132 TRAXSACTIOXS, NATURAL HISTORY SOCIETY OP GLASGOW. 



here, I am afraid, the matter must rest for the present. To 

 repeat the arguments which led to the above conclusions is 

 unnecessary, as the original memoirs are most accessible to all 

 students.' 



Genera of Uncertain Position. 



I. Cheirostrobus, Scott, 1897. 



1897. Cheirostrobus, Scott. Froc. Roy. Soc. London, Vol. LX., 

 p. 422. 



1897. Cheirostrobus, Scott. On Cheirostrobus, a new type of 

 Fossil Cone from the Lower Carboniferous Strata 

 (Calciferous Sandstone Series), Phil. Trans., Vol. 

 CLXXXIX., Series B, pp. 1-34, Pis. I.-VI. 



The single species of this genus, Cheirostrobus Pettycurensis, 

 Scott, is founded on a portion of a peduncle and a cone, the only 

 two specimens of the plant known to exist. 



The cone represents a very complex structure, and any short 

 description which could be included here, unless very fully 

 illustrated, would be of little practical utility. 



In regard to the affinities of C heriostrobus Dr. Scott says : — 

 " Taking all the characters collectively, it seems clear that 

 Cheirostrobibs has more in common with Sphenophyllum than 

 with any other known group, recent or fossil, and that Spheno- 

 phyllum is thus no longer left perfectly isolated in the vegetable 

 kingdom. " " 



I scarcelj' feel inclined to place Cheirostrobus in the 

 Sjihenophyllales ; the differences are such that it appears to me 

 to demand a position equal in value to Sphenophyllum itself, and 

 that it is really the type of a distinct group. 



The cone was discovered by Mr. James Bennie. Edinburgh, at 

 Pettycui', Fife, and the peduncle fi'om the same locality is in the 

 Williamson Collection, British Museum. 



1 See also Potonie, Ueher die Stelliinrj dcr Sphtnophyllaceen im System, 

 Bericht d. Deut. Bot. GeselL, Vol. XII., Heft. 4, 1894, p. 97. Potonie, 

 Lthrb. d. Pflanzenpalcnontologie, 1899, p. ISO. 



-Scott, Phil. Tram., Vol. CLXXXIX., p. 25. 1897. 



