CEPHALOPODA. 
49 
The shells of Spirula (Fig. 44) have been long known, and are 
scattered in thousands on the shores of New Zealand and other 
islands in the Pacific Ocean, and they are also found in the Indian 
and Atlantic Oceans, occasionally drifting on the coast of Devon and 
Cornwall. Notwithstanding the abundance of the shells, very few 
specimens of the perfect animal have been captured. The loosely- 
coiled shell resembles a ram's horn, and is divided into a number of 
Fig. 44. 
The Spirilla (Spirula peronii). (From the Indian and Pacific Oceans.) 
1. Animal : a, portions of the shell exposed in front and behind ; b, the funnel 
or siphuncle. 2. Side view of shell. 3. Shell in section, to show partitions 
or septa. 
segments by fine concave partitions, like the shell of Nautilus, each 
one pierced by a slender tube or siphon. It is placed at the hinder 
end of the body, and is covered with so thin a skin, that a small 
portion of it appears to be exposed both in front and behind. 
Absolutely nothing is known of the habits of this very interesting 
creature, although probably they are somewhat similar to those of 
other Cephalopods. 
The Nautilus (Fig. 45), of which several shells (Case 208) and a 
perfect animal in spirit (black upright case A) are exhibited, is an 
inhabitant of the Indo-Pacific Ocean, and differs from all other 
living Cephalopods in being provided with four instead of two gills, 
and, instead of eight or ten arms with suckers and hooks, has a 
E 
