<iO MR ROBERT KIDSTON ON 



EXPLANATION OF PLATES. 



Plate I. 



Fig. 1. Sigillariostrobus rhombibractiatus, n. sp. Lower portion of cone and pedicel, showing axis 

 denuded of bracts on upper part. Natural size. Loc. Monckton Main Colliery, near Barnsley, Yorkshire. 

 /for. Barnsley Thick Coal. Middle Coal Measures. Mr W. Hemingway, Collector. Reg. No. 2263. 

 P. 51. 



Fig. 2. Sigillariostrobus rhombibractiatus , n. sp. Lower portion of cone, showing the setaceous-like 

 bracts at its base and on the upper part of the pedicel. Natural size. Loc. Monckton Main Colliery, near 

 Barnsley, Yorkshire. Hor. Barnsley Thick Coal. Middle Coal Measures. Mr W. Hemingway, Collector. 

 Reg. No. 2260. P. 51. 



Fig. 3. Sigillariostrobus rhombibractiatus, n. sp. Portion of cone attached to its pedicel. Natural size. 

 Loc. Monckton Main Colliery, near Barnsley, Yorkshire. Hor. Barnsley Thick Coal. Middle Coal Measures. 

 Mr W. Hemingway, Collector. Reg. No. 2272. P. 51. 



Fig. 4. Sigillariostrobus rhombibractiatus, n. sp. Cone mostly denuded of bracts, and exhibiting their 

 spiral arrangement on the naked axis. Natural size. Loc. Monckton Main Colliery, near Barnsley, York- 

 shire. Hor, Barnsley Thick Coal. Middle Coal Measures. Mr W. Hemingway, Collector. Reg. No. 2259. 

 P. 52. 



4«. Portion of pedicel of fig. 4, immediately below cone, showing leaf-like bract and small tubercles 

 on pedicel ; slightly enlarged. 



Fig. 5. Sigillariostrobus rhombibractiatus, n. sp. Two cones attached to the same pedicel. Natural size. 

 Loc Monckton Main Colliery, near Barnsley, Yorkshire. Hor, Barnsley Thick Coal. Middle Coal Measures. 

 Mr W. Hemingway, Collector. Reg. No. 2271. P. 52. 



Fig. 6. Sigillariostrobus rhombibractiatus, n. sp. * Isolated bract. Natural size. Loc. Monckton Main 

 Colliery, near Barnsley, Yorkshire. Hor. Barnsley Thick Coal. Middle Coal Measures. Mr W. Hemingway, 

 Collector. Reg. No. 2262. P. 52. 



6a. Portion enlarged to show ciliated margin of bract. 



Fig. 7. Sigillariostrobus rhombibractiatus, n. sp. A bract. Natural size. Loc. Monckton Main 

 Colliery, near Barnsley, Yorkshire. Hor. Barnsley Thick Coal. Middle Coal Measures. Mr "W. Heming- 

 way, Collector. Reg. No. 2260. P. 52. 



la. Portion enlarged to show ciliated margin of bract. 



Fig. 8. Sigillariostrobus rhombibractiatus, n. sp. Portions of two cones attached to their pedicels. 

 Natural size. Loc. Monckton Main Colliery, near Barnsley, Yorkshire. Hor. Barnsley Thick Coal. 

 Middle Coal Measures. Mr W. Hemingway, Collector. Reg. No. 1272. P. 52. 



8a. Portion of pedicel enlarged to show small thorn-like hairs with which it is beset. 



Plate II. 



Fig. 1. Sigillariostrobus, sp. Portion of cone — a, a', a", a", sporangia, showing macrospores ; b, c, 

 sporangia ; d, sporangia seen laterally. Natural size. Loc. No. 3 Pit, Springhill, Crosshouse, Ayrshire. Hor. 

 Major Coal. Lower Coal Measures. Mr John Rourison, Collector. Reg. No. 1573. P. 49. 

 la. Macrosporangia, a on fig. 1, showing smooth macrospores, x 4. 

 laa. Macrospore, x 8. 

 1/'. Microsporangia (1), b in fig. 1, x 4. 



lc. Surface of 16 more highly magnified to show granular appearance of surface. 

 Id. Surface of 1/; still more highly magnified to show the cellular structure of the sporangium 

 wall, smaller than, and extending over, the granular surface of the sporangium. 



