45Q 



NEW YORK STATE MUSEUM 



Pomatograptus and those with plain thecae of the Diplograptus type under 

 Pristiograptus. Freeh has distinguished four groups among the Mono- 

 grapti with distally prolonged apertures and retains all four (including 

 Pomatograptus) in Monograptus, stating that the) 7 are united by transitional 

 forms. M . p r i o d o n [see text fig. 425] is the type of the first group with 

 trunklike prolonged apertures. The form of the apertural prolongations is 

 distinctly shown in some pyritized specimens of M . clintonensis from 

 Rochester [see fig. 427, also the sections 429, 430]. 



Emmons's species "Monograpsus rectus" and "M. elegans" 

 [see text fig. 423, 424] are undeterminable, the types having been lost, but 

 undoubtedly based on fragments of Didymograptus and noted under that 

 genus [see p. 2 5 5, 256]. 



Monograptus clintonensis (Hall) 



Plate 29, figure i 



Graptolithus clintonensis Hall. Geol. N. Y. 4th Dist. 1843. p. 74; 72, 



fig. 12 

 Graptolithus clintonensis Hall. Pal. N. Y. 1851. 2:39; pi. A 17, 



fig. 1 

 Monograptus clintonensis Geinitz. Die Graptolithen. 1852. p. 58 

 Graptolithus clintonensis Hall. Can. Org. Rem. Dec. 2. 1859. p. 25, 



27, 29; pi. B, fig. 1-4 

 Graptolithus clintonensis Hall. N. Y. State Cab. Nat. Hist. 20th An. 



Rep't. 1867. p. 195, 197; pi. 1, fig. 1-4 

 Lagenograptus clintonensis Hall. N. Y. State Cab. Nat. Hist. 20th 



An. Rep't. Rev. ed. 1870. p. 261; pi. i, fig. 1-4 

 Monograptus priodon Linnarsson. Ofv. af Kongl. Vetens. Akad. Forh. Xo. 5. 



1879. p. 12 

 Monograptus clintonensis Lapworth. Geol. Mag. 1880. 7:68 

 Monograptus clintonensis Geinitz. Mitth. kon. min.-geol.-praeh. Mus. 



Dresden. 1890. 9 Heft, p. 19 

 Lomatoceras clintonense Gurlcy. Jour. Geol. 1896. 4 1308 

 Monograptus priodon Bronn mut. clintonensis (Hall) Freeh. Lethaea 



Pal 1897. 1:641 



