Palaeontolosie. 217 



'S) 



either the drop mechanism remained in Operation for a prolong:ed 

 period or eise the pollen was discharged into the air at no great 

 distance in dense clouds. Otherwise, some such agenc}^ of transport 

 as insects must have come into pla}'. 



The question of the validity of the presumption that pollen pre- 

 sent in the pollenchamber of a fossil seed really belongs to the 

 plant is of importance as it is apt to lead to the correlation of 

 detached microsporangia. The author thinks it is justifiable to con- 

 tinue to draw the usual inference seeing that the pollen found is 

 nearly alwa3'S pure. W. B. Turrill (Kew). 



Scott, D, H. and E. C. Jeffrey. On fossil plants showing 

 structure, from the base of the Waverley Shale of 

 Kentucky. (Phil. Trans. Roy. Soc. Lond. CCV. p. 315—373. 1914.) 



The material on which the present memoir was based was 

 obtained by Prof. Charles Eastman and Mr. Moritz Fischer 

 at a locality about one mile west of Junction City in Boyle 

 County, Kentucky. The nodule layer is a well marked Stratum 

 20 to 24 inches thick, lying at the base of the Waverley (Lower 

 Carboniferous) and immediately above the Genessee Black Shale of 

 Upper Devonian age. 



Six plants belonging to six genera afe described, and all the 

 species and two of the genera are new to science. 



Calamopitvs americana has the following important characters: 

 the pith is mixed, containing tracheides in all parts, there are 

 paired leaftrace bundles in the wood, and there is considerable 

 development of secondary tissue around the leaftrace bundles, 

 extending to the inner as well as the outer surface. Accompanying 

 this Calamopitys is a Kalymma which probably belongs to it as the 

 petiole. 



Calainopteris Hippocrepis is a very characteristic petiole, no 

 doubt allied to Kalynitna. The vascular system of the petiole forms 

 a horse-shoe with a marked invagination at the bend; the lateral 

 bundles form continuous bands; the bundles are collateral and the 

 xylem mesarch. 



Periastrum perforatum was probably a petiole. The symmetry 

 is bilateral; the vascular bundles are confined to a straight median 

 row; the cortical tissue on either side of the median band is perfo- 

 rated by numerous lacunae. 



Stereopteris anmilaria (gen. et sp. nov.) was probably the petiole 

 of a fern, and finds its place among the PrimofiUces of Arber 

 (Coenopterideae of Seward), and on the imperfect evidence avai- 

 lable appears to stand nearest to the Zygopterideae. The petiole is 

 somewhat elliptical in transverse section and traversed by a Single 

 bündle; the xylem plate is enlarged at the middle and at.the two 

 ends, is slightly curved and consists of a solid mass of scalariform 

 tracheides. 



Archaeopitys Eastmanii (gen. et sp. nov.) represents a new type 

 of Stern belonging to the family Pityeae. The pith is continuous, 

 not discoid and is traversed in all parts by mesarch Strands of 

 primary xjdem; circum-medullary xylem-strands, also mesarch, 

 are present at the inner edge of the wood; the medullary Strands 

 pass outwards one by one each fusing with a circum-medullary 

 Strand; new Strands appear in the pith to replace those which have 

 passed outwards. The secondary wood is of a Cordaitean character, 



