354 MR ROBERT KIDSTON ON THE FOSSIL PLANTS OF THE 



which has suffered little from pressure. At the parts indicated a\ a' 2 , a 3 branchlets are 

 given off. All of them spring from the stem at different angles, and almost appear as if 

 they followed a definite spiral arrangement, but one cannot speak of this point with 

 certainty. Another very interesting character exhibited by this specimen is the small 

 portion of the t: Sternhergia" cast of the pith cavity, which, being held in position by 

 the matrix, projects into the cavity once occupied by the stem. This is seen at 6. 

 The leaf cicatrices are also very clearly seen. In addition to the longitudinal striae 

 on the surface of the stem to which reference has already been made while describing the 

 other specimens, there are a number of elevated longitudinal ridges. These have prob- 

 ably been produced by shrinkage of the bark before mineralisation took place, which 

 now, of course, in the impression appear as ridges. 



Geinitz unites Carpolithes Cordai, Geinitz, with Cordaites principalis as its fruit ; 

 but this I think an error, for though Cordaites principalis is one of our commonest British 

 Lower and Middle Coal Measure fossils, I have not yet met with a single specimen of 

 Carpolithes Cordai in Britain.* On the other hand, one almost invariably finds the little 

 Cardiocarpus acutus, L. and H. (= Cordaianthus Pitcairnise, post p. 355), associated 

 with Cordaites principalis, — so much is this the case that I am strongly of opinion that 

 it is the fruit of Cordaites principalis, though their mere association is not sufficient 

 evidence for conclusively adopting this opinion. 



Locality. — Bonny ton Pit, Kilmarnock. 

 Horizon. — Shale over Whistler Coal. 



Locality. — Grange Colliery, Kilmarnock. 

 Horizon. — Shale over Stranger Coal. 



Locality. — No. 3 Pit, Springhill, Crosshouse. 

 Horizon. — Shale over Major Coal. 



Localities. — Irvine, &c. 



Artisia, Sternberg. 

 Artisia approximata, Brongt., sp. 



Artisia approximata, Corda in Sternb., Vers., ii. fasc. 7, 8, p. 205, pi. liii. figs. 1-6. 



Artisia approximata, Zeiller, Flore foss. d. bassin liouil. d. Valen., p. 634, pi. xciv. figs. 2, 3. 



Sternhergia approximata, Brongt., Prodrome, p. 137. 



Sternhergia approximata, L. and H., Fossil Flora, vol. iii. pis. cxxiv. cxxv. 



Artisia transversa, Presl. (not Artis) in Sternb., ibid., ii. p. 192, pi. liii. figs. 7-9. 



Artisia transversa, Roehl {not Artis), Foss. Flora d. Steink.-Form. Westph., p. 148, pi. iv. fig. 8. 



Artisia transversa, Roemer (not Artis), Letlixa geog., vol. i. p. 242, pi. Iv. fig. 3. 



Sternhergia transversa, Sauveur (not Artis), Veget. foss. d. terr. liouil. Belgique, pi. lxix. fig. 1. 



Sternhergia minor, Sauveur, ibid., pi. lxix. fig. 2. 



Note. — These fossils are the casts of the pith cavity of stems of Cordaites. 

 Locality. — Bonny ton Pit, Kilmarnock. 



* Since the above was written, I have seen a few specimens of Carpolithus Cordai from Yorkshire. 



