238 
NAUTTLOIDEA. 
from each other where the height of the whorl is 2 inches. Sutures 
strongly arched forward after leaving the umbilicus, then sweeping 
backward in a larger curve, and again forward towards the peri- 
phery, which they cross without forming any sinus. Siphuncle 
situated a little below the centre. 
Remarhs. “ This species was long confounded with another from 
a higher horizon (the Tithonian), afterwards designated by Oppel 
Franconicus^. The present species is now restricted to a form 
found in the Eisenoolith of Villecomte in Lothringen (Lorraine) “. 
N. agariiticus is easily distinguished from X. Franconicus by its 
much more inflated form, rounded periphery, somewhat less flexuous 
sutures, and the position of its siphuncle. In its general form, 
especially in the rounding of the periphery, this species hears a 
much closer resemblance to Nautilus {Hercoglossa) Portlandicus^ 
which, however, differs in the form of its sutures. . . .” (Foord 
and G. C. Crich.) 
Horizon. Inferior Oolite (^liddle Brown Jura). 
Localit]i. A'illecomte, Lothringen. 
Nautilus (Hercoglossa) Franconicus, Oppel. 
1832. Nautilus aganiticus ?, Broun, in Leonhard & Bronn’s Jahrhucli 
fiir Mineralogie &c. p. 70. 
1837. Nautilus aganiticus, von Buch, Ueber den Jura in Deutschland 
(Akad. der Wissensch.), p. 119. 
1849. Nautilus aganiticus, Quenstedt, Die Cephalopoden, p. 58, Tab. ii. 
f. 6. {Not of Schlotheim.) 
1865. Nautilus Francojiicus, Oppel, Die Tithonische Etage, Zeitschr. 
der Deutsch. geol. Gesell. Band xvii. p. 546. 
? 1865. Nautilus Stra^nhergensis, Oppel, ibid. 
? 1868. Nautilus Strambergensis, Zittel, Die Cephalopoden der Strain- 
berger Schichten, in Oppel and Zittel’s Palaeontologische Mit- 
theilungen, Band i. Abth. ii. p. 42, Atlas, Taf. ii. ft’. 8-11. 
1870. Nautilus aganiticus, F. Roemer, Geologie von Oberschlesien, 
p. 252, Taf. xxiv. f. 6. 
1871. Nautilus cf. Sti'ambergensis, Herbich, Verb. ii. Mitth. des 
naturwiss. Vereines zu Herrmanstadt. 
1873. Nautilus Franconicus, Neumayr, Die Fauna der Schichten rait 
Aspidoceras acanthicum, Abhandl. der k.-k. geol. Reichsanst. 
Band v. Heft 6, p. 156. 
^ Oppel, “ Die Tithonische Etage,” Zeitschr. der Deutsch. geol. Gesell., Band 
xvii. 1865, p. 546. 
^ Zittel, “ Die Cephalopoden der Stramberger Schichten,” Palaeontologische 
Mittheilimgen, Band i. Abfli. ii, 1868, p. 43. 
