North American Palaeozoic Crustacea. 7 



Stimpsoni, White, 1884 ; 13th Rept. Dept. Geol. Nat. Hist. Indiana, p. 176, 



pi. 37, figs. 4, 5. 

 Stimpsoni, Packard, 1886 ; Mem. Natl. Acad. Sci., vol. 3, p. 124. 

 Packard considers this species to be a young specimen of A. Eveni. 

 Amphipeltis, Salter, 1863 ; Quart. Jour. Geol. Soc. London, vol. 19, p. 75. 

 Diagnosis. — "Carapace oblong-oval, rounded in front, and more truncate 

 behind, with a thorax of (probably) 9 segments. 5 of wliich project 

 beyond the carapace, and 4 are concealed beneath it. Tail-piece semi- 

 circular, as wide as the abdomen, and as long as the last three segments 

 taken together." 

 paradoxus, Salter, 1863 ; Quart. Jour. Geol. Soc. London, vol. 19, p. 76, 



fig. 11, a, b. 

 paradoxus, Dawson, 1878 ; Acadian Geology, p. 523, fig. 180. Devonian, 

 paradoxus, Salter and Woodward ; Chart of Fossil Crustacea, pi. 3, fig. 3. 

 Authr aconites, Meek & Worthen, 1868 ; Am. Jour. Sci., 2d series, vol. 46, p. 21. 

 See Eurypterus. 

 Afazonensis, Meek & Worthen ; see Eurypterus Mazonetisis. 

 Anthrapalaemon, Salter, 1861 ; Quart. Jour. Geol. Soc. London, vol. 17, 

 p. o29. Type A. Grossarti, Salter, 

 gracilis. Meek & Worthen, 1865 ; Proc. Acad. Nat. Sci. Phila., vol. 17, 

 p. 50. Coal Measures, 



gracilis. Meek & Worthen, 1866 ; Geol. Survey Illinois, vol. 2, p. 407, 



pi. 32, figs. 4, a, b, c. 

 gracilis. Meek & Worthen, 1868; Geol. Survey Illinois, vol. 3, p. 554, 



figs, a, b. 

 gracilis, White, 1884; 13th Rept. Dept. Geol. Nat. Hist. Indiana, p. 180, 



pi. 38, figs. 8, 9. 

 gracilis, Packard, 1881 ; Am. Naturalist, vol. 19, p. 880. 

 gracilis, Packard, 1886; Mem. Natl. Acad. Sci., vol. 3, p. 135, pi. 4, 



figs. 1, 2, 3, 5, 6 ; pi. 7, figs. 3, 4, 5, 6. 

 (Palseocarabus) Hillianum, Dawson, 1878 ; Supplement Acadian Geology, 

 p. 55, fig. 10: also Geol. Mag., vol. 4, 1877, p. 56, fig. 1. Coal Measures. 

 Aptychopsis, Barrande, 1872; Syst. Sil. Boheme, Suppl., vol. 1, p. 436. 

 Archaeocaris, Meek, 1871 ; Proc. Acad. Nat. Sci. Phila., vol. 23, p. 335. 

 vermiformis, " " " '" " p. 355. 



Carboniferous. 

 Aristozoe, Barrande, 1872 ; Syst. Sil. Bohfime, Suppl. vol. 1, p. 474. 



rotundata, Walcott, 1887; Am. Jour. Sci., 3d series, vol. 34, p. 193, pi. 1, 

 fig. 9. Cambrian. 



Troyensis (Ford), Walcott, 1887 ; Am. Jour. Sci., 3d series, vol. 34, p. 193, 

 pi., fig. 8. 

 Leperditia Troyensis, Ford, 1873 ; Am. Jour. Sci., 3d series, vol. 6, p. 138. 



Cambrian. 



Aristozoe sp. ? Shaler & Foerste, 1888 ; Bull. Mus. Comp. Zoology, vol. 16, 



p. 35, pi. 2, fig. 18. Cambrian. 



