252 : THE OCEAN WORLD. 
glance, they seem to proceed now from one side, now from the 
other. 
The family Cal/ianiride forms a sort of connecting link between 
the Pleurobrachiade and the Cestide. Their bodies are smooth and 
regular, vertically-elongated, compressed on one side and as if 
lobated on the other ; in substance they are gelatinous, hyaline, and 
tubular, obtuse at both extremities, with buccal openings between 
the prolongations of the sides, and two pairs of conical appendages 
resembling wings, capable of expansion, on the edges of which two 
rows of vibratory cilia are ranged. A great transversal dpening 
presents itself at one of the extremities, a small one at the other. 
The animal is furnished with two branching tentacles, but without 
cilia. 
In the family Cestide we have the genus Cestum. C. veneris, or 
Venus’s Girdle, as it is vulgarly called, has a long, gelatinous, ribbon- 
like body, fine, regular, and very short, but much extended on each 
side, while the edges are furnished with a double row of cilia; the 
lower surface is also furnished with cilia, but much’ smaller in size 
and number. On the middle of the lower edge is the mouth, 
opening into a large stomach. This alimentary canal runs across the 
middle of its length, and from it extends, as in the Meduse, a series 
of gastric canals, which carry the nutriment into all parts of the body. 
There are many species of Cestum; among them the best known is 
C. veneris (Fig. 103), which is found in the Mediterranean, parti- 
cularly in the sea which bathes the coast of Naples and Nice, where 
the fishermen call it the sabre de mer—sea-sabre. This curious 
creature unwinds itself on the bosom of the waters, like a scarf of 
iridescent shades. It is the scarf of Venus traversing the waves, 
under the fiery rays of the sun, which has coloured it with a thousand 
reflections of silver and azure blue. 
In the last family, Cadlymmide, the body is furnished with a pair 
of antero-posterior oral lobes and other smaller lateral appendages. 
The tentacles are various, and turned towards the mouth, 
