No. 3.] SPENCER — PALAEOZOIC GEOLOGY. 167 



STROPHOMENIDAE. 



Strophomena profunda Hall, 1852, Pal. N.Y., Vol. II. 



" rhomboidalis Wallenberg, 1821, Act. Soc. Sci. 



Upsala. 



Strophodonta semifasciata Hall, 1863, Trans, Alb. Inst. 



Streptorhyncus tenuis '' 1858, " " 



Leptena transversalis Dalman, 1827, Kongl. Vet. Acad. 



Hanal. 



Orthis elegantula Dalman, " " " 



" flabellelum Hall, 1843. 



" porcata McCoy, 1846, Sil. Foss. of Ireland. 



CRANIAD.*;. 



Crania anna Spencer, 1882, Niagara Fossils. 



DISCINIDAE. 



Discina tenuilamellata Hall, 1852, Pal. N.Y., Vol. II 



" clara Spencer, 1882, Niagara Fossils. 



LINGULIDEA. 



Lingula oblonga Conrad, 1839, Ann. Rep. N.Y. 



« lamellata Hall, 1852, Pal. N.Y., Vol. II. 



" ingens Spencer, 1880, Niagara Fossils. 



LAMELLIBRANCHIATA. 



Avicula emacerata Conrad, 1842, Jour. Acad. Nat. So. 



Pterinea brisa Hall, 1867, 20th Regent's Rep. N.Y. 



Posodonomya rhomboidea " 1852, Pal. N.Y., Vol. II. 



Modiolopsis subalata " " " " 



u gp a a u it 



GASTEROPODA. 



Platyostoma niagarensis Hall, 1852, Pal. N.Y., Vol. II. 



Lonoxema leda " 1867, 20th Regents Rep., N.Y. 



Pleurotomaria clipeiformis Spencer, 1882, Niagara Fossils. 



PTEROPODA. 



Conularia niagarensis Hall, 1852, Pal. N.Y., Vol. II. 



" magnijica Spencer, 1879, Can. Nat. 



'•' rugosa . " 1882, Niagara Fossils. 



CEPHALOPODA. 



Orthoceras virgatum • • • 'Sowerby, 1839, Murch. Sil. Syst. 



" annulatum " 1818, Min. Concl. 



« simulator Hall, 1876, 28th Reg. Rep. N.Y. 



" crebescens (?) " 1867, 20th " " 



" bartonense Spencer, 1882, Niagara Fossils. 



Cyrtoceras reversum " " " 



Lituites niagarensis " " " 



ANNELIDA. 

 Cornulites fiexuosus , Hall, 1852, Pal. N.Y., Vol. II. 



