ARTHROPODA. I97 



claws. There are a pair of excretory organs, called 

 segmental organs, in each segment, a very worm-like 

 feature, in which it differs from the type of the higher 

 insects, which have coiled excretory tubes, called 

 Malpighian tubes, attached to the posterior part of 

 the intestine. It breathes by tracheae. 



The Myeiopoda, or Millipedes, also have a distinct 

 head, with one pair of antennae; and all the many 

 segments between it and the tail are much alike. 

 The young sometimes undergo a kind of metamor- 

 phosis which might almost be rather called augmen- 

 tation, for new segments are added constricted off from 

 the hind one, until the animal is complete. Species 

 belonging to the order Gldlopoda have the body very 

 flat ; they have' nippers near the mouth with poison 

 glands, from which it easily may be understood that 

 they are carnivorous. They are called Centipedes. 

 The large and dangerous centipede of the Bast is 

 called Scolopendra. There is a common English one 

 which is yellow in colour, is. long and very flat, and 

 wriggles itself in peculiar wavy curves, moving stiffly 

 in the plane in which it is flattened. This is Geo- 

 philus. It has no eyes, but moves its antennae very 

 rapidly about to gain impressions. It makes a nest 

 in the ground, and the female sits on her eggs, coil- 

 ing herself round them.. The Geophili are phos- 

 phorescent, and not only so, but they leave a phos- 

 phorescent trail behind them ; hence, Linnaeus gave 

 to one of them the specific name eh'drica. There are 

 several English brown centipedes with shorter bodies. 



