1858.] DAWSON LOWER COAL-MEASrEES. 69 



The first and third of these species are found in the middle coal- 

 measures ; but I have not seen the second from these : it corresponds 

 in some respects with No. 28 of Mr. Bunbury's List of Plants from 

 Sydney ; but I have no specimen or figure of that species for com- 

 parison*. 



The only other fossil in my collection belonging to this genus is a 

 fragment of a Lepidostrobus, showing merely the rhomboidal marks 

 left by the fall of the scales. 



AU the species aboved noticed are of the slenderly-branched type 

 represented by L. elegans. 



Along with the Lepidodendra are found many stems, which, at 

 first sight, I was disposed to refer to Knorria as represented by the 

 Knorria imhricata (Sternberg). A careful comparison of a number 

 of specimens has, however, convinced me that they are merely 

 decorticated specimens of Lepidodendron, especially L. elegans. In 

 many such specimens the areoles are represented by ovate elevations, 

 sometimes presenting an imbricated appearance. K. imhricata has 

 been ascertained by Goeppert to resemble Lepidodendron in structure ; 

 and I suspect that most, if not all, the specimens of the species are 

 imperfectly-preserved stems of Lepidodendra. K. taxina (L. and H.) 

 is probably distinct generically from these lepidodendroid Knorrias. 



2. Sigillarice. — I have but one species of Sigillaria from the 

 lower coal-measures. It occurs at Horton, a specimen from which 

 place was presented to me by Professor Stewart, of Acadia College. 

 I have found the same or a similar species at the North Eiver of 

 Onslow, in coal-measures very near the base of the system. Both 

 are ligneous casts, and imperfectly preserved ; but in their present 

 state they cannot be distinguished from S. a^agusta of Brongniart, a 

 slenderly-ribbed species, not very dissimilar in its ligneous surface 

 from S. pachy derma, which is found in the lower coal-measures in 

 Scotland (Page). 



A Stigmaria not distinguishable from S. Jicoides occurs at Horton ; 

 and Dr. Harding has a specimen with those peculiar stellate wrinkles 

 which Hugh Miller has remarked on specimens from the Scottish 

 lower coal-measures {S. stellata). Cylindrical rootlets, probably of 

 Stigmaria, fill some of the beds at Windsor Brook, and may indicate 

 soils in which Sigillarice have grown. 



3. Filices. — The only Fern hitherto found in the Horton beds was 

 discovered by Professor Stewart. It corresponds with Sphenopteris 

 adiantoides of Lindley and Hutton, obtained by them from the 

 Jarrow colliery. 



At Moose Eiver, on the north side of Cobequid Bay, in beds which 

 I believe belong to the lower coal-measures, another Pern has been 

 found ; it is identical with Pecopteris ManteUii (L. and H.). This 

 is the species called P. heterophylliim in my * Acadian Geology.' 



A beautiful specimen from Horton presents a dichotomous leaf, 

 with parallel veins, having the general aspect of Acrostichium or 

 Schizea ; I presume it belongs to Brongniart's genus Schizopteris. 



* Quart. Journ. Geol. Soc. vol. iii. 



