pterygotus

[Pref. pteryg (o)-, and Greek ous (gen it. ōtos )=an ear.] Palæont .: A genus of Eurypteride. It has been restored by Dr. Henry Woodward. Anterior portion of the body with a carapace, having a pair of large compound eyes and a pair of minute larval ones. Five pairs of appendages beneath the carapace; the first pair chelate, and constituting the antennæ, the next three pairs spinous organs, and the last pair rowing organs. Besides the head there are thirteen free segments, counting the tel son as one. stichos a row, a line.] Entom.: The typical genus of Pterostichinæ.