Palaeozoic Arachnida of North America. 133 



leg two-jointed. Specimen No. 37970 was originally No. 1702 of 

 the Lacoe collection. It is Scudder's type and is indeed ex- 

 cellently preserved but for the end of the abdomen which is missing 

 in the observe. Total size 15.3 mm. Cephalothorax 4.5 mm. long, 

 5.6 mm. wide at posterior edge which is so little procurved that 

 it appaars almost to be straight. Anteriorly the cephalothorax 

 is broadly rounded. Eyes absent. Six anterior tergites practi- 

 cally straight, with heavily thickened posterior edge, very short. 

 The following tergites much longer, slightly recurved. Since the 

 other specimen has eleven tergites is it fair to assume that the type 

 had also eleven tergites. The number of sternites seven, the first 

 sternite triangular, large. Chelicera and pedipalpi missing. Coxae 

 of the first pair of legs contiguous throughout their length, without 

 internal apical process. Sternum reduced to a narrow ridge. Pleura 

 probably soft, not segmented. Anal operculum round, ventral 

 in position. Body quite smooth. The " moderately coarse punc- 

 tuation " mentioned by Scudder was due to extraneous matter 

 which was cleaned without difficult}-. 



Found in the Penns\'lvanic (Lover Allegheny) of Braidwood, 

 Illinois. 



