1865.] DAWSON — CO AL-POPvMATION". 165 



Cardiocaepum, Brongn. 



1. Cardiocarpum pluitans, spec. nov. PI. XII. fig. 74. 



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. BiSECTUM, spec. nov. PI. XII. fig. 73. 



!N"ucleus as in the last species, but striate ; margin widely notched 

 at apex, and more narrowly notched below. 

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



3. Cardiocaepum, sp. like C. marginatum, 

 M.C.,Joggins(J". IF.i).). 



4. Cardiocaepum, 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 phaenogamous plants, and 

 certainly are 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 JSporanc/ites. 



Spoeangites, Dawson. 



1. Sporangites papillata, spec. nov. PI. XII. fig. 80. 



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 1 inch in diameter, and covered with minute raised 

 papillae 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. PI. XII. fig. 81. 



About the size of a mustard-seed, round and smooth. Exceed- 

 ingly abundant in the Lower Carboniferous Coal-measures of Horton 

 Bluff, with Lepidodendron corrugatum, to which it possibly 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 which 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) Yar. approocimata, with fine uniform transverse wrinkles. This 

 is usually invested with a thin coating of structureless coal. 



VOL. XXII. PART I. N- 



