANote