MM. Foord and Crick — On Nautilus elegans, Sby. 547 



in the ventral region." The siphuncle was subsequently to this 

 description ascertained to be " rather approaching to the inuer 

 margin of the septa." 1 



The principal feature in which the Indian differs from the European 

 form lies in the more narrowly rounded periphery, and altogether 

 less robust habit of the shell, next in the smaller umbilicus, and, 

 lastly, in the character of the ribbing, which seems to have been 

 coarser in the Indian than it is in the French form. Blanford's 

 fig. 2 (Joe. cit. pi. xix.) certainly gives one the impression of being 

 that of a much narrower shell than d'Orbigny's type. As all the 

 specimens in the Indian Survey Collection are stated to be casts ; it 

 is not surprising that their characters (especially the ornaments of 

 the test) should not have been very satisfactorily made out. 



The four species comprised in the group of Nautilus elegans, J. 

 Sovverby, will now be described, beginning with the typical form. 

 We have confined ourselves to those few references in which the 

 species can be verified by means of adequate descriptions and 

 figures. 



Nautilus elegans, J. Sowerby. 



1816. Nautilus elegans, J. Sowerby, Mia. Conch, vol. ii. p. 33, pi. cxvi. 



1822. Nautilus elegans, Mantell, The Fossils of the South Downs; or, Illustrations 

 of the Geology of Sussex, p. 112, pi. xx. fig. 1 (not pi. xxi. figs. 1, 4, 8). 



1849. Nautilus elegans, Quenstedt, Die Cephalopoden, p. 57, Tab. ii. tig. 7 

 (reduced from Sowerby's figure in tbe Min. Conch, pi. cxvi.). 



1853. Nautilus pseudoelegans, Sharpe, Description of the Fossil Remains of Mollusca 

 found in the Chalk of England (Mon. Pal. Soc), pt. 1, Cephalopoda, p. 13, 

 pi. iv. figs, la, lb (not pi. iii. fig. 3, nor pi. iv. fig. 1). 



? 1872. Nautilus elegans, Geinitz, Paheontographica, Band xx. pt. ii. " Das 

 Elbthalgebirge in Sachsen," pt. ii. p. 181, Taf. xxxii. fig. 6. 



[Not 1840. Nautilus elegans, d'Orbigny, Paleoutologie Franc, aise, Terrains Cret. 

 tome i. p. 87, pi. xix. — 1850. Nautilus elegans, d'Orbigny, Prodr. de Paleont. 

 Stratigr tome ii. p. 145. — 1853. Nautilus elegans, Sharpe, Description of the 

 Fossil Remains of Mollusca found in the Chalk of England, pt. i. Ceph., 

 Mon. Pal. Soc. p. 12, pi. iii. fig. 3 ; pi. iv. fig. 1. — 1861. Nautilus elegans, 

 Blanford, Mem. Geol. Surv. India— Palseontologia Indica— I. Cretaceous 

 Cephalopoda of Southern India, p. 29, pi. viii. fig. 4; pi. xvi. figs. 1-4. — 

 1866, Nautilus elegans, Stoliczka, Mem. Geol. Surv. India — Palseont. Indica, 

 I. CretaceousCephalopodaof Soutbern India, p. 209. — 1876. Nautilus elegans, 

 Meek, Rep. United States Geol. Surv. Terr. vol. ix. p. 499, pi. viii. 

 figs. 2a-c] 



Specific Characters. — " Gibbose, umbilicate, with numerous linear, 

 reflexetl, radiating sulci. About two-thirds as thick as wide ; the 

 septa are rather numerous, gently waved ; the aperture is obtusely 

 sagittate, with the posterior angles truncated ; umbilicus small, 

 perhaps closed." (J. Sowerby.) 



A more exact description of the species may be given as follows : 

 " Shell inflated, somewhat flattened upon the sides, rather narrowly 

 rounded upon the periphery ; whorls deeply embracing. Umbilicus 

 small. Septa moderately distant from each other, being 1^ inches 

 apart upon the periphery in the type-specimen, where the height of 

 the whorl, measured from the umbilicus, is about 4^ inches. The 



1 Stoliczka, Mem. Geol. Surv. of India — Pala;ont. Indica — I. Cretaceous Cephala- 

 poda of Southern India, p. 210, pi. xciii. f. 3. 



