300 
NAUTILOIDEA. 
Locality. Arialur, Trichinopoly district, India. 
Eepresented in the Collection by several specimens, which were 
presented by Dr. W. King, Director of the Geological Survey of 
India. 
Nautilus, sp. 
Among the specimens of Nautilus presented to the Museum by 
Dr. Wm. King, Director of the Geological Survey of India, is a 
badly preserved cast (Xo. C. 2603), with, however, remains of 
ribbing upon it. The shell is umbilicated, and the ribs begin 
abruptly at the edge of the umbilicus, where they make a sharp 
bend forward, just at their commencement, widening rapidly upon 
the sides of the shell, upon which, however, very little of them is 
preserved. In general form this fossil resembles Nautilus pseudo- 
elegans, Blanford {non d’Orbigny) ; but the absence of all trace of 
the septa, and the curious feature connected with the ribbing — viz., 
its abrupt commencement at the edge of tlie umbilicus, the interior 
of the latter being quite smooth — combine to make any definite 
conclusion as to the relations of this shell extremely hazardous. 
This specimen when received was erroneously labelled Nautilus 
Clementinus, d’Orbigny, which is a smooth species. 
Horizon. Arialur Group? ( = Upper Chalk). 
Locality. Trichinopoly district, India. 
Nautilus Ahltenensis ?, Schliiter. 
1876. Nautilus Ahltenensis, Schliiter, Cephalo])oden der obereu deut- 
schen Kreide, Palm out ographica, Band xxiv, Abtli. ii. p. 176 (56), 
Taf. xlix. ff. 1, 2. 
Sp. Char. Shell compressed, flattened on the sides and periphery, 
giving a subquadrate form to the aperture. Umbilicus open, but 
not large. Septa rather numerous, the sutures very slightly curved 
on the sides of the shell, nearly straight in crossing the peripher 5 \ 
Siphuncle situated nearly in the centre of the septa. Surface of 
the cast smooth. Test unknown. 
BemarJes. This species is said by Schliiter to be nearly related to 
Nautilus Largilliertianiis, d’Orbigny \ but in the latter the siphuncle 
lies very near the inner margin of the septa. 
The crushed condition of the specimen representing the present 
^Paljeont. Frau 9 . (Terr. Oret.), yol. i. p. 86, pi. xviii. 
