62 



4 Icxamkr Pctru /, ke vitcli, 



arrangement of all coxae is exactly the same as in G. similis, but the 

 sternum is somewhat different as will be readily understood from a 

 comparison of text figures 20 and 22. The femur of the third pair 

 of legs is 2.8 mm. long, that of the fourth :i.7 mm. (Scudder's figures 

 include the trochanters). The whole body is smooth. Only one 

 specimen in existence. 



From the Pennsylvanic (Lower Allegheny) of Mazon Creek, Illincjis. 



Geralinura similis n. sp. 

 Plate IV, figs. 19, 20; text figs. 21, 22. 

 = G. carhonaria Scudder, ad partem, Mem. Boston Soc. Xat. Hist., 

 Vol. IV, 1890, specimen b, pi. 39, figs- 3—4. 



Fig. 21. Fig. 22. 



Figure 21.— Geralinura similis n. sp., holotype b, U. S. N. M. No. 37985 

 (1754c), dorsal surface. Figure 22. — Same, ventral surface, showing the 



2..5 

 arrangement of the coxae. X y 



As I have already pointed out, the type and only specimen of this 

 species, at present in the collection of the U. S. National Museum, 

 is easily distinguished from G. carhonaria by the shape ot the cephalo- 

 thorax and abdomen, as well as by the sternum. Total length to 

 base of whip 14 mm. Cephalothorax 5.25 mm. long, 3.0 mm. wide at 

 posterior edge which is slightly recurved. Eyes absent. First ab- 



