WORMS 



indigestible 



""*" f 



of certain 



other description of vegetable debris. 



quantities of earth, absorbing from it ft, constituents, and depc 



residuum therefrom m the form of '< earth-casts." The useful fiction thus 



worms in bringing up earth from considerable depths and redeoosiH, 



the ground has been fully demonstrated in one of Mr. Darwinl work Th "*** 



species of British earth-worms, none of which, however, attain to the 



kinds indigenous to Australia and South Africa. 



3 or 4 feet long when unextended, and will on the 



thickness, which is proportionate, may vary from thaTofT man^s finger to that of "an 



o * 



The most numerically abundant and structurally varied representatives of the bristle 

 beanng worms are mhab.tants of the sea, and are divisible into two easuy reco" id 

 natural groups. In one of 

 these the animals resemble 

 earth-worms in their ability 

 to move about freely from 

 place to place. In the other 

 group they secrete and per- 

 manently reside within a tu- 

 bular edifice, which may be 

 calcareous and of shell-like 

 hardness, or composed of par- 

 ticles of sand, mud, or other 

 substances. The free-roving 



O 



group, which embraces by far 

 the larger number, includes 

 such forms as the LUG-WORM, 

 or LOB-WORM (held in high 

 repute for fishing-baits), and 

 a host of other allied species. 

 In all of these the develop- 

 ment of bristles and other 

 appendages is more pro- 

 nounced than in the Earth- 

 worms. In another group, 

 known as the NEREIDS, the 

 elongate worm-like body is 

 more or less flattened in shape ; 

 unjointed leg-like appendages, 

 supplemented by bristles, are 

 developed from the majority of the segments, and the animal presents a somewhat centipede- 

 like aspect. This likeness is further enhanced by the presence of antennae-like organs at the 

 anterior extremity, while the mouth is armed internally with a pair of sharp-pointed, horny 

 jaws. In many of the nereids the lateral organs are flattened out and paddle-like, constituting 

 effective swimming-structures. Some of the larger species attain a length of several feet, and 

 are especially noteworthy for the brilliantly iridescent tinting of their skins. The palm of beauty 

 with respect to its brilliant colouring must undoubtedly, however, be awarded to the so-called 

 SEA-MOUSE, frequently cast up by storms on the British coast. In this creature the body is 

 comparatively short and thick, 3 or 4 inches long by i|- to 2 inches wide. The centre 

 of the back is covered in by a felt-like mass of fine interlacing hairs of a brownish hue, 

 underneath which are broad, flat scales which protect the breathing-apparatus. The sides are, 

 however, thickly clothed with long, slender hairs and bristles, each of which reflects the 



Phete fy W. Saville-Kent, F.Z.S.] 



TUBE-WORMS 



Some -with their flower-like gill-tufts expanded 



[Milftrd-m-Sia 



