100 
Loganograptus Hall, 1868. Type L. 
headi.™ 
alatus Hall, 1858. 
crucifer Hall, 18—. 
headi Hall, 18—. 
logani Hall, 18—. 
octobrachiatus Hall, 18—. 
Megalograptus Miller, 1874. 
welchi Miller, 1874. 
Monograptus Emmons, 1856. 
convolutus coppingeri Ether- 
idge, 1878. 
elegans Emmons, 1856. 
rectus Emmons, 1856. 
Nemagraptus Emmons, 1856. 
capillaris Emmons, 1856. 
elegans Emmons, 1856. 
Phyllograptus Hall, 1858. 
angustifolius Hall, 1858. 
anna Hall, 1865. 
dubius Spencer, 1884. 
ilicifolius Hall, 1858. 
loringi White, 1874. 
typus Hall, 1858. 
Protograptus Matthew, 1885. 
alatus Matthew, 1885. 
Ptilograptus Hall, 1865. 
foliaceus Spencer, 1878. 
geinitzianus Hall, 1865. 
plumosus Hall, 1865. 
TR ks GAGIRILIE SC 
Dichograpsus Salter, 1863. 
Tetragrapsus alatus. 
Tetragrapsus crucifer. 
Tetragrapsus headi. 
Dichograpsus logani. 
Dichograpsus octobrachiatus. 
Lomatoceras Bronn, 1834. 
clintonense (Hall), 1843. 
convolutum coppingeri (Ether- 
idge), 1878. 
Megalograptus Miller, 1874. 
welchi Miller, 1874. 
(= Monograpsus Geinitz,—a synonym 
for Lomatoceras.) 
Lomatoceras convolutum cop- 
pingeri. 
Didymograpsus ? elegans. 
Didymograpsus ? elegans. 
Nemagrapsus Emmons, 1856. 
capilaris Emmons, 1856. 
Stephanograptus gracilis. 
Phycograptus Gurley, gen. nov. 
brachymera Gurley, sp. nov. 
levis (Hall), 1847. 
Phyllograptus Hall, 1858. 
angustifolius Hall, 1858. 
anna Hall, 1865. 
? cambrensis Walcott, sp. nov. 
Diplograpsis dubius. 
ilicifolius Hall, 1858. 
loringi White, 1874. 
typus Hall, 1858. 
Protograptus Matthew, 1885. 
alatus Matthew, 1885. 
Protovirgularia M’Coy, 1851.75 
P. dichotoma. 
dichotoma ? M’Coy, 1851. 
Ptilograptus Hall, 1865. 
foliaceus Spencer, 1878. 
geinitzianus Hall, 1865. 
plumosus Hall, 1865. 
Type 
