1 
102 NAFTILOIDEA. 
1849. Nautilus hilohatus (pars), d’Orbigny, Prodr. de Paleont. Stratigr. 
vol. i. 
1852. Nautilus bilohatus (pars), Giebel, Fauna der Vorwelt, Baud iii. 
Abtb. i. p. 167. 
1854. Nautilus bilohatus (pars), Morris, Cat. of British Fossils, 2nd 
ed. p. 307. 
185*5. Nautilus hilohatus, M‘Coy, British Palaeozoic Fossils, fasc. iii. 
p. 556. 
? 1857. Nautilus ferratus, Cox, in D. D. Owen’s Third Eeport of the 
Geol. Surv. in Kentucky, for the years 1856 and 1857, vol. iii. 
p. 574, pi. X. ff. 2, 2 a. 
1860. Nautilus clitellarius (pars), Eichwald, Lethaea llossica, Seconde 
Section de I’ancienne Periode, vol. i. p. 1317. 
1861. Nautilus hilohatus, F. Roemer,* Zeitschr. der Deutsch. geol, 
Gesell. Band xiii. p. 695, Taf. xviii. tf. 1, 2. 
1874. Nautilus clitellarius, Trautschold, Xouv. Mem. Soc. Imp. des 
Xaturalistes de Moscou, vol. xiii. p. 302, pi. xxx. f. 4. 
1878. Nautilus bilohatus, de Koninck, Faune du Calcaire Carbouifere 
de la Belgique (Annales du Mus. Roy. d’Hist. Nat. de Belgique, 
tom. ii.), p. 92, pi. ix. ff. 1, a-c. 
1883. Ephippioceras clitellarium, Hyatt, Proc. Boston Soc. Nat. Hist, 
vol. xxii. p. 290. 
1888. Nautilus bilohatus, Tzwetaev, Cephalopodes de la Section sup^- 
rieure du Calc. Carb. de la Russie Centrale (Memoires du 
Comite Geologique [St. Petersbourg], vol. v. no. 3), p. 54, pi. v. 
m 23, 24. 
Sj). Char. “ Globose ; of two to three very rapidly enlarging 
whorls ; mouth very broad, transversely reniform, obtusely rounded 
at the sides ; greatest width of the shell at the edge of the umbi- 
licus ; periphery broadly rounded, with a nearly semicircular section, 
very slightly flattened at the middle ; umbilicus small, very deep, 
exposing about a third of the inner turns ; surface of the inner 
whorls marked with fine spiral striae, crossed by very fine trans- 
verse striae of growth (the spiral striae seem to disappear on the 
large specimens) ; septa very numerous, about two lines apart in 
the middle, at an inch and a half in width, one line apart at five 
lines in w'idth, their edges extending from the umbilicus towards 
the periphery, with a broad slight curve, the convexity backwards ; 
on reaching the middle third of the peri 2 )hery they abruptly bend 
forward with a tongue-shaped semiellipLical curve, extending so far 
forwards that a straight line, extending from the septum at the 
middle of the periphery to the umbilical edge of the same septum, 
would touch the middle of the following septal edge ; internal sur- 
face of each septum divided into two deep, rounded hemispherical 
pits, one on each side, separated by a narrow, very prominent, 
