468 THE INVERTEBRATA 



capacious stomach, and lastly the rectum, which is joined by two 

 short tubes which probably represent Malpighian tubules, and by 

 the duct of the gonad. 



The perivisceral cavity contains no connective tissue cells but is 

 crowded with numerous rounded corpuscles and traversed by bands 

 of longitudinal muscle. The nature of the cavity is not known but 

 the existing account of the embryology describes pairs of coelomic 



Fig, 346. A, Ar3^m/)^ow,an exampleof the Pantopoda. After Mobius. jp^. pro- 

 boscis with mouth; chc. chelicera; /)^. pedipalp; ol. ovigerous leg; i, 2, 3, 

 first three ambulatory legs; ops. opisthosoma bearing, 4, last pair of ambu- 

 latory legs. Fusion of first four segments indicated by stippling. B, Macro- 

 biotus, ?, dorsal view. Modified from GreeflF. cl. cloaca; cor. corpuscles in 

 body cavity; gl. dorsal accessory gland; M. mouth; m.t. Malpighian tubule; 

 od. oviduct; oe. oesophagus; o. ovary; ph. suctorial pharynx; sa.gl. salivary 

 glands; st. stomach; sty. stylets. 



pouches arising as outgrowths of the archenteron,- as in the echino- 

 derms. 



The legs resemble the appendages of Peripatus and each is termin- 

 ated by two forked claws. The last pair are terminal and the anus opens 

 between them. The nervous system consists of suprapharyngeal, 

 subpharyngeal and four pairs of trunk ganglia, the latter correspond- 

 ing to the appendages. 



Physiologically they are interesting in their capacity for resisting 



