Ajfiiiitics of the Gtauti rotliocites. 37 



EXPLANATION OF THE PLATES. 

 Plate I. 



Fig. L Fruit of Bornia radiata, Brongn. (Potkocites Orantonii, 

 I'atcrson), The fruit shows two perfect segments and 

 a iiortion of a third. Each segment has several longitu- 

 dinal ridges bearing sporangia which have opened. (Nat. 

 size.) From the Calciferous Sandstone series, shore, at 

 Granton. 



Fig. 2. Portion of the uppermost segment of the same specimen, 

 showing the arrangement of the sporangia. (Magnified.) 



Fig. 3. An open sporangium composed of five rays, from the same 

 specimen, (Magnified.) 



Fig. 4. Another sporangium, with four rays. (Magnified.) 



Fig. 5. Diagrammatic section (at right angles to the surface) of 

 one of the rays on Pothocitcs G^rantonii, Pat., showing 

 that the apparent " harder " to the rays is caused by an 

 upward turning of their margins. 



Plate 1 1. 



Fig. 6. Fruit of Bornia radiata, Brongn. {Pothocites Patersoni, 

 Eth.), showing the fruit attached to a calamitic stem. 

 The spike shows three segments and a portion of a 

 fourth. From the Calciferous Sandstone series, Raeburn's 

 Pit, near West Calder. 



Fig. 7. Impression of the same specimen, which shows more 

 distinctly the transverse bars on the segments of the 

 fruit. This example is imperfect, as indicated by a small 

 portion of the axis extending beyond the uppermost 

 segment preserved in the fossil. 



Fig. 8. Fruit of Bornia radiata, Brongn., showing two spikes 

 terminating the extremities of a dichotomous branch. 

 From the Calciferous Sandstone series, Barnton Pavement- 

 stone Quarry, Corstorphine Hdl, near Edinburgh. 



Plate IIL 



Fig. 9. Fruit of Bornia radiata, Brongn. (Pothocites Patersoni, 

 Eth.), showing the lowest segment. The fruit is attached 

 to a stem composed of swollen nodes and internodes. 

 The fruit-bearing branch springs from another similar but 

 slightly stouter stem. (Nat. size.) From the Calciferous 

 Sandstone series. Fell's Pit, near West Calder. 



Fig. 10. The impression of the last specimen, (Nat, size.) 



Fig. 11. Sphe)iophi/Uu77i tenen'iminn (Ett. ]\IS.), Stur. From the 

 Calciferous Sandstone series, Raw Camps, East Calder. 



Fig. 12. The same. From the Calciferous Sandstone series, 

 Burdiehouse. (In the Hugh Miller collection. Museum 

 of Science and Art, Edinburgh. iMy thanks are due to 

 Profpssnr Archer for pr-rmission to fignro tliis specimen.) 



