GRAPTOLITES OF NEW VORK, PART 2 329 



a Dicranograptus ramosus var. arkansasensis Gurley 

 Dicran.ogr aptu s arkansasensis Gurley. Geol. Sur. Ark. An. Rep't. 1X92. 



3:410; pi. 9, fig. 1, 2 

 Dicranograptus nicholsoni arkansasensis Gurley. Jour. Geol. 1896. 



4: 72 

 Cf. Dicranograptus ramosus Elles & Wood. Monogr. Brit. Grapt. pi 4. (I'M. 

 Soc. 1904) pi. 24, fig. 6b 

 Gurley's brief description of this species, given in his preliminary 

 publication, is : 



257 



Fig. 257, 258 Dicranograptus ramosus var. arkansasensis Gurley. Copies of Gurley's figures 

 in Geological Survey of Arkansas, Annual Report 1892. Drawing too wide by one half 



Proximal portion 9 mm long ; branches diverging at an angle of 90° to 

 130 , curving upward at a short distance from their origin so as to include 

 a smaller angle ; thecae 20 in the space of 25 mm ; nonspinose. 



Horizon and locality. Lower Dicellograptus zone, Arkansas. 



We have nothing to add to this description from an inspection of the 

 type material, the specimens being so poorly preserved that barely more 

 than the general outline of the rhabdosomes can be made out. As we have 

 remarked before, this form is quite probably identical with the variety of 

 D. ramosus recognized by Elles and Wood in Great Britain, but not 

 named by them. In general outline it closely agrees with our D . 

 s p i n i f e r var. g e n i c u 1 a t u s , except that the biserial portion is shorter, 

 indicating thereby and by the nonspinosity of the thecae its closer relation- 

 ship to D. ramosus than to D. spinifer. The flexure in the 

 Arkansas specimens is almost as abrupt as in the variety from New York, 

 but not brought out sufficiently in the original drawings. 



