THE FLORA OF THE COAL FORMATION. 491 



Cakdiocarpum, Brongn. 



1. Cardiocarpum Jluitans, S])cc. nov. (Fig. 173, I). Oval; apex 

 entire or notched ; surface slightly rugose ; nucleus round ovate, 

 acuminate, pitted on the surface, with a raised mesial line. M, C, 

 Joggins (J. W. D.). 



2. C. hisectum, spec. nov. (Fig. 173, K). Nucleus as in the last 

 species, but striate ; margin widely notched at apex, and more nar- 

 rowly notched below. M. C, Grand Lake, Springhill (C. F. Hartt). 



3. Cardiocarpum, sp. like C. marginatum. M. C, Joggins (J.W.D.). 



4. Cardiocarpum^ sp. allied to C. latum, Newberry. M. C, Pictou 

 (H. Poole). These Cardiocarpa are excessively abundant in the roofs 

 of some coal seams ; and the typical ones must have been samaras or 

 winged nutlets. They must have belonged to pha^nogamous plants, 

 and certainly arc not the fruits of Lepidodendron, though some of the 

 spore-cases of this genus have been described as Cardiocarpa. These 

 I propose to place under the provisional genus Sporangites. 



Sporangites, Dawson. 



1. Sporangites papillata, spec. nov. (Fig. 173, L). I propose the 

 provisional generic name of Sporangites for spores or spore-cases of 

 Lepidodendron, Calamites, and similar plants, not referred to the 

 species to which they belong. The present species is round, about 

 one inch in diameter, and covered with minute raised papilla3 or spines. 

 It abounds in the roof of several of the shaly coals in the Joggins 

 section, and especially in one in group 19 of that section. M. C, 

 Joggins (J. W. D.). 



2. S. glabra, spec. nov. (Fig. 168, F). About the size of a mustard- 

 seed, round and smooth. Exceedingly abundant in the Lower Car- 

 boniferous Coal measures of Horton Bluff, with Lepidodendron corru- 

 gatum, to which it probably belongs. A similar spore-case, possibly 

 of another species of Lepidodendron, occurs rarely in the Middle Coal 

 formation at the Joggins. 



Sternbergia, Artis. 



This provisional genus includes the piths of Dadoxylon, Sigillaria, 

 and other plants, usually preserved as casts in sandstone, retaining 

 more or less perfectly the transverse partitions into whieli the pith- 

 cylinders of many coal formation trees became divided in the process 

 of growth. These fossils are most abundant in the Upper Coal for- 

 mation, but occur also in the Middle Coal formation. The following 

 varieties may be distinguished : — 



(a.) Var. approximata, with fine uniform transverse wrinkles. This 

 is usually invested with a thin coating of structureless coal. 



