72 



Alexander Petrimkevitch , 



a distinct chela. The trochanters of the first and fourth leg, and 

 probably of all legs are two-jointed, the first joint rectangular, broader 

 than long, the second joint conical. The femora very long and thin. 

 The abdomen oval, the first sternite very large, triangular. The last 

 or seventh sternite the smallest, crescent-shaped. Behind it a short 

 pygidium and at a little distance from the pygidium a fraction of either 

 a whip or of some joint of the last leg which in this case must have been 



Fig- 34- 



Fig. 36. Fig. 35. 



Figure ^^. — Knstarachne teniiipes Scudder, holotype, U. S. X. M. Xo. 37967, 



ventral surface. Figure 35. — Same, cephalothora? 



X 



Figure T,6.—Kusta- 



rachne conica n. sp., holotype, Daniels coll., ventral surface. X -r 



bent. The former alternative seems, however, to be more probable. 

 The pleurae entire. The abdominal tergites apparently similar in 

 number to the sternites, but not well defined. 



Found in the Pennsylvanic (Lower Alleghen}^) of MazonCreek, Illinois. 



Kustarachne conica n. sp. 

 Plate VI, fig. 35 ; text fig. 36. 



The nodule containing the type and only specimen of this species 

 is in the collection of Mr. L. E. Daniels. The obverse is missing. 

 The reverse is very poorly preserved, owing to pronounced decompo- 

 sition of the rock. Nothing but the coxae and abdomen is visible. 

 Total size 10 mm. Arrangement of coxae same as in A', tenuipes. 

 Abdomen composed of seven segments, without pygidium. The 

 first sternite triangular with a procurved posterior edge. 



Found in the Pennsylvanic (LowerAllegheny) of MazonCreek, Illinois. 



