Page:Eurypterids of the Devonian Holland Quarry Shale of Ohio.djvu/17

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KJELLESVIG-WAERING: DEVONIAN EURYPTERIDS
91

Fig. 46. Paddle of swimming leg of Dolichopterus asperatus, n. sp., paratype, PE5115. Shading indicates preserved patches of test. Ruled line, one centimeter.

 
Fig. 47. Distal end of paddle of swimming leg of Dolichopterus asperatus, n. sp., paratype, PE5116. Shading indicates preserved patches of test. Ruled line, one centimeter.


Family Stylonuridae Diener, 1924

Genus Syntomopterus, new genus

The prosoma is paraboloidal, very wide, straight along the base, and bordered with a wide marginal rim. The ventral shield is very narrow and band-like, and without sutures. The compound eyes, located slightly behind midsection, are crescentic, small, and close-set. The ocellar mound is located opposite the anterior part of the compound eyes. Ornamentation comprises large wart-like pustules, elongated and pointed at the margins.

Type species: Syntomopterus richardsoni, new species.

Remarks.—Syntomopterus differs greatly from other genera of the Stylonuridae. In some respects, particularly in the form of the ceph-