52 



FOSSIL PLANTS. 



Their arrangement appears to me to show that they were contained in a Sporangium, 

 and were Macrospores, rather than separate Sporangia, attached to the surface of the 

 scales, as Mr. Carruthers described was the case in his specimen ; ^ and hereinafter they 

 will be termed Macrospores. 



This specimen also shows the Macrospores only on the lower, and not on the upper, 

 part of the Cone. The outside of the scales is not very well shown ; but their quincuncial 

 arrangement and the form of the scar, where they were attached to the column, are both 

 very clearly shown, and cannot be distinguished from such parts in Lepidostrobus or the 

 leaf-scars of Lepidodendron. It is named Lepidostrobus RmselUanus from Mr. Russell, 

 who discovered the specimen. 



Specimen No. 22, Lepidostrobus liussellianus. Plate IX, figs. 2 and 2 a. 



Fig. 2, of natural size, is another compressed, imperfect Cone of Lepidostrobus 

 Russellimins, four inches long, nine tenths of an inch in breadth, and having a column 

 one tenth of an inch across. The upper part is wanting ; but what of the lower portion 

 now remains shows Sporangia, of a somewhat oval form, springing nearly at right angles 

 from the column, and full of Macrospores, only one thii'ty -second of an inch in diameter 

 but similar in all other respects to those described in the last specimen, No. 21; and 

 like it, the base and apex of the Scale or Bract and the Sporangium-wall are not well 

 shown, all these parts being converted into bright coal, so that none of them can be 

 clearly distinguished. The scars on the column of the Cone shows that the Scales were 

 arranged spirally around the axis. 



Fig. 2 a (magnified five diameters) shows a portion of the column of the Cone, with 

 traces of the Bract-scars, and a single Sporangium, containing fourteen Macrospores, 

 arranged in a double series, like those in Specimen No. 21, except that the odd one at 

 the end is here wanting. The Macrospores have their outsides formed of a yellowish 

 paraftine, covered with granular bisulphide of iron. Their insides contain bright granules 

 of bisulphide of iron, which at first sight might be mistaken for Sporules. 



As this Cone is not to be distinguished from No. 21, it has also been called Lepi- 

 dostrobus Bussellianus. It is also from a Blackband Ironstone near Airdrie. 



§ 3. Specimen No. 23, Lepidostrobus (?) dubius, sp. nov. Plate IX, figs. 3, 3 a. 



Specimen No. 23, Plate IX, fig. 3, is another imperfect, compressed Cone, from the 

 Blackband Ironstone, near Airdrie, four inches in length, six tenths of an inch in 

 breadth, with a column one twelfth of an inch wide. All the Cone exposed shows 



' ' Geological Magazine,' vol. ii (No. XVI), p. 434. 



