THE HAMILTON ASSOCIATION. I31 



RHYNCHONELLID^. 

 Genera and Species. Authority and Reference. 



R. neglecta Hall, Pal. N. Y., Vol. II. 



obtusiplicata " " " " 



var " " " " 



rugosa " " " " 



Pentamerus oblongus Vannuxen, 1842, Pal. N. Y. 



Stricklandinia Canadensis Billings, 1859, Can. Nat. 



R. pesum Hall and Whitefield, 1875, Ohio Pal., Vol. II. 



Indianensis Hall, Vol. 4, Niag. group 



Whitii Hall (pre-occupied) 



cuneata Dolman, 1827 



acinus Hall, 1863, Niag. group. Vol. 4 



Eichwoldia reticulata Billings, 1858 



Retzia (not R. evax.) 



STROPHOMENIDiE. 



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



" rhomboidalis , Wallenburg, 1821 



Stropodonta semifosciata , Hall, 1863 



Striptorynchus tenuis , " 1859 



LeptEena transversalis Dolman, 1827 



Orthis elegantula " 



" flabellum Hall, 1843 



" porcata McCoy, 1846, Sil. Foss. 



Strophomena Leda Billings, Can. Geol., Vol. V. 



Stroph. subplana Conrad, 1842, Vol. VIII. 



Strophodonta Striata Hall, 1843 



CRANID^. 



Crania Anna Spencer, 1882, Niag. Foss. 



Crania Siluriana , Hall 



2 Crania — undescribed. 



DISCINID^- 



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



" clara Spencer, 1882, Niag. Foss. 



LINGULID^. 



Lingula ingens Spencer, 1882, Niag. Foss. 



