148 PEOCEEDINGS or THE GEOLOGICAL SOCIETY. [DoC. 20, 



19. S. (Fay.) Bretofensis^ spec. nov. PL VII. fig. 27. 



Like S. tessellata, but areoles more hexagonal, bark thin and smooth 

 on both sides, and furrow above the scars arcuate and with a central 

 punctiform elevation. 



M. C, Sydney (B. Brown). 



20. S. EMiNENS, spec. noY. PI. VI. fig. 24. 



Like S. ohovata, Lesqx., but with narrower ribs, and larger and 

 less distant areoles, each with a slight groove above. 

 M. C, Sydney (E. Broivn). 



21. S. DouRNAiN^sii, Brongn. 

 M. C, Joggins {J. W. D.). 



22. S. Knoreii, Brongn. 



M. C, Sydney {B, Brown). 



Syringodendrok, Brongn. 



Obscure specimens, referable to a narrow-ribbed species of this 

 genus, occur in the Lower Carboniferous beds at Horton and Onslow. 



Stigmaeia, Brongn. 

 Sttgmaeia ficoldes, Brongn. PL XII. fig. 83-87. 



Under this name I place all the roots of SigiUarice occurring in 

 the Carboniferous rocks of Nova Scotia. They belong, without 

 doubt, to the different species of Sigillarioid trees; but it is at present 

 impossible to determine to which ; and the specific characters of the 

 Stigmarice themselves are, as might be anticipated, evanescent and 

 unsatisfactory. The varieties which occur in jN'ova Scotia, discard- 

 ing mere difference of preservation, may be arranged as follows : — 



Var. a. Areoles large, distant ; bark more or less smooth. This is 

 the most common variety, and extends throughout the Coal-formation. 



Var. h. Areoles large, separated by waving grooves of the bark. 



Var. c. Similar, but ridges as well as furrows between the 

 areoles ; var. undulata of Goeppert. 



Var. d. Areoles small, separated by waving grooves. 



Var. e. Areoles moderate, in vertical or diagonal furrows separated 

 by ridges ; var. sigillarioides of Goeppert. 



Var. /. Areoles small ; bark finely netted with wrinkles or striae. 



Var. g. Areoles surrounded by radiating marks, giving a star- 

 like form ; var. stellata of Goeppert. The only specimen I have 

 seen was found by Dr. Harding in the Lower Carboniferous Coal- 

 measures of Horton. 



Var. h. Areoles small, or obscure and infrequent. Surface covered 

 with fine uneven strise. Mj specimens were collected by Mr. Brown 

 in the Middle Coal-measures at Sydney. 



Var. i. Areoles narrow, elongate, bark smooth or striate. 



Var. Jc. alterncms, with areoles in double rows on broad ribs sepa- 

 rated by deep furrows. Probably old furrowed roots. 



