CLASS AEACHNIDA. 



GENERA. — Architarbus, Arthrolycosa, Eoscorpius, Mazonia. 



Abchitarbus, Scudder, 1868, Geo. Sur. 111., 

 vol. 3. [Ety. arche, beginning ; tarbos, 

 object of alarm.] 

 rotundatus, Scudder, 1868, Geo. Sur. 111., 

 vol. 3, Coal Meas. [Sig. rounded.] 



Arthrolycosa, Harger, 1874, Am. Jour. Sci., 



3rd series, vol. 7. [Ety. arthron, a 



joint ; lykos, a spider.] 



antiqua, Harger, 1874, Am. Jour. Sci., 3d 



ser., vol. 7, Coal Meas. [Sig. ancient.] 



Eoscorpius, Meek & Worthen, 1868, Am. 



Jour. Sci., vol. 45. [Ety. eos, dawn ; 



scorphts, a scorpion.] 

 carbonarius, Meek & Worthen, 1868, Am. 



Jour. Sci., vol. 45, Coal Meas. [Sig. 



pertaining to coal.] 

 Mazonia, Meek & Worthen, 1868, Geo. Sur. 



111., vol. 3. [Ety. proper name.] 

 woodana, Meek & Worthen, 1868, Geo. 



Sur. 111., vol. 3, Coal Meas. [Ety. 



proper name.] 



CLASS MYEIAPODA. 



GENERA. — Anthracerpes, Archiulus, Euphoberia, Xylobius. 



Axthracerpes, Meek & Worthen, 1865, Proc. 

 Acad. Nat. Sci. Phil. [Ety. anthrax, 

 coal ; erpo, to creep ; in allusion to its 

 Carboniferous age and probable 

 habits.] 

 typns, Meek & Worthen, 1865, Proc. Acad. 

 Nat. Sci., Coal Meas. [Ety. type of 

 the genus.] This is probably a worm. 



Archiulus, Scudder, 1868, Mem. Bost. Soc. 

 Nat, Hist., vol. 2. [Ety. arche, begin- 

 ning ; ioulos, a wood louse.] 



xylobioides, Scudder, 1868, Mem. Bost. 

 Soc. Nat. Hist,, vol. 2, Coal Meas. 

 [Ety. from its resemblance to the 

 genus Xylobius.] 

 Euphoberia, Meek & Worthen, 1868, Am. 

 Jour. Sci., vol. 45. [Ety. eu, very; 

 plujberas, formidable.] 



armigera, Meek & Worthen, 1868, Am. 



Jour. Sci., vol. 45, Coal Meas. [Sig. 



armed.] 

 major, Meek & Worthen, 1868, Am. Jour. 



Sci., vol. 45, Coal Meas. [Sig. large.] 

 Xylobius, Dawson, 1860, Quar. Jour. Geo. 



Soc, vol. 16. [Ety. xylobius, living in 



wood.] 

 dawsoni, Scudder, 1868, Mem. Bost, Soc. 



Nat. Hist,, vol. 1, Coal Meas. [Ety. 



proper name.] 

 fractus, Scudder, 1868, Mem. Bost. Soc. 



Nat. Hist, vol. 2, Coal Meas. [Sig. 



frail.] 

 sigillariae, Dawson, 1860, Quar. Jour. Sci., 



vol. 16, Coal Meas. [Sig. from the 



Sigillaria in which it was found.] 

 similis, Scudder, 1868, Mem. Bost. Soc. 



Nat. Hist., vol. 2, Coal Meas. [Sig. 



similar.] 



