Invertebrate Gallery of the Indian Museum. 87 



The external form of Peripatus is much like that of a 

 caterpillar : the body consists of numerous segments, and 

 bears a pair of antennae and numerous pairs of stumpy 

 jointed legs (fifteen pairs in this species), each of which 

 ends in a pair of small claws. One of the most interesting 

 characters of Peripatus is that the openings of the breath- 

 ing-tubes, or tracheae, are scattered over the body-surface, 

 instead of having a definite arrangement, such as they have 

 in all other air-breathing Arthropods. 



6. ARTHROPODA MYRIAPODA. (Centipedes and Millipedes). 

 [«c0tmi m^ii-c^m 63]. 



In the Myriapoda the body has a considerable re- 

 semblance to that of the appendiculate Annelids, consist- 

 ing of a succession of similar segments, each of which has a 

 pair of short appendages. 



On the head are a pair of antennae, a pair of patches of 

 eyes, and either two or three pairs of jaws. 



Breathing is performed by tracheae, or tubes which 

 ramify throughout the body and open at definite points 

 along each side: the openings of the tracheae, which are 

 known as " stigmata^', are indicated by pointers in the 

 preparations in Case 63. 



The Myriapoda are divided into two Orders, the Chtlo- 

 poda or Centipedes, and the Chilognatha or Millipedes. 



i.-MYRIAPODA CHILOPODA. (Centipedes). 

 [iat0tcrtt ®;aU-ra0e 63]. 

 In the Centipedes the segments of the body are flatten- 

 ed, and their integument is hardened above and below to 

 form a dorsal plate or " tergum", and a ventral plate or 

 "sternum", but is soft at the sides, where, in alternate 

 segments, as is shown in the preparation of Scolopendra in 

 Case 63, the "stigmata", or openings of the tracheas, are 

 found. Each segment carries a pair of jointed legs which 

 end each in a sharp claw. The antennas are long, and the 



