Palaeozoic Arachnida of Xortli America. 



103 



is in the Peabody Museum, No. i68, and is from Bucks oral pit at 

 Harris, Illinois. The third and best is in the collection of Mr. L. E. 

 Daniels. All specimens are from the same region, are almost of the 

 same size and agree completely in the details of structure. 



Type specimen, Plate IX, figs. 47, 48. Total length 15.0 mm. 

 Cephalothorax, length 6.0 mm. ; it is somewhat pressed out of shape 

 and the width given by Scudder as 7.0 mm. is excessive. 



Fis, 6c 



Fig. 62. 



Figure 60. — Trigonomarfiis pustiilatus (Scudder), specimen in the collection 



of Mr. L. E. Daniels, dorsal view of body. Figure 61. — Same, reverse, 



3 

 showing the whole specimen as it appears on the nodule. X Y' Figure 62. — 



Hind leg of the specimen from the Pennsj-lvanic, Morris, Illinois, Peabody 



Museum No. 168. X -^ 



Specimen in the Peabody Museum, No. 168. Total length 16.3 mm. 

 Of interest is the right hind leg represented in text figure 62. It is 

 preserved not as a mould, but is actually the petrified limb. Lying 

 on the side, it shows the shape and thickness of the coxa, represented 

 by the inner fine lines on the figure. The trochanter has an unusual 

 shape, its dorsal surface being much longer than the ventral one, 

 o that this joint is articulated with the femur in a manner similar 



