NORTH AMERICAN GRAPTOLITES 
Rastrites Barrande, 1850. 
barrandi Hall, 1856. 
Retiograptus Hall, 1865. 
barrandi Hall, 1860. 
eucharis Hall, 1865. 
genitzianus Hall, 1859. 
tentaculatus Hall, 1858. 
Retiolites Barrande, 1850. 
ensiformis Hall, 1858. 
venosus Hall, 1852. 
Rhizograptus Spencer, 1878. 
bulbosus Spencer, 1878. 
Straurograptus Emmons, 1856. 
dichotomus Emmons, 1856. 
Tetragraptus Salter, 1863. 
“This genus is not regarded with 
much favor. Graptolithus bryon- 
oides is made the typical species.’’ 
Thamnograptus Hall, 185 
anna Hall, 1865. 
bartonensis Spencer, 1878. 
capillaris Hall, 1859. 
multiformis Spencer, 1884. 
typus Hall, 1859. 
IO] 
Not American. 
Thamnograptus barrandi. 
Reteograptus Hall, 1859. 
Reteograptus geinitzianus. 
eucharis Hall, 1865. 
geinitzianus Hall, 1859. 
tentaculatus (Hall), 1858. 
Gladiolites Barrande, 1850. 
Trigonograpsus ensiformis. 
venosus (Hall), 1852. 
Rhizograpsus Spencer, 1878. 
bulbosus Spencer, 1878. 
Staurograpsus Emmons, 1856. 
dichotomus Emmons, 1856. 
Stephanograptus Geinitz, 1866. 
crassicaulis Gurley, sp. nov. 
extlis Lapworth, sp. nov. 
gracilis (Hall), 1847. 
surcularis (Hall), 1868. 
Tetragrapsus Salter, 1863. A good 
genus. Type Z. cructalis Salter 
1863. 
acanthonotus Gurley, sp. nov. 
alatus (Hall), 1858. 
approximatus Nicholson, 1873. 
bigsbyi (Hall), 1863. 
crucifer (Hall), 1858. 
denticulatus (Hall), 1858. 
fruticosus (Hall), 1858. 
headi (Hall), 1858. 
hickst Hopkinson, 1875.? 
quadribrachiatus (Hall), 1858. 
serra (Brongniart), 1828.7° 
Thamnograptus Hall, 1859. 
anna Hall, 1865. 
barrandi (Hall), 1859. 
bartonensis Spencer, 1878. 
capillaris Hall, 1859. 
?multiformis Spencer, 1884. 
typus Hall, 1859. 
Trigonograpsus Nicholson, 
Type T. ensiformis. 
ensiformis (Hall), 1858. 
1869. 8 
