186 
NAUTILOIDEA. 
and flattened or truncated in the adult. I have already compared 
Nautilus Suessi, Mojs., with this species. 
Horizon. Upper Aluschelkalk. 
Locality. Not recorded, but probably Hallstadt. 
Represented in the Collection by a single example. 
Nautilus Simonyi, Fr. v. Hauer. 
1849. Nautilus Simony i, v. Hauer, Neue Ceph. v. Hallstatt und Aussee, 
in Haidinger’s Naturwiss. Abhandl. Band iii. p. b, Taf. i. ff. 1’1-14. 
1866. Nautilus Simonyi, Dittmar, Ziir Fauna der Hallstadter Kalke 
(geogn.-palaont. Beitrage, Band i. Heft iib.), p. 342, 
1873. Nautilus Simonyi, Mojsisovics, Das Gebirge um Hallstatt 
(Abhandl. der k.-k, geol. Reichsanst. Band vi.), p. 29. 
? 1873. Nautilus modestus, Mojsisovics, ibid. p. 29, Taf. xv. ff. 2 a, 2 h. 
Sp. Char. Shell somewhat compressed on the sides, narrowlj' 
rounded on the periphery. Umbilicus very small. Septa approxi- 
mate, sutures very slightly curved backwards on the sides of the 
shell, and forming an inconspicuous sinus upon the periphery. 
Siphuncle very near the dorsal (inner) margin. Test marked only 
with lines of growth, 
Remarhs. This species is very closely allied to, if it is not indeed 
identical with, N. modestus, Mojs. {loc. cit.), but the latter, accord- 
ing to Mojsisovics, is a more rapidly increasing shell, with a higher 
aperture. From the appearance of Alojsisovics’s figure of modestus 
it seems quite possible that the individual described may have been 
abnormally compressed, and as it agrees in every essential character 
with Simonyi, I have placed it provisionally in the synonymy of 
the latter. 
Horizon. Upper Muschelkalk. 
Locality. Near Hallstadt. 
Nautilus linearis, Munster, sp. 
1841. Cyrtocera? linearis, Miinster, Beitrage zur Geognosie imd Petre- 
factenkunde des siidostl. Tirol, p. 1 25, Taf. xiv. ff. 5, a, h. 
1849. Nautiloceras linearis, d’Orbigny, Prodr. de Paleont. Stratigr. 
vol. i. p. 179. 
1869. Nautilus tertius, La^ube, Fauna der Schichten von St. Cassian 
(Denkschr. der k.-k. Akad. d. Wiss. Band xxx.), p. 58, Taf. xxxvi. 
f. 4. 
1 873. Nautilus linearis, Mojsisovics, Das Gebirge um Hallstatt (Abhandl. 
der k.-k. geol. Reichsanst. Band vi.) p. 14, (footnote). 
? 1882. Nautilus linearis, Mojsisovics, Die Cephalopoden der Alediter- 
ranen Triaspiovinz (Abhandl. der k.-k. geol. Reichsanst. Band x.), 
p. 287, Taf. Ixxxiii. f. 5. 
