He is responsible for naming the genera Helopus (renamed Euhelopus because Helopus was already in use) and Tanius,[3] and the species Pentaceratops fenestratus[4] and Parasaurolophus tubicen.[5] He was also the first to suggest that the hollow cranial crests of lambeosaurine duckbill dinosaurs could be used as a horn-like noisemaker.[5] "Wiman's Law" states that the stolon of dendroid graptolites divides in groups of three: "one branch went into the bitheca, one into the autotheca, and one continued up along the stipe."[1]