[MATTHEW] FLORA OF THE LITTLE RIVER GROUP NO. II 93 



at the same distance from the last fork, and so is of remarkable regular- 

 ity in its branching : in the subdivisions a central axis is not always evi- 

 dent, but in well preserved examples we find one arising near the middle 

 of the branch and extending to the next fork, where it also forks and 

 runs along the margin of the new branch for some distance. The stem 

 or leaf is three or four times dichotomous, and becomes almost thread- 

 like in the terminal divisions. No fruit has been found. 



It is difficult to suggest possible affinities for this plant, and it is 

 only left under Psilophyton because its relationships are still obscure. 

 One might suggest a comparison with the leaves of Calamités geniculosus 

 which divide in a similar exact manner, but the broad and long stems 

 referred to Psilophyton glahrum by Sir Wm. Dawson hardly admit of 

 such comparison, the divisions also are spreading and not approximated 

 as in that species. 



On the other hand, the leaves of some of the lacineate Sphenophylli 

 divide in a similar way, but these have a strong mid-rib even to the ulti- 

 mate divisions, and the leaves are on a much smaller scale. 



Horizon and Locality. — So far as I know, this plant belongs only to 

 Bed No. 1 of Hartt's section, which is near the top of the Dadoxylon 

 Sandstone. 



Size. — From the stems two lines (5 mm.) in width, and in some case 

 a foot long, described by Sir Wm, Dawson this plant is reduced by dicho- 

 tomy to a millimetre and less. T have no reason to suppose it was a 

 root, though the larger stems (or leaves) do resemble examples of Pinna- 

 laria dispalans, but the rootlets and irregular branchlets of that form are 

 quite absent from this. 



I think Dawson's fig. 79&, Fossil Plants Dev. and Sil. Can., is not 

 this plant, the dichotomy is not equal. It may be part of the rachis of a 

 fern. 



Lepidocalamus. pi. VI, Fig. 4. 



Sir William Dawson placed the type of this genus L. scutiger, pro- 

 visionally as he says, under Asterophyllites.^ In addition to and in con- 

 firmation of what he has said, (and the author has written later in refer- 

 ence to this species,^) an example of a branch collected by Mr. W. J. 

 Wilson and now in the collections of the Geological Survey of Canada, 

 may be cited and described. This fossil exhibits seven whorls and the 

 final bud of the branch : in the lower part it is split through the middle 

 of the stem, but in the fifth and sixth whorls shows only the bracts or 

 leaves behind the stem : of these four or five are visible, so there would 



1 Flora of the Devon, periorl in Northeastern America, Quart. Jour. Geol. 

 Soc, XVIII, p. 311. 



2 Trans. Roy. Soc. Can., Sec. Ser., Vol. XII, Sec. IV, p. 117. 



