326 NEW YORK STATE MUSEUM 



Dicranograptus ramosus Ami. Can. Geol. Sur. Rep't. Ser. 2, v. 3, pt 2. 1889, 



P.117K 



Dicranograptus ramosus "Walcott. Geol. Soc. Bui. 1890. 1:339 



Dicranograptus ramosus Gurley. Jour. Geol. 1896. 4:297 



Dicranograptus ramosus Roemer & Freeh. Lethaea Pal. 1897. 1:616, fig. 180 



Dicranograptus ramosus Gurley. Geol. Sur. Ark. An. Rep't. 1892. 3:411 



Dicranograptus ramosus (?) T. S. Hall. Roy. Soc. Victoria Proc. v. 9, pi. 1. 



1896. p. 184 



Dicranograptus ramosus T. S.Hall. Geol. Mag. n. s. Dec. 4, 1899. 6:445 

 Dicranograptus ramosus Ruedemann. N. Y. State Mus. Bui. 42. 1901. 



p.496ff 



Dicranograptus ramosus T.S.Hall. Geol. Sur. Victoria Rec. v. 1, pt 1. 1902. 



P-33 

 Dicranograptus ramosus Fearnsides Sec. C. Belfast. 1902. Separates, p. 1 

 Dicranograptus ramosus Clark. Geol. Mag. Ser. 4. 1902. 9:498 

 Dicranograptus ramosus Weller. Geol. Sur. N. J. Pal. 1903. 3:53 

 Dicranograptus ramosus Elles & Wood. Monogr. Brit. Grapt. (Pal. Soc. 1904) 



p. 175; pi. 24, fig. 6a, b 

 Dicranograptus ramosus Dale. U. S. Geol. Sur. Bui. 242. 1904. p. 33 

 Non Dicranograptus ramosus Beecher. N. Y. State Mus. Nat. Hist. 36th An. 



Rep't. 1883. p. 78 



Description. Rhabdosome consisting of a biserial portion which varies 

 in length from 10 to 15 mm, the latter being a maximum, apparently not 

 surpassed, and two gently concave uniserial branches forming an angle 

 that most frequently is 25 but may rise to 30 or over ; and attaining a 

 length of 185 mm and more. The biserial portion has, in the typical speci- 

 mens, an initial width of .7 mm and gradually increases to 1.8 mm ; it con- 

 sists of 13-18 nonspinose thecae on either side and is divided by a distinct 

 septum from the second pair of thecae upward. The uniserial portion is 

 frequently a little narrower (by almost .2-4 \\\\\\) at its beginning than the 

 remainder of the branch which is of uniform width (1— 1.4 mm, with 1.2 as 

 the prevailing average)'; the branches form, in the majority of the speci- 

 mens, first an angle of about 40 , which at a distance of about 10 mm, is 

 somewhat abruptly changed into the smaller angle given above. The 

 branches are thence apparently straight, but in the most complete specimens 



