John P Trinkaus' MBL Embryology Course Notes, Notebook I, 1939. Page 43

Notes from William Ballard's lecture. Trinkaus continues his notes on different developmental patterns of coelenterates from page 42.Lecturer: W.W. Ballard, Lecture "General Embryology of the Hydrozoa." (Information taken from the 1939 Embryology Course Book)Page 43 of 113 from the first 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