314 
NirriLoiDEi. 
periphery, in crossing which they make a broad arch. There is a 
very distinct internal (dorsal) lobe in young specimens. The 
siphuncle is a little below the centre. The test is unknown. 
Remarks. “ This species is distinguished from Nautilus Fran- 
conicus by the form of its shell, which has a rounded instead of a 
truncated periphery ; its siphuncle also is differently placed. There 
is no species in the Chalk of Europe with which it may be compared. 
N. Danicas has been recognized by H. F. Blanford ‘ in the upper 
part of the Arrialoor Group (Cretaceous) of Southern India. Mr. 
Elanford found that the only difference between the Indian speci- 
mens and the figures of N. Danicus given by Lyell in the Trans. 
Geol. Soc. (loc. cit.) was ‘ a somewhat greater compression of form ’ 
in some of the former; this he found, however, to be a variable 
character in the Indian specimens. He remarks that the very large 
size to which the Trichinopoly specimens occasionally attain can 
scarcely be regarded as a specific character. The internal lobe is 
present in young examples of the Indian specimens, disappearing in 
older ones. In the volume already quoted ~ Stoliezka has the fol- 
lowing remarks on the present species : — ‘ So far as the existing 
figures of N. Danicus [Trans. Geol. Soc., loc. cit.'] allow an opinion to 
be formed, the Indian fossil does not vary from the European, except 
in the usually greater thickness of the whorls.’ The following 
species from the Cretaceous rocks of Southern India form a group of 
which N. Danicus is the European representative, viz. N. serpentinuSy 
Elanford N. Forhesianus, Elanford \ N. TrichinopolitensiSy Elan- 
ford {Foord and G. C. Crick.) 
A cast of the body-chamber of this species, presented by J. E. 
Lee, Esq., F.S.A., F.G.S., measures 4| inches in its greatest dia- 
meter. This is the largest specimen in the Collection. There are 
obscure folds upon its surface, radiating from the umbilicus. 
We learn from Lundgren® that a species of Nautilus referred by 
^ Mem. Geol. Surv. India — Paljeont. Indica — 1861, ser. i. Cret. Ceph. of 
Southern India, p. 24. 
2 Mem. Geol. Surv. India — Palseont. Indica — 1866, ser. iii. Cret. Ceph. of 
Southern India, p. 208. v 
3 Mem. Geol. Surv. India — Palseont. Indica— ser. i. 1861, p. 25, pi xii. 
ff. 1, 1 a. Ibid. ser. iii. 1866, p. 208, pi. xcii. f. 2. 
^ Ibid. p. 26, pi. xiii. Forbesiatim was afterwards changed by Stoliezka 
(ibid. p. 208) to Ootafoorensis, on the ground that d’Archiac had already de- 
scribed dt. Nautilus Forhesi from the Nummulitic rocks of the Punjaub. 
" Ibid. p. 37, pi. xxiii., pi. xxiv. ff. 1, 2. Ibid. ser. iii. 1866, p. 212. 
® Palaeontologiska lakttagelser ofver Faxekalken pa Limbamn (Ur Univer- 
sitets Arsskrift), 1867, p. 14. 
