PART III. 



NON-TRILOB1TIC GENERA AND SPECIES. 



MEROSTOMATA. 



EuRYPTERIDvE. 



EURYPTERUS De Kay, 1825; Annals Lyceum Nat. Hist., vol. 1, p. 375. 



Silurian. Carboniferous. 



DOLICHOPTERUS Hall, 1859; Palaeont, New York, vol. 3, p. 414. Silurian. 

 ECHINOGNATHUS Wai., 1882; Am. Jour. Sci., 3d series, vol. 23, p. 213. 



Silurian. 



ADELOPHTHALMUS Jordan and Meyer, 1854; Crust. Steinkohl. Saarb., p. 8. 



Carboniferous. 

 GLYPTOSCORPIUS Peach, 1880; Trans. Eoyal Soc. Edinb., vol. 30, p. 516. 



Carboniferous . 



ARTHROPLEURA Jordan and Meyer, 1854; Crust. Steinkohl. Saarb., p. 13. 



Carboniferous. 

 EURYPTERELLA Matt., 1888; Trans. Eoy. Soc. Canada, vol. 6, p. 60. 



Devonian. 

 PTERYGOTID.E. 



PTERYGOTUS Agas., 1844; Mon. Poissons Foss., note, p. xix. 



Silurian . Devonian . 



SLIMONIA Page, 1856; Advance Text-Book Geology, p. 135. Silurian. 



STYLONURUS Page, 1856; Advance Text-Book Geology. 



Silurian. Devonian. 



SYNZIPHOSURA. 



ACANTHOTELSON M. and W., 1865; Proc. Acad. Nat. Sci. Phila., vol. 17. p. 

 46; Geol. Survey Illinois, vol. 2, 1866, p. 399. Carboniferous. 



XIPHOSUKA. 



CYCLID2E. 



CYCLUS De Kon., 1841; Mem. Acad. Sci. Belgique, vol. 14, p. 13. 



Carboniferous. 

 DIPELTIS Pack., 1885; American Naturalist, vol. 19, p. 293. Carboniferous. 



BUNODID-E. 



BUNODES Eichw., 1854; Beitrage Geol. u. Pal. Russ., p. 131. Silurian. 



cf . Exapinurus Nieszk., 1859; Archiv Nat. Liv-, Esth- u. Kurl., vol. 



1, p. 380. Silurian. 



HEMISAPIS H. W., 1865; Quart. Jour. Geol. Soc. London, vol. 21, p. 490. 



Silurian. 



