GRAPTOLITES OF NEW YORK. VXUT 1 617 



might be observed in a delicaie Clouograptus form in the angles at which 

 the stipes of various orders were inclined to each other." For, if we con- 

 sider the rhabdosome to have been free floating or attached to some 

 floating body, and its branches as flexuous, it is obvious that the latter 

 might ultimately come to rest in quite different positions. 



Staurograptus dichotomus vai-. apertus var. nov. 



Plate 2, figures 22-24 



There have been found in the Upper Cambric beds of Schaghticoke and 

 of Hillsdale near Granville, specimens of S . dichotomus which contrast 

 with the great majority of the individuals by their greatly reduced bifurca- 

 tion and a correspondingly much smaller number of branches. The latter 

 appear, in the extreme cases, as the original of figure 22, to have but 

 branches of the first two orders. There are no differences observable in 

 the character of the thecae and transitional forms, as the one reproduced in 

 figure 23 demonstrates the close connection of these forms with the types of 

 the species. 



This variety bears some similarit}^ to Grraptolithus milesi Hall 

 [Geol. Vt. 1861, 1:372, figured v. 2; 1861, pl.l2, fig.2-4] in the mode of its 

 branching and the character and number of its thecae. It has in the 

 preliminary paper cited above [1903, p.938] been referred provisionally to 

 that species. A direct identification is prohibited by the statement of the 

 presence of a horizontal " f unicle "in G . milesi, which species then is to 

 be referred to Clouograptus^, 



^This species has been referred by Nicholson [1876, p. 248] to his new genns 

 Temnograptus. Herrmann did not recognize that genus [1886, p. 25] and referred its 

 species to Clonograptus ; while Freeh [1897, p. 596] follows Nicholson, and refers both 

 species, Temnograptus milesi and T . multiplex, to Temnograptus, sug- 

 gesting that they may be identical. A comparison of the drawings of Clono- 

 graptus milesi with those furnished of Temnograptus multiplex bj 

 Nicholson Iqp. eit.] and Elles {op. cit. p.479, fig.6] leaves however no doubt that in the 

 former species the branching is typically dichotoraous, while in Temnograptus it is 

 monopodial or lateral, notwidistanding the fact that Nicholson and Elles cite the wholly 



