330 
J^ArXILOIDEA. 
Nautilus, sp. 
Several worn fragments of a small Nautilus, too imperfect for 
specific determination, may be thus briefly described : — Shell inflated, 
rapidly expanding, very slightly flattened on the sides, broadly 
rounded on the periphery. Umbilicus open, with steep sides. Septa 
approximate, very slightly flexuous on the sides, nearly straight in 
crossing the periphery. Body-chamber, siph uncle, and test un- 
known. 
The specimens described were collected by ^Ir. W. K. Loftus in 
the “ Nummulitic Series” of Tertiary Bocks (Eocene?) on the 
Turko-Persian frontier h The deposit containing them is thus 
described by Mr. Loftus : — “ Yellowish calcareous marl, abounding 
with fossils ; the lower part with Alveoli ua snhpifrenaica in parti- 
cular The number of fossils procured from tliis bed (Xo. fl 
of the Kirrind limestone) was between 70 and 80 species. This 
bed does not exceed 30 feet in thickness. The lower portion being 
more argillaceous than the upper, the fossils, chiefly Nummulites 
Biaritzensis and Alveolina subjiy renaica , ore easily detached.” 
Other fossils were also found in this bed in great numbers, chiefly 
molluscs, but also Echinoderms, Crustacea, and a few fragments of 
fish-remains. 
Horizon. Tertiary (Eocene ?). 
Locality. Kirrind, Persia. 
Nautilus decipiens, Michelotti. 
1861. Nautilus decipiens, Michelotti, Etudes siir le Miocene Inf^rieur 
de ITtalie Septentrionale, p. 137, pi. xiii. f. 11. 
1872. Nautilus decipiens, Bellardi, 1 Molluschi dei Terreui Terziari del 
Piemonte e della Liguria, pt. i. p. 21. 
1889. Nautilus decipiens, Benoist, Coquilles Fossiles des Terrains Ter- 
tiaries Moyens dii Sud-ouest de la France, Actes de la Soc. 
owing to a well-marked physical division, may be divided into two parts, the 
white and the brown beds, the latter being the higher member of the group. 
The lower, or white beds, are said by Dr. Figari Bey (Studi scientifici sull’ 
Egitto, vol. i. p. 136) to rest upon tufaceous and slightly argillaceous lime- 
stone, representing the upper part of the Cretaceous formation.” (“ On the 
occurrence of Celestine in the Nummiditic Limestone of Egypt.” By H. 
Bauerman and 0. Le Neve Foster, Quart. Journ. G-eol. Soc. vol. xxv. 1869, 
p.40.) 
^ “ On the Geology of the Turko-Persian Frontier, and of the Districts 
adjoining,” by W. K. Loftus (Quart. Journ. Geol. Soc. 1855, vol. xi. p. 247). 
