PEDIPALPI. 



809 



and seven behind. The respiration is carried on by the two 

 pair of lung-sacs mentioned above. The nervous system is 

 very concentrated and a median nerve which traverses the meso- 

 and meta-soma is said to expand posteriorly into a ganglion. 



There is a well developed but a symmetrically placed pair of 

 " stink-glands " with reservoirs, whose ducts open with or near 

 the anus. The last segment of the body, which with one or two 

 others is narrowed and cylindrical, bears some light spots variously 

 interpreted as eyes or olfactory organs, but at present the 

 allocation of functions to these organs is purely conjectural. 



The reproductive organs are paired, and the male has w r ell- 

 developed vesiculae seminales. The group is as far as is known 

 oviparous, and the eggs are embedded in a gelatinous mass 

 which is carried about on the ventral surface of the abdomen 

 of the mother which 

 becomes arched or 

 concave to receive 

 the ova. The 

 young emerge from 

 the egg as minia- 

 turesof their 

 parents. 



The Pedipalpi are 

 predaceous, living 

 chiefly on insects. 

 They inhabit the 

 warm parts of the 

 globe in both hemi- 

 spheres. Phrynusis 

 found in the Ter- 

 tiary strata and a 

 genus known as 

 Geralinura in the 

 Carb oniferous. 

 They are classified 

 in two tribes, three 

 families and twenty- 

 two genera with 

 some sixty to 

 seventy species. 



" n ' ?l " 



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FIG 524 Thdyvhonug giganteug (Koch), a Pedipalpi ; 

 6 "movable fang or claw forming with c claw on 4th joint, 

 a didactyle claw; d claw on 3rd joint; / segment*! 

 elongation of abdomen supporting tail ; q tail ; h cheli- 

 cerae m eves o first palpal joint, with characteristic 



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