96 R. R. GURLEY 
[Dicranogtaptus Hall—con?'d. | 
furcatus Hall, 1847. 
[ Dicranograptus Hall—con?’d. | 
 furcatus (Hall), 1847. 
? inequalis (Emmons), 1856. 
! nicholsont Hopkinson, 1870. 
arkansasensts Gurley, 1892. 
diapason Gurley, var. nov. 
parvangulus Gurley, 1892. 
ramosus Hall, 1847. 
sextans Hall, 1847. 
Dictyonema Hall, 1852. 
expansum Spencer, 1884. 
fenestratum Hall, 1851. 
gracile Hall, 1852. 
grande Nicholson, 1873. 
irregulare Hall, 1865. 
murrayl Hall, 1865. 
neenah Hall, 1861. 
pergracile Hall & Whitfield, ’72. 
pertenue Foerste, 1887. 
quadrangulare Hall, 1865. 
retiforme Hall, 1843. 
robustum Hall, 1865. 
scalariforme Foerste, 1887. 
splendens Billings, 1874. 
tenellum Spencer, 1878. 
websteri Dawson, 1860. 
Didymograptus M’Coy, 1851. 
caduceus Salter, 1853. 
whitianus Miller, 1883. 
ramosus Hall, 1847. 
rectus Hopkinson, 1872. 
Dicellograpsus sextans. 
Dictyonema Hall, 1852. 
actinotum Gurley, sp. nov. 
blairz Gurley, sp. nov, 
expansum Spencer, 1884. 
fenestratum Hall, 1851. 
flabelliforme (Eichwald), 1840."* 
gracile Hall, 1852. 
grande Nicholson, 1873, 
. homfrayt Hopkinson, 1875.7 
irregulare Hall, 1865. . 
murrayi Hall, 1865. 
neenah Hall, 1861. 
perextle Gurley, sp. nov. 
in) 
Cc 
pergracile Hall & Whitfield, 72. 
“pertenue Foerste, 1887. 
quadrangulare Hall, 1865. 
retiforme (Hall), 1843. 
robustum Hall, 1865. 
scalariforme Foerste, 1887. 
splendens Billings, 1874. 
tenellum Spencer, 1878. 
webster! Dawson, 1860. 
Didymograpsus M’Coy, 1851. 
arcuatus (Hall), 1865. 
bifidus (Hall), 1858. 
bipunctatus Gurley, sp. nov. 
caduceus (Salter), 1853. 
convexus Gurley, sp. nov. 
euodus Lapworth, 1875.7 
extensus (Hall), 1858. 
extenuatus (Hall), 1865. 
