572 TRANS. ST. LOUIS ACAD. SCIEN'CE. 



quarter of a millimetre broad, while the stipe is al)out double that 

 thickness. 



This exceedingly beautiful frond in general appearance closely 

 resembles C. salteri of the Quebec group, but somewhat small- 

 er, although there is some variation in the size of this species. 



Formation and Locality. — This species occurs on the shaly sur- 

 faces of the Niagara dolomites at Hamilton, Ontario. 

 Callograptus multicaulis, nov. sp. 



Plate I. Fig. 11. 



Fond 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, cannot 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 millimetre broad, wnth rather greater space be- 

 tween. The lergth of each branch is slightly over a centimetre, 

 and the breadth of the frond about double that measurement. 

 Cells are not known. 



For7nation and Locality. — This graceful fossil was obtained from 

 a more shaly bed of dolomite, below the " chert bed" in the Nia- 

 gara formation, at the "Jolly-cut road," Hamilton, Ontario. 

 Callograptus minutus, nov. sp. 



Pl.ite I. Fit;. l-.>. 



Frond orbicular. Branches, with one or two bifurcations, re- 

 gularly diverging from the initial point like the venations of a 

 palm-leaf: they are all free. The surfaces are striated. The 

 branches do not exceed one-fifth of a millimetre in breadth, and 

 are about half a millimetre apart. The whole height of the frond 

 is a centimetre, and the greatest breadth somewhat less. 



Formation and Locality. — This species occurs in the Niagara 

 dolomite at Hamilton, Ontario. 



Genus DICTYONEMA (Hall). 



Gr. diktuon, a net; nema, a tlire.ad. 



(Paleontology of New York, vol. ii.) 



"Frond circular or flabelliform, composed of slender radiating 

 branches which frequently bifurcate as they extend towards the 



