NAUTILID.13. 
327 
Remarks . This species, as remarked by d’Archiac, bears some 
resemblance to Nautilus triangularis^ Montfort, from the Lower 
Chalk of England, and the Craie Chloritee of France, but it is dis- 
tinguished from the latter by its more flexuoiis sutures and open 
umbilicus. 
This species is among the fossils characterized by Blanford as the 
most important as well as the most abundant of the Ranikot 
group. 
D’Archiac notes in his observations on this species that Carter’s 
Nautilus major may very well be referred to the present species, 
and indeed Carter admits that his species is identical with 
d’Archiac’s h 
Of d’Archiac's figures of the present species it is impossible to 
speak in terms of commendation ; they do not in fact bear out the 
description. The sutures do not exhibit the strong inflexion on 
the side-^ of the shell, near the umbilicus, which is so highly 
characteristic a feature of the species, and but for the remarkably 
angular periphery as depicted in fig. 2 a it would have been 
impossible to recognize the fossil from the figures of it. 
The largest specimen in the Collection (No. 36941), a remarkably 
fine one, has a maximum diameter of 11 inches. 
Horizon, llanikot Group ^ (Lower Eocene ?). 
Locality. Sind, India. 
Represented in the Collection by two specimens (j^os. 36941 and 
.36942), which were presented by Colonel Sykes, 
^ Summary of the Geology of India, in Geological Papers on Western India, 
&c., edited by II. J. Carter, 1857, p. 700 (footnote). 
^ This is the name of the lowest Tertiary subdivision of the geological 
formations occurring in Western Sind and is derived from that of a hill- 
fortress of the Sind Amirs, situated in the Laki range of hills. The lower, 
which includes the greater portion of the Ranikot group, consists of soft sand- 
stones, shales, and clays, probably of fluviatile origin. Towards the top, how- 
ever, the beds consist of highly fossiliferous marine limestone, often light or 
dark -brown in colour, interstratified with sandstones, shales, clays, and ferru- 
ginous bands. These are the lowest beds in Sind, containing a distinctly 
Tertiary marine fauna. The Cephalopoda recognized in the Ranikot group 
are the following ; — Nautilus suh-Fleuriausianus, d’Archiac, N. Beluci, d’Arch., 
and N. Forhesi, d’Arch. (W. T. Blanford, Geology of Western Sind, Mem. 
Geol. Surv. India, vol. xvii. 1880.) 
A Table of the distribution of the fossils described by d’Archiac and Haime 
(in their work entitled ‘ Descr. des Anim. Foss, du Groupe Nummulitique de 
I’lnde,’ 1853-4) in the different Tertiary and Infra-Tertiary Groups of Sind 
was prepared by Mr. F. Fedden, of the Geological Survey of India, and 
published in Mr. Blanford’s report above cited (p. 198). 
Mr. Fedden remarks that “ it had hitherto been impossible, as has been 
