102 



Alexander Petriinkevikli , 



Fig. 59- 

 Figure 59. — Areonwrtus 

 ovatus n. sp., from the 

 Pennsylvanic( Lower Kana- 

 wha), Cottonhill, West Vir- 

 ginia, holotype, U. S. N. M. 



No. 1 196, showing the dor- 

 5 

 sal surface. X t" 



Areomartus ovatus n. sp. 

 Plate X, fig. 58 ; text fig. 59. 



The type and only specimen of this 

 species is in the U. S. National Museum 

 under No. 1196. Only the obverse is 

 in existence and that shows the cephalo- 

 thorax with abdomen and three joints 

 of one leg. 



Total length 9.75 mm. Cephalothorax 

 remarkably small for the size of the ab- 

 domen, 2.5 mm. long, 3.25 mm. wide, 

 beautifully triangular with scarcely curved 

 margins and the surface divided into 

 hexagonal areas which appear as slight 

 depressions. Pleurae entire. Nine tergites 

 can be counted with the anal operculum 

 impressed on the ninth. The fragment 

 of the leg, which probably belonged to 

 the fourth pair, shows that the legs 

 Were short and stout. 



Found in the Penns\lvanic (lower 

 Kanawha), Cotton Hill, Fayette County, 

 West Virginia. 



Trigonomartus n. gen. 



Cephalothorax triangular with a median crest in the posterior 

 half, covered with irregular polygonal depressions. Visible abdom- 

 inal tergites eight. Sternum very large. Posterior coxae by far 

 the heaviest and much closer together than the preceding pair. 

 Eyes absent. Genotype T. pustulatus (Scudder). 



Trigonomartus pustulatus (Scudder) 

 Plate IX, figs. 47—51 ; text figs. 60—62. 



= Anthracomartus pustulatus Scudder, Proc. Amer. Acad. Arts 

 Sci., Vol. XX, 1884, p. 18. Id., Mem. Boston Soc. Nat. Hist., 

 Vol. IV, 1890, p. 452, pi. 40, figs. 5, 8. 



This species is represented by three excellently preserved speci- 

 mens. The holotype. No. 1752 of the Lacoe collection, is in the 

 U. S. National Museum under No. 37984. The second specimen 



