 Sternberg sent some of his own specimens to German paleontologist Ferdinand <unk> at Munich University , although <unk> was not as prolific as Cope when it came to describing specimens . Cope 's rival Othniel Charles Marsh also collected some bones of Dimetrodon , which he sent to the Walker Museum . The first use of the name Dimetrodon came in 1878 when Cope named the species Dimetrodon <unk> , Dimetrodon <unk> , and Dimetrodon gigas in the scientific journal Proceedings of the American Philosophical Society . 
