Palaeozoic Arachnida of North America. 



Wi 



pediform, slender, 9.0 mm. long, with subequal joints. Of the first 

 pair of legs only the trochanter, femur and fraction of the patella 

 preserved. In the second and third pair of legs is missing the meta- 

 tarsus and tarsus. Left fourth leg complete, 19.2 mm. long. Patella 



Fig. 63, 

 Figure G^. — Trigo- 

 notarbus schucherti n. 

 sp., holotype, Pea- 

 body Mus. No. 169, 

 dorsal surface of 



cephalothorax and 

 3 

 abdomen. X ^ 



Figure 64.- 



Fig. 

 Same, reverse as 



it appears on nodule. 



present in all legs. Femur I, 2.3 mm. ; II, 3.0 mm. ; III, 4.0 mm. ; 

 IV, 5.1 mm. Tarsus of fourth leg shorter than metatarsus. 



Found in the Pennsylvanic (Lower Allegheny) of Mazon Creek, 

 Illinois. 



Trigonotarbiis carbonarius n. sp. 

 Plate X, fig. 55 ; text fig. 65. 

 The type and only specimen of this species is in the U. S. National 

 Museum under No. 37978. The obverse is missing. 



Total size 15.5 mm. Abdomen lo.o mm. long, 8.0 mm. wade in 

 middle. The small coxae of the pedipalpi touch each other only at 



