96 DEVONIAN FAUNA. 
rounded sides, truncated by a small foramen which is close to apex of dorsal 
valve. Muscular impressions very near the beak in ventral valve. 
Locality.—A single specimen from Lummaton is in my Collection. 
Size.—Length 55 mm., width 65 mm., depth 30 mm. 
Remarks.—This shell is distinguished from others that occur at Lummaton by 
its small overhanging beak with rounded sides, and by the even convexity of its 
ventral valve. The specimen may perhaps be somewhat crushed, but it appears 
to differ from all the accompanying shells. From specimens in the British 
Museum Mr. B. R. Newton and I came to the conclusion that it closely resembled 
M. Archiaci, Suess, but whether it is identical or even congeneric with it is very 
doubtful. 
Barrois, in his ‘ Fauna Cale. d’Erbray,’ gives some good figures of M. inornata, 
which he separates from the true M. Archiaci, de Vern.’ I think his shell probably 
agrees with ours. In his ‘Terrains Anc. Asturias’” he had referred to both 
species under the same name. 
M. Archiaci, as given by Schuur,’ which can hardly, I think, be the same 
species as the present shell, agrees with de Verneuil’s species. 
Il. Family.—Strincocernaripm, King, 1850. 
1. Genus.—Srrincocernaws, Defrance, 1827. 
1. SrrincocerHatus Bortini, Defrance. Pl. XII, figs. 2, 2a. 
1827. StryGocErrHatus Burin, Defrance. Dic. Sci. Nat., vol. li, p. 102, pl. Ixxv, 
figs. 1, La. 
1864. SrrincocerHatus Burrini, Davidson. Brit. Foss. Brach., vol. iii, pt. 6, 
p-. 11, pl. i, figs. 18—22, and 
pl. ii, figs. 1—11. 
1882. — —_ Davidson. Ibid., vol. v, pt. 1, p. 19, pl. iii, 
figs. 2, 3. 
1885-9. -- — Maurer. Abhandl. Grossh. Hessisch. Geol. 
Landes., vol. i, pt. 2, p. 221, pl. ix, 
figs. 13, 14. 
1890. _ — Whiteaves. Trans. Royal Soc. Canada, vol. viii, 
sec. 4, p. 93, pl. iv, figs. 1—9. 
1891. —_— — Whiteaves. Contrib. Canad. Palzont., vol. i, 
pt. 8, p. 235. 
1 1850, De Verneuil, ‘Bull. Soc. Géol. Fr.,’ vol. vii, p. 175, pl. iv, fig. 2; 1878, Bayle, ‘ Expl. 
Carte Géol. Fr.,’ pl. x, figs. 6—9; and 1886, Ghlert, ‘ Ann. Sci., Géol.,’ vol. xix, p. 20, pl. ii, figs 1—8. 
2 1882, Barrois, ‘Mém. Soc. Géol. Nord,’ vol. ii, p. 273. 
8 1854, Schnur, ‘ Paleontographica,’ vol. iii, p. 191, pl. xxvii, figs. 2 a—e. 
