XArTILID^. 
303 
Bemarl's. The admirable figures of this species given by Limdgren 
exhibit its characters perfectly clearly. 
Favre has included under the name Nautilus Dekayi, Morton^, 
forms (such as N. Belleroplion^ Lundgr., N. vastus, Kner, N. Icevigatus, 
d'Orbigny, &c.) which, as observed by iVIeek^, are “ not only dis- 
tinct from Dr. Morton’s species, but not identical with the species 
he figures, which has a more dilated aperture than N. Dekayi, 
while it shows little ribs on the inner volutions, somewhat as in 
3'. elegans and 3”. pseudoelegans, never seen on N. Dehayi at any 
stage of growth.” “His [Favre’s] figure,” continues Meek, “ also 
represents the siphuncle proportionally more nearly central than in 
Dr. Morton’s species.” 
In its inflated form and small umbilicus Nautilus depressus, 
Biukhorst { = N. vastus, Kner), bears some resemblance to the 
present species ; but the former is a much thicker shell, and, more- 
over, the siphuncle, instead of being nearly central, as in N. Belle-- 
ropTion, is situated within the upper third of the septa. 
Horizon. Fpper Cretaceous. 
Localities, Nagorzany, near Lemberg, Galicia; ^Yestphalia; Faxoe, 
Denmark (Fpper Chalk). 
Well represented in the Collection. 
Nautilus Reussii^ Fritsch. 
1845. Nautilus incequalis, Reiiss, Die Versteinerimgen der bohmischen 
Kreideformation, p. 21, Taf. vii. ff. 12, a, h. {Not of J. Sowerby.) 
1872. Nautdus Beussii, Fritsch, Cephalopoden der bohmischen Kreide- 
formation, p. 25, Taf. xii. ff. 4 a, 4 b, 5 a, 5 b. 
Sp. Char. Shell inflated, umbilicus closed. Septa rather distant; 
sutures nearly straight. Ornaments consisting of fine transverse 
thread-like lines, crossed by others of a similar character, producing 
a network of striae, very commonly met with in the young shells of 
Nautilus. 
Remarks. This is a badly characterized species, and it may be 
only a young example of one already described. 
Fritsch makes the following observations upon it : — “ The example 
cited by Beuss from the Baculiten-Schichten agrees in respect to its 
lobes and other characters with a small example of 15 miUim. 
diameter, derived from the Fpper Chalk of Chlomek, near Jung- 
bunzlau. This specimen has part of the test preserved, showing 
^ Synop. Org. Remains, 1834, p. 33, pi. viii. f. 4. 
^ United States G-eol. Surv. Terr. 1876, vol. ix. p. 497. 
