NAUTILIDJE. 
179 
Genus nAUTIIiUS '9 Breyn" (restricted). 
{Angulithes, Oceanus, Bisiphytes^ .) 
a, Nautilus pompilius, outline drawing from an internal cast of the shell 
showing the sutures, to compare with those of h, Nautilus {Hercoglossa') 
Danicus ; c, one of the septa of H. Danicus, showing the position of the 
siphuncle. 
Figure a is about one-third of the natural size ; b and c are of the natural size. 
Figures a and b are drawn from specimens in the British Museum Collec- 
tion ; c, from a specimen in the collection of Miss C. Birley, of Manchester, 
kindly lent for illustration. 
Gen. Char. Shell discoid, compressed-globose, involute ; the um- 
^ The following references to Nautilus are of pre-Linnean date : — Nautilus, 
P. Belon, 1553 : Be aquatilibiis, libre ii. p. 392. Cochlea margaritifera vulgo 
dicta, G. Rondelet, 1554 ; Libri de piscibus marinis, 97. Nautilus, U. Aldro- 
vandi, 1606 : Be reliquis animalibus exsanguibus, liber iii. Cap. iii. p. 257. 
Nautilus sive crassus, G. E. Bumph, 1705 : B' Amboinische rariteitkamer, p. 57. 
Nautilites, C. N. Lang, 1708 : Historia lapidum figuratorum Helvetia, p. 101. 
^ Dissert, Phys. de Polythalamiis, 1732, Cap. vi. p. 12. Some writers quote 
Linnaeus (Syst. Nat. 1758 (ed. x.), p. 708) as the author of the genus (which 
has indeed been known since the time of Aristotle), but Breynius was earlier. 
It would be an endless task to give even the most important of the references that 
have been made to this well-known genus since the time of Linnaeus ; they are 
to be found in the writings of Bruguiere, Cuvier, Lamarek, Sowerby, Deshayes, 
Owen, Bronn, &c. ^ Conch, system. 1801, tom. i. p. 55. 
To obtain the cast the shell was longitudinally sectioned, one half filled 
with paraffin and then immersed in dilute hydrochloric acid, until the shell 
was completely dissolved. 
N 2 
