Palaeozoic Arachnida of North America. 57 



with stigmata at the posterior edge of the second and third abdominal 

 sternites. Genital opening between the second and third sternites. 



Fig. 17. 

 Figure ij. — Masti go pr actus giganteus, from Texas. 



Recent forms probably all oviparous. Two median and in recent 

 forms three pairs of lateral eyes, sometimes totally blind. All 

 Pedipalpi are tropical or subtropical forms. They lead a nocturnal 

 life, hiding during the day under rocks, also in dark places of human 

 dwellings. For the palaeontologist dealing often with imperfectly 

 preserved specimens, the position and structure of the coxae are 



