207 



DiPL. 



MX, PLXL 



Diplograptus pristis. {Oraptolithus pristis.) Eogers, 



page 820, fig. 612. Illb. Lorraine 

 (Hudson Eiver) formation. (His- 

 ;\ inger's Prionotus pristis, Leth. 

 Suec. 8. A. Miller). (Note. This as 

 Biplograpsus^ is not a Hudson Eiver 

 fossil, but occurs in the Z. C'. Lower 

 Cambrian (Georgian) formation of 

 eastern New York and Vermont; but its presence in the 

 slates of No. Ill in Pennsylvania argues that either it con- 

 tinued to live into Hudson river (Lorraine) times, or that Wal- 

 cott's view of its habitat is erroneous. It must be observed, 

 however, that this, or some other graptolitei^ found in a graph- 

 itic (?) calcareous slate in Sinking Valley, Blair Co., la., 5,000 

 feet beneath the bottom of the Utica slate. (T, p. 245). — II a. 

 Diplograptus? simplex. {Fucoides simplex, Emmons; 



Fueoides secalinus,. 

 Eaton ; Graptolithus 

 secalinus, Hall; Diplo- 

 grapsus simplex, Em- 

 mons, Amer. Geol. 

 Vol. 1,'part 2, page 104, 

 plate 1, fig. 11, added 

 here for comparison.) 

 Walcott, Bulletin D. S. 

 G. 8. No. 30, page 92, 

 plate 11, fig. 4, 4«, 

 natural size. — Z. C. 

 LoicGT Camirian 

 {Georgian) formation, Parker's quarry, Vt. — (See also Em 

 mons' Taconic system, 1844, plate 5, fig. 1.) 



Diplograptus (Graptolithus) spinulosus. Hall, Pal. N. 

 Y. Vol. 3, p. 517. Wood cut of a fragment of this 

 species of graptolite e7ilarged to twice its natural 

 size, found with the preceding species near Albany 

 in the slates of the Hudson Eiver formation. III h. 



Note.— This species exhibits no distinct saw teeth 

 (serratures) above its edges ; but only undulations as 

 ^"^"'"'' ^ " - bases of the hair like spines which take the place of 

 teeth in other species. 





