DENDROID GRAPTOLITES OF HAMILTON, ONTARIO. 13 



tation from Euedemann's discussion of the genus « will suffice for its 

 recognition. 



-Hall based liis genus mainly on its mode of branching and the resulting 

 aspect of the rhabdosome; stating that it has "numerous slender bifurcating 

 branches proceeding from a strong stem or axis," and that in its aspect it is 

 intermediate between Diciyoneuia and some forms of Dcndrfxjraijtus ; that the 

 branches are sometimes distantly and irregularly united by transverse dissepi- 

 ments, but that the frond has not the regular reticulate structure of Dictijo- 

 ncnia and differs from Dcndroyraptus in the mode of branching and the form 

 of the thecse. 



Genotype.— Callograptua elegans Hall. Tetragraptus zone of 

 Quebec group, Gros Maule, Canada. 



CALLOGRAPTUS MULTICAULIS Spencer. 



Text figure 14. 



Callograptus. iDcndrogmptus) tnulticauUs Spencer, Canadian Nat., X, 1882, 

 p. 165, nomen nudum. 



Callograptus mtdticaulis Spencer, Trans. Acad. Sci. St. Louis, IV, 1S84, p. 

 572, pi. 1, fig. 11 ; Bull. Mus. Univ. State Missouri, I, 1884, p. 22, pi. 1, 

 fig. 11.— GuRLEY, Journ. Geo]., IV, 1896, pp. 93, 308. 



The original description is as follows: 



Frond flabellate, possibly funnel-shaped in its growing state ; branches, with 

 two or three bifurcations, strong and somewhat numerous. Surfaces deeply 

 striated longitudinally. The branches radiate from a common radicle until 

 they occupy three-fourths of a circle; but whether they extended all around, 

 and the frond grew in a funnel shape, can not be determined, as the lower 

 branchlets are crushed and obscured. This beautiful little fossil has about 

 a dozen principal branches well preserved, and these are about half a milli- 

 meter broad, with rather greater space between. The length of each branch 

 is slightly over a centimeter, and the breadth of the frond about double that 

 measurement. Cells are not known. 



Formation and locaHty. — This graceful fossil was obtained from a more 

 shaly bed of dolomite below the " chert bed " in the Niagara formatiun, at the 

 " Jolly-cut road," Hamilton, Ontario. 



No additional specimens of this species have been noted in the 

 various collections studied. 



CALLOGRAPTUS NIAGARENSIS Spencer. 



Text figure 15. 



Callograptus niagarcnsis Spencer, Canadian Nat., VIII, 1878, pp. 458, 463; 

 Trans. Acad. Sci. St. Louis, IV, 1884, pp. 564, 571, pi. 1, fig. 9; Bull. 

 Mus. Univ. State Missouri, I, 1884, pp. 14, 21, pi. 1, fig. 9.— Miller, 

 North Amer. Geol. and Pal., 1889, p. 175, fig. 141.— Gurley, Journ. 

 Geol., IV, 1896, pp. 93, 308. 



Doctor Spencer's original description is as follows: 



Frond flabellate; the slender bifurcating branches more or less parallel, with 

 occasional transverse filaments. The form is nearly semicircular with the 



a New York State ]Museum, Memoir 7, 1904, p. 583. 



