Palaeozoic Arachnida of North America. 99 



2. T. schucherti n. sp. 



From the Pennsylvanic (Lower Allegheny) of Mazon Creek, 

 Illinois. 



3. T. carbonarius n. sp. 



From the Pennsylvanic (Lower Allegheny) of Mazon Creek, 

 Illinois. 



Genus Aphantomartus Pocock 1911. 

 Genotype and only species 

 I. A. areolatus Pocock, Carb. Arachn., 1911, p. 81, pi. Ill, fig. 6, 

 text fig. 41. 



From the Coal Measures of South Wales. 



Areomartus new genus 

 Genotype and only species 

 I. A. ovatus n. sp. 



From the Carboniferous of Fayette Co., West Virginia. 



Trigonomartus n. gen. 

 Genotype and only species 

 I. T. pustulatus (Scudder) 



= Anthracomarius 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. 



From the Pennsylvanic (Lower Allegheny) of Mazon Creek, 



Illinois. 



It is probable that the arachnid from Bohemia, described by 



Fritsch under the name of Promygale rotundata (Pal. Arachn., 1904, 



p. 20, text figs. 23—25) also belongs to the family Eophrynidae 



of this order. 



DESCRIPTION OF NORTH AMERICAN CARBONIFEROUS 

 ANTHRACOMARTI 



Family Anthracomartidae. 

 Genus Anthracomartus Karsch (Pocock 191 1). 

 Pleural laminae divided, not emarginate. Abdomen rounded. 

 Pedipalpi pediform. Genotype A. voelkelianus Karsch. 



Key to North American Species of Anthracomartus. 

 I. Cephalothorax almost rectangular, wider than long 



A. trilohitus 

 + Cephalothorax triangular A. triangularis 



