184 
NAUTILOIBEA. 
settle this question without a reference to the original specimen, 
and in the meanwhile it would not he advisable to adopt Montfort’s 
name Aganides so long as there is any uncertainty about the type 
specimen h 
TRIASSIC SPECIES. 
Nautilus privatus, Mojsisovics. 
18S2. Nautilus privatus, Mojsisovics, Die Cephalopoden der Mediter- 
ranen Triasprovinz (Abhandl. der k.-k. geol. Reichsanst. Baud x.), 
p. 284, Taf. xc. ff . 3 a, 3 b. 
Sj). Char. Shell thick, involute, subquadrangular in section, con- 
sisting of about two whorls, about half of the inner being concealed 
by the outer one. Sides and periphery flattened, the latter narrower 
than the dorsal side. Umbilicus rather large, measuring one inch in 
a shell whose diameter is three inches and a quarter. Septa nume- 
rous, about twenty to a whorl, the sutures strongly bent backwards 
on the sides of the shell, nearly straight upon the periphery. An 
internal lobe is present. Siphuncle situated below the centre. 
Test smooth ? 
Remarls. This species is distinguished from N. qiiadranguliis, 
Bey rich by the more rapidly increasing whorls (both in thickness 
and height) and the blunter margins of the umbilicus. The septa 
also appear to be more numerous in the present form. 
Horizon. Upper Muschelkalk (zone of Ceratites trinodosus). 
Locality. Schrcyer Alpe, Gosauthal, near Hallstadt, Upper Austria. 
Represented in the Collection by a single example. 
Nautilus Suessi, Mojsisovics. 
1873. Nauiihis Suessi, Mojsiso\dcs, Das Gebirge um Hallstatt (Abhaudl. 
der k.-k. geol. Reichsanst. Band vi.), p. 26, Taf. vi. ff. 11, 
Taf. xiii. ff . 2 «, 2 h. 
Sjp. Char. Shell inflated, compressed on the sides, narrowly 
truncated on the periphery, the whorls being thus triangular in 
section ; their greatest width is in the region of the umbilicus ; the 
latter is very small. The periphery is shallowly concave and 
bordered by two prominent ridges. The septa are .approximate, 
the sutures are slightly bent on the sides of the shell, and form 
a shallow backwardly directed sinus in crossing the periphery. 
The ornaments of the test consist of a series of regular, widely 
1 See remarks on tbe name Aganides by Meek (too long for insertion here), 
United State.s Geol. Surv. Terr. vol. ix. 1876, p. 494. 
2 Cephalopoden aus dem Muschelkalk der Alpen, in Abhandl. d. k. Akad. 
d. Wiss. zu Berlin, 1866, p. 137, Taf. iii. f. 5. 
