SPENCER — NIAGARA FOSSILS. 58/ 



corneous with surface more or less regularly striated, leaving in 

 some places small oval impressions (probably the orifices of the 

 cellules.) 



Of this species I have seen only one good specimen (and tw^o 

 inferior fragments whieh probably belong here). The frond is 

 six centimetres high, and of still greater breadth. One of the 

 branchlets at the dichotomous termination is much more slender 

 than the other (a sort of lateral pustule), indicating probably the 

 commencement of the growth of a new branch. 



The general form of this species is like /. de^us (Hall & Whit- 

 field), but it is much larger in size, having more diffused branch- 

 es, with an entire absence of prong-like processes from its sides. 



Formatioti arid Locality. — The type of this species was obtained 

 by Col. Grant, near the base of the '' cherty-bed" at the Jolly-cut, 

 Hamilton, Ontario, in the Niagara dolomite. 



Inocaulis cervicoknis, nov. sp. 



Plate 5. Fig. o. 



Frond consisting of stipes having a common origin, and rising 

 above into a few stout, widely extended, bifurcating branches, 

 averaging from 1.5 to 2 mm. in breadth, and terminating in di- 

 chotomous points of equal thickness ; texture corneous, with a 

 striated surface. 



Owing to the striations the appearance of the surface is that of 

 rough scales or fibres, somewhat resembling the exterior portion 

 oi I. plumulosus. In the growing state, the branches appear to 

 have been strengthened by longitudinal fibres — solid corruga- 

 tions — and the cells to have been arranged vertically between 

 them. A portion of the branches show a solid central axis, with 

 a common canal surrounding it. The general arrangement of 

 the branches resembles that of the horns of the American elk. 



The typical specimen consists of six principal stipes, each about 

 three centimetres long, with only a few branches. These stipes 

 are united by a common runner (in the botanical sense), so that 

 the whole organism is five centimetres broad, and three centime- 

 tres high. 



Forjnation a?id Locality. — This rare and beautiful species occurs 

 in the shaly dolomites of the "blue building-beds" of the Niagara 

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



iv— 4 — 3 • [May, 1S84 



