76 



Alexander Petritnkevitch, 



in the normal position of the abdomen. Chelicera two-jointed, 

 chelate. Pedipalpi chelate, composed of coxa, a two-jointed tro- 

 chanter, femur, tibia and tarsus, the latter forming \\dth a process 

 of the tibia a small chela. All coxae contiguous, those of the an- 

 terior three pairs immovable, while the fourth pair is movable. Pa- 

 tella present in all legs. Trochanter of the first and second pair 



Fig. 41. 



Figure /^i. — Cryptostemma karschii H. and S., a recent representative of 

 the order Ricinulei from Kamerun and Congo ; dorsal surface showing the 

 cucullus, cephalothorax, the 3d— 6th abdominal tergites, the "tail", and the 

 lour pairs of legs. Between the trochanters of the 2d and 3d pair of legs one 



may see a part of the pedipalpi, which are bent downward. 

 (From H. J. Hansen and W. Sorensen, On two Orders of Arachnida, 1904.) 



of legs single, of the third and fourth pair two-jointed. First tarsus 

 one-jointed, second five-jointed, third four-jointed, fourth five- 

 jointed. In the male the third metatarsus and tarsus are modified, 

 representing probably an organ of copulation. Eyes absent. Geni- 

 tal opening between the first and second sternite. Organs of res- 

 piration in form of two tracheal tubes with a pair of spiracles on the 

 cephalothorax. Oviparous. Only few recent species known, all 

 from Africa and South America. 



This order may be divided into two families. The family Cryp- 

 tostemidae Westwood, comprising all recent forms and the extinct 



