50 



A Icxa ndcr Pctni iike i ntch , 



obverse shows clearly the cephalothorax, abdomen, post-abdomen, 

 both palpi, one leg complete on the right and fragments of the cor- 

 responding leg on the left. The reverse is baldy deformed, yet 

 it is possible to recognize the coxae of the left side, sternum, genital 

 opercula and the basal joints of the comb. 



Total length about 23 mm. Cephalothorax 6.6 mm. long and 

 6.3 mm. wide at posterior edge which is straight, and unlike the 

 preceding species represents the broadest part of the cephalothorax. 

 The anterior edge is somewhat procurved, the anterior angles rounded. 



Fig. 14. 



Figure 13. — Palaeopistha- 

 canthiis mazonensis n. sp., 

 holotype, U. S. N. M. No. 

 37977, dorsal surface. 

 Figure 14. — Same, ven- 

 tral surface showing the 



Fig. 13- 



the posterior ones almost sharp. No eyes are visible. The abdomen 

 is 10.5 mm. long, the tergites gradually increasing in length from 

 the first to the seventh which is as long as the anterior four seg- 

 ments together. It has no distinct posterior edge, but the whole 

 segment has the form of a half oval. The pedipalpi are heavier 

 than in the preceding species Femur 5.0 mm., patella 5.0 mm., 

 tibia with finger 9.0 mm. The length of the movable finger cannot 

 be ascertained. The only completely preserved leg belongs prob- 

 ably to the fourth pair and is 15.0 mm long. Of the post-abdomen 

 which is very short and thin, are preserved the last three segments 

 and the poison gland Like that of the preceding species it was 

 lying over the seventh abdominal tergite when the specimen baceme 

 imbedded in the mud. • The segments are short and broad, the poison 

 gland with a curved stign. 



