INVERTEBRATE ANIMALS. 83 



irregularly near the surface of the whole body. Peri- 

 PATUS is not unlike the fossil Myriapod Euphoberia. 



I. Order Chilopoda. %e'Aoj, a lip ; ttouj, a foot. 

 Centipedes : animals active, nocturnal, predacious. 



II. Order Chilognatha. x^'^°i' ^ ^^PJ yvaSo:, a 

 jaw. Millipedes : animals tardy, vegetable feeders. 

 About 500 species in this class are recognised by 

 Walckenaer. 



H Examples of Scolopendra gigantea, Litlwhius, 

 Geophilus, Julus, Polydesmus, Himantharimn, 

 &c. Small series of British Myriapoda, 

 collected and presented by H. H. H. 

 Euphoberia Brownii a fossil of the Middle 

 Coal Measures, collected at Ravenhead, and 

 presented by H. H. H. 



Upper Couipartnient. 

 Drawings of Peripatiis and Euphoheria, 



Class ARACHNIDA. apuxyfi, a spider. 



The following characters may serve to distinguish 

 the animals of this class. Head and thorax amal- 

 gamated to form a cephalo-thorax ; antennse none, or 

 modified into nippers; legs never more than four pairs; 

 respiration aerial; transformations none, or indistinct. 



The authorities most used have been C. L. Koch 

 and Dr. C. W. Hahn, ''Die Aracliniden,'^ 16 vols. 8vo., 

 and " Histoi?'e Naturelle des Inscctes Apteres," par M. 

 le Baron Walckenaer et M. Paul Gervais, 5 vols. 8vo., 

 Paris, 1847. 



Group 194. — Sub-class ARACHN I DA-TRACHEARIA. 

 Respiration by the skin or by respiratory tubes, trachece. 



