538 THE INVERTEBRATA 



trusible process, which is an ovipositor in the female, a penis in the 

 male. 



The Notostigmata mentioned above (p. 536) are forms transitional 

 between the acarines and the phalangids. 



Class PANTOPODA (PYCNOGONIDA) 



Arachnida, in which the opisthosoma has disappeared, with the 

 exception of the pregenital segment which bears legs on which the 

 genital pore opens. 



Fig. 369. A phalangid, Oligolophus spinosus, adult <S, xz. i, chelicerae; 

 2, pedipalps; 3, 4, 5, 6, walking legs. From Shipley and MacBride. 



These extraordinary animals, e.g. Nymphon (Fig. 370 A), are all 

 marine and semisedentary, crawling slowly over seaweed and seden- 

 tary animals. They consist of the following regions: (i) tht proboscis, 

 a prolongation of the prosoma with the mouth at the tip; (2) four 

 segments fused together bearing four eyes, the chelicerae, the pedi- 



