Palaeozoic Arachnida of North America. 35 



From the Upper Coal Measures of Scotland. 



4. E. huthijormis (Pocock). 



= Anthracoscorpio buthiformis Pocock, Carb. Arachn., 1911, 

 p. 24, figs. 6—8; pi. I, fig. 2; pi. II, fig. i. 

 From the Coal Measures of England. 



5. (?) E. ornatus (Fritsch). 



= Feistmantelia ornata Fritsch, Pal. Arachn., 1904, p. 75, pi. XI, 



fig- 1-5- 

 From the Middle Permian (Lebach) of Bohemia. 



6. E. typicus n. sp. 



From the Pennsylvanic (Lower Allegheny) of North America. 



7. E. danielsi n. sp. 



From the Pennsylvanic (Lower Allegheny) of North America. 



8. E. granulosus n. sp. 



From the Pennsylvanic (Lower Allegheny) of North America. 

 Genus Trigonoscorpio n. gen. 

 Cephalothorax triangular, cauda rather weak. 

 Genotype and only species T. aniericanus n. sp. 

 From the Pennsylvanic (Lower Allegheny) of North America. 



Palaeopisthacanthus n. gen. 

 Cephalothorax trapezoidal, cauda very small. 

 Genotype P. schucherti n. sp. 



1. P. schucherti n. sp. 



From the Pennsylvanic (Lower Allegheny) of North America. 



2. P. mazonensis n. sp. 



From the Pennsylvanic (Lower Allegheny) of North America. 

 Genus Microlahis Corda 1839. 

 Cephalothorax trapezoidal, cauda not known, hand very weak. 

 Genotype and only species M. sternbergii Corda, Verh. bohm. 

 Ges. vaterl. Mus., 1839, PP- 14—18, pi. I. Fritsch, Pal. Arachn., 

 1904, p. 69, fig. 87, pi. 9, figs. 1-4. 



Family Mazoniidae. 

 Middle eyes close to anterior edge of cephalothorax. Structure of 

 pedipalpi and sternum not known. 



Genus Mazonia Meek and Worthen 1868. 

 With the characters of the family. 



Genotype and only species M. woodianaM.. andW., Geol. Surv. 

 111., Vol. Ill, 1868, p. 563, with figs. 

 From the Pennsylvanic (Lower Allegheny) of North America. 



