J 

 i 



IGO 



PROCEEDINaS OF THE QEOLOOICAL SOCIETY. 



stated, it had previously been well known elsewhere. I regard these % 

 plants, 80 well described by Williamson, as true Calamites, in tlie ". 

 sense in which that word is used above. 



(2) Thi> sjimo palieobotanist lias independently expressed the k- 

 lief above stated, that the leaves of Calamites are distinct from those 

 oi Axtcro/ihiiHites, i\m\ has also stated a distinction between those so- 

 called Volki)iiitnii<p which may be re}j:arded as frnits of Calimitu 

 and those wlijch belonjjjid to Aftftroph)//lifes *. He hiisalso dcscribeil 

 a specimen of !Sti(f))iari(( showinp; the medullary rays, iind othenvise 

 approaciiin}^ to the structures which should be found in the roots oi 

 the typical >Sl:/lllarl(r above described. I 



(;i) Schimpcr, in his ' j'alcontolo^ic Vegetale,' vol. xi.,has treatei 

 \\\ii S!</ill<(r'ui' very slij^'htly. He acMs no new lacts of importance to 

 their history, does not separate them from the jdunts of the genus 

 Lcpidophloio.'i, usually mixed with them, refers the whole to cue 

 genus, and places them with the Lycopodiaceic. 



(4) Biniiey, in the raheontographical Society's Publications, 

 vol. xxiv., has descri])ed, under the name of Bowmanites camhrem. 

 a very interesting!: plant, which 1 regard as a typic;il member of the 

 group AstcropJii/IHteiv, as distinguished from Calamitcii'. 



(•">) Attention haviiig been directed by Prof. Huxley to the pre- 

 senc'G oii spore-vKscs in Coal, I have endeavoured to show, in a paper 

 in the ' Ameiican Journal of Science ' for Ajjril, that these bodies are 

 "^^.^Jf^^S« constituent of ordinary Coal, and that any importance 

 which they possess in this respect is due to their identity in chemical 

 composition with those cortical and cpidennal tissues which, like the 

 siibenti of cork, are more nearly allied in composition to Coal than 

 any otlier recent vegetable matters, and better titted, by their che- 

 mical and mechanical properties, for its production. 



Wg- 



EXPLANATION OF THE PLATES. 



Pi-ate VIL 



Fig. 1. Sfen,hm,ia, pith „f Baduxi/hm; l"«, soction of one side, showing 

 uiapiirayms ; 1 /,, section of a diaphragm and throo wood-cells, 

 W walls ^' ^^^ wood-cells, highly niagnilied, showhig reticu- 



"■ ^'tisstT' f^^'?^ SiijUlaria, natural size; 2 a, 2b, diseigerous 

 nsHuo ni vesting the same. 



■ -SSint^.;' ^'^'''"'''^' "^'"^'^^ «'-: 3 a, discigerous and 

 J. ^^vrnhmjia, natural size ; 4 «, retieul. 



• ^'^^^^'^"form vessel of Lepidophloios. 



Fig. 7. Sfer>,hergia of T.ni a ^'''''"^ ^'"I- 



tissue ' ^°P'<l"d^>^droid tree?, natural size; 7 «, scalariform 



_ ^'^^^oii^^lll^'^Sf^^^^l^^^ 1 ^"ot in diameter, converted 



iiato-scalarifonn tissue. 

 scalariform and reticulato-scalari- 



Manehester Lit. and i^^C^^Zi;^^^^^;:,^;^-^^^!. 



