THE HAMILTON ASSOCIATION. 1 29 



Genera and Species. Authority and Reference. 



Dictyonema retiforme Hall, 1852, Pal. N. Y, 



" gracilis " " 



" Websteri Dawson, 1868, Acad. Geol. 



" tenellum Spencer, 1878, Can. Nat. 



Calyptograptus cyatheformis " " 



" subretiformis " " 



" micronematodes Spencer, 1882, Can. Nat. 



" radiatus 



Rhizograptus bulbosus Spencer, 1878, Can. Nat. 



Acanthograptus Granti " " 



" pulcher , 1882 



Inocaulis plumulosa Hall, 1852, Pal. N. Y. 



bella Hall and Whitfield, 1874, Pal. Ohio 



" Walkeri Spencer, 1882, Niag. Foss. 



" problematica " " " 



diffusa 



ramulosa 



" Corsicornis " " " 



phyordes " " " 



Thamnograptus Bartonensis 



" multiformis 



Ptilograptus foliaceous Spencer, 1878, Can. Nat. 



Cyclograptus rotadentatus " " " 



About 400 specimens in Washington, sent to Dr. Gurley for 

 description, including several new species. 



ACTINOZOA. 



Favosites Niagarensis Hall, 1852, Pal. N. Y , Vol. II. 



" favosa Goldfuss, 1826, Germ. Pet. 



Astrocerium constrictum Hall, 1852, Pal. N. Y., Vol. II. 



Syringolites nuronensis Hinde, 1879, Geol. Mag. 



Cladopora multipora Hall, 1 852, Pal. N. Y., Vol. II. 



Striatopora flexuosa '*' " " 



Halysites Catenularia Linn, 1767, Sys. Nat. 



Syringopora verticillata Goldfuss, 1826, Germ. Pet. 



" rugosa " " 



Cyathophyllum radiculum - Rominger, 1876 



