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Images Dated 13th September 1993

Choose from 14 pictures in our Images Dated 13th September 1993 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.

Coloured X-ray of the Nautilus shell Featured 13 Sep 1993 Print

Coloured X-ray of the Nautilus shell

Nautilus shell. Coloured X-ray of the cephalopod shell, Nautilus pompilius. This is the common chambered or pearly Nautilus. The shell is empty of contents, with inner chambers and spiral whorls visible. The external colour of the shell is off- white, with radial bands of a tan colour. The siphuncle tube is clearly seen here, passing from one shell chamber to another; this internal tube fills the chambers with gas and enables the Nautilus to float or sink. There are only 6 living species of Nautilus, descended from a large group which originated in the early Palaeozoic era. The animal resembles a squid in having a foot of many tentacles. It feeds on crabs and carrion