2(JG 
XArxlLOIDEA. 
of the septa, of ^yhich there are more than 24 in the whorl.” 
{Elan ford.) 
Remarks. This species is said to be closely related to Nautilus 
Negama, Blanford ( = N. crebt'icostatus, Blanf., according to Stoliczka), 
N. 2 ^seudoelegans, Blanford \jion d’Orbigny], and N. creOricostatus, 
Blanford. 
Stoliczka^ identified the present species with N. Neocomiensis, 
d’Orb., after a comparison of actual specimens of the European with 
the Indian species, but there are not wanting characters which 
separate the two forms ; thus, the ribs in N. Kayeanus are much 
coarser than those of N. Neocomiensis, and bend backwards almost 
at right angles to the sutures, in a manner very different to 
the ribs in the last-named species, in which their direction is more 
nearly in accordance with that of the sutures. 
Horizon. Utatur ^ Group ( = Chalk Marl and Upper Greensand 
of England, Cenomanian or Tourtia group of France). 
Locality. Trichinopoly district, India. 
Kepresented in the Collection by a specimen (Xo. C. 2606) which 
was presented to the British Museum by Dr. Wm. King, Director of 
the Geological Survey of India. 
Nautilus triangularis. Monfort. 
1802. Nautilite ti’iangidaire, Montfort, in his edition of Sonnini’s Suite 
a Buftbn ” (Hist. Nat. des Mollusques, An. x.), vol. iv. p. 292, 
pi. xlix. fig. 2. 
1808. Nautilus triangularis, Montfort, Conch. Syst. p. 7 {G. angu- 
lithes). 
1820. Nautilifes angulites, Schlotheim, Die Petrefactenkunde, p. 84. 
1832. Nautilus triangularis, Passy, Descr. G^ol. de la Seine- Inferieure, 
p. 334. 
1834. Nautilus triangularis, d’Archiac, Mem. Soc. G^ol. de France, 
vol. ii. pt. ii. p. 191. 
1840. Nautilus triangularis, d’Orbigny, Pal^ontologie Fran 9 aise, Terr. 
Cret. vol. i. p. 79, pi. xii. 
1842. Nautilus triangularis, Matheron, Cat. M^th. et Descrip, des 
Fossiles du Depart, des Bouches-du-Ehoiie et Lieux Cu-convoisins, 
p. 259. 
1850. Nautilus trianyidaris, d’Orbigny, Prodrome de Paleontologie 
Stratigraphique, vol. ii. p. 145. 
^ Mem. Geol. Surv. India — Palseont. Indica — i. Cretaceous Cephalopoda of 
Southern India, 1866, p. 210. 
^ Formerly written Ootatoor. Utatur is a large Tillage twenty miles north- 
north-east of Trichinopoly. 
