XArTILlD,®. 
331 
Linn^enne de Bordeaux, s^r. o, vol. 4i. livr. i. p. 17, pi. i. 
ff. 2a, 2 6. 
Sp. Char. “ Shell discoid, compressed, back rounded ; septa dis- 
tant from one another, slightly undulated and sinuous ; aperture 
longer than wide; umbilicus very contracted.” (Michelotti.) 
Remarks. The specimens in the British Museum agree so well 
with the figure and description of Nautilus decipiens that there 
seems to be ample justification for referring them thereto. Both 
the specimens are casts, but they exhibit the general form of the 
shell as described by Michelotti — the small umbilicus and the widely 
spaced, slightly flexuous septa. 
One of them (Xo. C. 490) exhibits three or four distant, strong, 
transverse plications on the periphery, extending a little way down 
the sides of the shell ; the test would appear therefore to have been 
coarsely ribbed. These ornaments (if such they be) are not re- 
ferred to by Michelotti. 
In a report by Edward Eorbes on a collection of Tertiary fossils 
from Malta and Gozo, collected by Lieut. Spratt, R.N.\ mention is 
made of “ Two species of Nautilus, one of which is the Nautilus 
zigzag identical with the London Clay fossil.” 
Dr. Leith Adams in a paper read before the Geological Society, 
refers to the “ fragments of a Nautilus” having been found in the 
Marl beds of Malta, and in a later communication to the same 
Society ^ he mentions “ casts of Nautilus ” from the Marl bed. 
Horizon. Miocene. 
Locality. Malta. 
Represented in the Collection by two examples. 
Nautilus Allioni, Michelotti. 
1840. Nautilus AlUoni, Michelotti, Cefalopodi Fossili, p. 1. 
1842. Nautilus umbilicatus, Sismonda, Synopsis Methodica Animalium 
Invertebratorum Pedemontii Fossiliiim, p. 44. {Not of Lamarck.) 
1847. Nautilus excavatus, Sismonda, ibid. 2nd ed. p. 58. 
^ Proceed. Geol. Soc. 1844, vol. iv. pt. ii. p. 231. 
^ “On the Fossil Echinidse of Malta, by Thomas Wright; with additional 
Notes on the Miocene Beds of the Island and the Stratigraphical Distribution 
of the Species therein, by A. Leith Adams” (Quart. Journ. Geol. Soc. 1864, 
vol. XX. p. 472). 
^ Quart. Journ. Geol. Soc. 1879, vol. xxxv. p. 519. 
