5y& TRANS. ST. I.OUIS ACAD. SCIENXE. 



Inocaulis phycoides, nov. sp. 

 Plate 5. Figs. 6 & 7. 



Stem flattened and from two to three millimetres broad ; 

 branches fastigiate, and originating on both sides of the principal 

 stipe at frequent irregular intervals, and clividing near their ter- 

 minations into two stout branchlets (from three-fourths to one and 

 a half centimetres long), each ending in dichotomous free points. 

 Texture corneous, with a surface apparently composed of scaly 

 fibres. 



Of this species, the fossils are not very well preserved. There 

 is some indication of a central axis. This species is easily distin- 

 guished from /. flumulosus by the close, regularly arranged, pa- 

 rallel branches from each side of the principal stipes, and by their 

 terminal branches. The fronds appear to have grown in groups, 

 but whether they are connected at the base or not is unknown. 

 If not connected, the individual fronds (in the specimens under 

 consideration) are about four centimetres high and three broad, 

 with from three to five principal branches on either side of the 

 central stipe (the branches are more numerous on one side than 

 the other). The character of the cellules is unknown. 



Fortnaiion and Locality, — Inccaulis phycoides occurs in the 

 dolomitic limestones of the Niagara formation, at the "Jolly-cut" 

 quarries, Hamilton, Ontario. 



Inocaulis ramulosus, nov. sp. 



Plate 6. FiR. 1. 



Frond consisting of numerous flattened bifurcating branches, 

 originating in and radiating from a common radicle, composed 

 of solid chitinous matter ; branches averaging two millimetres in 

 breadth for the larger, and one mm. for the smaller, towards the 

 margin of the frond, where the branchlets end in two (sometimes 

 three) extensions of unequal thickness. Texture corneous, with 

 the surface composed of scaly fibres. Extending longitudinally 

 through the stipes are central or subcentral elevations (sometimes 

 depressions), indicating a solid central axis. 



This species is described on two specimens, one of which 

 shows the origin and base of the radiating branches, and the other 

 the general frond, although the radicle is concealed. The ex- 

 treme width of the typical specimen is fourteen centimetres, and 

 the height eight centimetres. 



