144 DEVONIAN FAUNA. 
1882. Onrnis srriatuLa, Barrois. Mem. Soc. Géol. Nord, vol. ii, p. 283. 
1883. — — Kayser. Richtofen’s China, vol. iv, p. 90, pl. iii, fig. 1. 
1885. — — Maurer. Abhandl. Grossh. Hessisch. Geol. Landes., 
vol. i, pt. 2, p. 133, pl. v, figs. 3, 4. 
1886. — — Wenjukof. Faun. Dev. Syst. N.W. und Central 
Russl., p. 465. 
1887. —  (ScHIzZOPHORIA) STRIATULA, hlert. In Fischer’s Manuel Conch., 
p. 1287, fig. 1055. 
1889. —  srRiatuta, Toll. Mém. Acad. Sci. St. Pétersbourg, ser. 7, vol. 
_ xxxvil, No. 3, p. 18, pl. i, figs. 10 a—d. 
1891. — — Whiteaves. Contrib. Canad. Paleont., vol. i, pt. 3, 
p. 218. 
Remarks.—I have nothing to add to the description of this shell. It does not 
appear very common at Lummaton, from which locality there are six specimens 
in the Torquay Museum, eight in my Collection, and two, which were figured by 
Davidson, in the British Museum. 
It falls under the genus or group Schizophoria, King, 1850. 
Orthis oblata, Hall," seems very similar, but its hinge and beak are apparently 
smaller. 
Orthis Penelope, Hall,’ is perhaps identical, but seems to have more definite 
transverse markings. 
O. Tulliensis, Vanuxem,* seems to be a more globose form. 
O. Iowensis, Billings,* is considered by H. 8. Williams*® and by Whiteaves as a 
western variety of this shell. 
2. Onruis? sp. Pl. XVII, fig. 5. 
Description.—Dorsal valve large, convex, circular, apparently bearing two large 
perpendicular dental plates. Surface with ten or twelve very low and. broad, 
close, rounded ribs, only discernible in the central parts, the whole surface being 
covered by about 150 minute, distant, elevated, rounded, radiating striz, which 
run rather irregularly, and are very unequal in size and occasionally divaricate. 
Size of valve.—About 25 mm. long, 27 mm. wide, and 9 mm. deep. 
1 1859, Hall, ‘ Pal. N. Y.,’ vol. iii, p. 162, pl. x, figs. 1—22. 
2 1860, Hall, ‘18th Report State Cab.,’ p. 79; and 1867, ‘ Pal. N. Y.,’ vol. iv, pt. 1, p. 50, pl. vi, 
figs. 2a—m. 
3 1843, Vanuxem, ‘ Geol. Rept. Third District N. Y.,’ p. 163. 
4 1859, Billings, in ‘ Hind’s Rept. Assinib. Saskatch.,’ p. 187, fig. 1 a. 
5 1889, H. S. Williams, ‘ American Geologist,’ vol. 111, p. 232. 
