Palaeozoic Arachnida of North America. 



77 



genus Polyochera, is characterized by the visible segmentation of 

 the abdomen. The family Holotergidae, new, contains the single 



Fig. 



Fig. 



43- 



Figure ^z. — Crypfocellus simonis H. and S., from Brazil; underside, showing 

 the cucuUus (b), the coxae and trochanters, one pedipalp (the other is 

 removed), and the 3d (V3) and 4th abdominal sternites. Figure 43.— 

 Cryptostemma afzelUThoveW, from Africa (Sierra Leone) ; on the left an isolated 

 mandible; on the right the coxae of the 4 th pair of legs (c*). genital opening 

 (o), 1st abdominal sternite (v^), 2d sternite (v^), and 3d sternite (v^). 

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



extinct genus Curculioides and is characterized by the externally 

 unsegmented abdomen which was evidently protected by a heavy, 

 chitinous shield. 



