Notes from Donald Costello's lecture. Trinkaus begins with notes on the history of research on the embryology of crustacea, including Mueller and Haeckel, including a small phylogeny of crustaceans, and some notes on the general embryology of the cladeLecturer: D. P. Costello, Lecture "The Embryology of Crustacea" (Information taken from the 1939 Embryology Course Book)Page 44 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, MA