Page:Eurypterids of the Devonian Holland Quarry Shale of Ohio.djvu/9

 {| align="center" width="700px" . 35. Holotype of Pterygotus (Pterygotus) carmani, n. sp., PE5105. Part of a chelicera; natural size. . 36. Paratype of Pterygotus (Pterygotus) carmani, n. sp., PE5106. Part of a chelicera; ✕ 2. . Paratype of Pterygotus (Pterygotus) carmani, n. sp., PE5107. The fixed ramus of a chelicera; ✕ 2. . 38. Composite of known parts of chelicera of Pterygotus (Pterygotus) carmani, n. sp.; natural size.
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The gnathobase of the coxa of the swimming legs (figs. 39, 40) comprises a row of triangular, curved teeth, progressively smaller from anterior to posterior. A complete gnathobase (fig. 40) reveals that the anterior tooth is largest, and that 13 teeth are present. Another, but larger, gnathobase (fig. 39) is incomplete and lacks the anterior two teeth. The width of the gnathobase illustrated (fig. 40; specimen PE5109) is 20.3 mm.; the first tooth is 3.5 mm. in length