NAUTILID^. 
ol 
and, finally, the last whorl in the latter is separated from the rest, 
and this gives it, added to its other characters, quite the aspect of a 
Lituites^ to which genus de Yerneiiil referred it. 
Horizon. Etage 5 a (Bala Series ^). 
Locality. Herd, Norway. 
Represented in the Collection by a single imperfect example. 
Trocholites ? falcigerus, Eichwald, sp. 
18-57. Cifrtoceras falcigenun, Eichwald, Bull, de la Soc. des Natiira- 
listes de Hoscoii, p. 184. 
18G0. Cyrtoceras fcdcigerum, Eichwald, Lethaea Rossiea, vol. i. Seconde 
Section de I’ancienne Periode, p. 1287, tab. xlvii. ff. 6u, h. 
Sp. Char. Shell of medium size, a little compressed at the sides, 
and strongly curved, slowly increasing in diameter ; ornamented 
with large, distant, oblique, acute annulations, wider apart on the 
periphery, where they form a small and rather deep sinus, the inter- 
spaces showing only obscure lines of growth. The transverse sec- 
tion is elliptical in the type specimen, which is a fragment measuring 
1 inch 9 lines in length, the greatest dorso-vcntral diameter being 
10 lines, the least 7 lines. 
Remarl’s. The specimen in the British-^luseum Collection repre- 
senting this species is a fragment consisting of a portion of two 
volutions. It has at first sight the aspect of a Trochoceras, hut the 
internal position of the siphuncle excludes it from that genus. Its 
affinities cannot be certainly determined without better material. 
Horizon. Orthocerasi-lAm.Q?io\\e (=Arcnig). 
Locality. Esthonia, Russia. 
Represented in the Collection by a single example. 
Trocholites antiquissimus, Eichwald, sp. 
1840. Clymenia antiquissima, Eichwald, Schiclitensyst. von Esthland, 
p. li-5. 
1842. Clymenia antnjuissima, Eichwald, Die Urwelt Russlands, Heft 
ii. p. 33, tab.iii. fi’. 10, 17. 
1845. Clymenia antiqnimma, de Verneiiil, in IMurchison, de Verneuil, 
and de Keyserling’s Geol. de la Riissie d’Enro])e, vol. ii. pt. hi. 
p. .361. 
1849. Trocholites antiquisshnus, d’Orhigny, Prodr. de Paleont. vol. i. 
p. 5. 
^ For correlations of Scandinavian and British rocks see Kjerulf, Veiviser 
ved geol. excurs. i Christiania oinegn. (186.5) ; Murchison, ‘ Siluria,’ 5th ed., 
chap. xiv. (1872); J. E. Marr, Quart. Journ. Geol. Soc., Aug. 1882, p. 313. 
E 2 
