1865.] DAWSON COAL-FORMATION. 149 



Yar. I, Knorroides. Prominent bosses or ridges instead of areoles. 

 These are imperfectly preserved specimens. 



The varieties a, h, c, e, i, have been seen attached to trunks of 

 Sigillarice of the group distinguished by broad and prominent ribs — 

 Sigillaria proper of the above arrangement. Stigmarice, like Sigil- 

 laricBf are exceedingly abundant in the Middle Coal-measures, and 

 are comparatively rare in the Lower Carboniferous and newer Coal- 

 formations. 



Calamodendron, Brongn. 



1. Calamodendron approximatttm, Brongn. PI. YII. fig. 31. 



This plant is evidently quite distinct from Oalamites proper. The 

 Calamite-like cast is a pith or internal cavity, surrounded by a thick 

 cylinder of woody tissue consisting of scalariform vessels and woody 

 fibres with one row of round pores ; external to this is a bark of 

 cellular and bast tissue. The structure appears to be allied to that 

 of Sigillariaf and is one of the most common in the beds of bitu- 

 minous coal. 



M. C, Sydney (R. Brown) ; M. C, Joggins, Pictou (/. TT. D.); 

 Coal Creek (C. B. Matthew). 



2. C. OBSCURUM, spec. nov. PI. VII. fig. 31 d. 



This is a Calamite-like fragment found in a block of Sydney coal, 

 in the state of mineral charcoal. The external markings are obscure, 

 but the structure is well preserved. It differs from the last in 

 having large ducts with many rows of pores, or reticulated instead 

 of scalariform vessels. This is perhaps a Calamite. 



M. C, Sydney (J. W, D.), 



Cyperites, L. & H. 

 Ctperites ? 



These elongate linear leaves have two or three ribs, and the 

 central band between the ribs raised above the margin ; one species 

 has been seen attached to Sigillmia SchlotJieimiana. 



The leaves of Sigillaria elegans are different, being as broad as 

 the areoles of the stem, and with several parallel veins. 



Middle and upper coals, everywhere. 



Antholithes, Brongn. 



1. Antholithes Rhabdocarpi, spec. nov. PI. YII. fig. 30. 



Stem short, interruptedly striate, with two rows of crowded ovate 

 fruits, and traces of floral leaves. Pruits half an inch long, striated 

 longitudinally, attached by short peduncles. 



M. C, Grand Lake ((7. F. Hartt). 



2. A. PTGMJEA, spec. nov. PI. VII. fig. 30 c. 



B/hachis 1 inch thick, rugose ; two rows of opposite flowers, each 

 showing four lanceolate striate floral leaves, two outer and two 

 inner. 



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



VOL. XXII.-— PART I. M 



