Inlruductioi to ^iiiuiial Morphology. 377 



clothing, &c. ; the Icg-likc maxillary and mandibular palps 

 have no claws. Sternum broad, with a mesial groove ; legs 

 with two long claws each ; ocelli one pair ; crescentic stalked 

 processes' arise at the origin of the hindmost pair of legs, 

 which may be homologous to the combs of the scorpions. 

 <^ialcodes (Solpuga) inhabits S. Euroix-. and Asia. 



CHAPTER XLV. 



CLASS 3. — MYRIOPODA {Gersiaccker)* 



Arthropods with a distinct head, one pair of an- 

 tennae, trachea?, and a long cylindrical or flattened 

 body of g-i6o, nearly homonomous, limb-bearing 

 somites. Each metamere has a ring of chitinous or 

 calcified (Julus) integument (Chilopoda), or the rings 

 of each pair of segments are confluent, or the rings 

 may be only partially chitinized as dorsal, or dorsal 

 and ventral plates. The subulate or filiform seven- 

 or many-jointed antennae arise under, rarely over, 

 the frontal plate, and have many single or clustered 

 sensory-rods. The mouth is ventral, surrounded by a 

 lip. The hook-like mandible bears a movable palp 

 on the chewing surface. Both pair of maxillrc may 

 unite mesially to form a lower lip (Chilognatha), or 

 the second pair alone may unite (Chilopoda), or may 

 be absent. There is no distinct maxillary palp. The 

 ventral ganglia arc paired, homonomous, 8-16 (Litho- 

 bius), 22 (Scolopendra), 140 (Geophilus), united by 

 commissures ; there are two epipharyngeal ganglia 

 joined by a commissure, and giving off optic and 



* Myriapofl.i of Leach and older writers. 



