GUAFTOLITES OF NEW YORK, PART 1 635 



Graptolithus octobrachiatus Hall. Canadian Organic Remains, decade 2. 



1865. p.96, pl.7, fig.1-7 ; pi. 8, fig.1-4 

 Dichograpsus octobrachiatus Nicholson, Quar. Jour. Geol. Soc. 1868. 



24:129, pl.5, fig.l, 2 

 Dichograptus octobrachiatus Nicholson. Monogr. Brit. Grapt. 1872. 



p.l07, fig.50 

 Graptolites (Didymograpsus) octobrachiatus McCoy. Geol. Sur. 



Yictoria. Prodr. Pal. Victoria, decade 1. 1874. p. 17, pl.2, fig.4 

 Loganograptu s kjerulfi Herrmann {ex parte) Nyt Mag. Nature. 1882. 



27:341-62 

 Dichograptus octobrachiatus Brogger. Die silurischen Etagen 2 and 3. 



1882. p.38 

 Dichograptus octobrachiatus Herrmann. Nyt Mag. Naturv. 1886. 



29:124 

 Dichograptus octobrachiatus Herrmann, Geol. Mag. Dec. 3, 1886. 3:22, 



fig-'? 

 Dichograptus octobrachiatus Lecrenier. Ann. de la Soc. Geol. de Belg. 



1887. 14:182 

 Dichograptus octobrachiatus et hexabrachiatus Malaise. Ann. de la 



Soc. Geol. de Belg. 1888. 15:40-44 

 Dichograptus octobrachiatus Ami. Geol. Sur. Can. Rep't, 8er2. 1889. 



V.3, pt2, p.ll7k 



O 



Dichograptus octobrachiatus Tornquist. Lunds Univ. Arsskrift. 1891. 



26:12, pl.l, fig.l 

 Dichograptus octobrachiatus Gurley. Jour. Geol. 1896. 4:294 

 Dichograptus octobrachiatus Roemer & Freeh. Lethaea palaeozoica. 



1897. 1:595 

 Dichograptus octobrachiatus Elles. Quar. Jour. Geol. Soc 1898. 



54:483 

 Dichograptus octobrachiatus Ruedemann. N. Y. State Paleontol. An. 



Rep't. 1902. p. 554,556 

 Dichograptus octobrachiatus Elles & Wood. Monogr. Brit. Grapt. ptl. 



Pal. Soc. for 1902. 1902. p.77, pl.9 ; pl.lO, fig.la-e 



Descrvption. Nema and primary disk not observed. Sicula apparently- 

 short and stout (about 1 . 1 mm long). Rhabdosome consisting of branches of 

 three orders, those of the first order (fnnicle) together about 2 mm 

 long, dividing dichotomously at either end. The four branches of the 



