2. A celebrated anatomist, who lived probably about the third century B. C., as Galen calls him a contemporary of Herophilus and Erasistratus. (Comment. in Hippocr. " Aphor." 6.1, vol xviii. pt. 1. p . 7.) He appears to have given particular attention to the anatomy and physiology of the nervous system. (Galen, de Locis. Affect. 3.14, vol. viii. p. 212.) He considered the metacarpus and metatarsus each to consist of five bones (Galen, de Usu Part. 3.8, vol. iii. p. 203 ), on which point Galen differed from him, but modern anatomists agree with him. He, however, fell into the error of supposing the acromion to be a distinct and separate bone. (Rufus Ephes. de Appell. Part. Corp. Hum. p. 29.)