Miaiitilus

Brcyn. capax . . Hall.

occidentalis Hall.

Lit.

Lit.

1868. Geol Surv. Illin. III.

1860. Rep. of Progr. Wisc.

jî. Rrpélitisns k.riimlale»

fi. Orthoceras

Breyn.

1868. J Hall. .!0' h . Ann. Rep. Reg.

angulation Wahl

annulation ? Sow.

1868. Geol. Surv. Illin. III.

Backi? . . Stok

1 868. Meek. Wirlhei.GevI. Snrr.Illii.

: crehristriatnui Wortli

1866. Geol. Surv. Illin. 1.

fusiforme . Hall

18H8. Freeman. Geol. Sirr. Illii. III

gregarium . Hall

1861. Rep. of Progr. Wisc.

Jolielense Worth. .

1866. Geol. Surv. Illin. I

5 Laphami M'Ches

. 1861. New. Pal. Foss.

sub-baculum Worlh

1866. Geol. Surv. Illin. I

Contrées de la grande zone septentrionale d’Amérique. 99

Orthoceras

(suile). I sp. . . . Worlh.

10 sp. . . . Worlh. .

,1 1 sp. . . . Worlh. . | .

12 sp. . . . Worlh. .

13 sp. . . . Worlh. .