AND FOLIAGE OF CALAMODENDRON COMMUNE. 219 



lished; my opinion was that the only point in which the 

 specimen differed from Goeppert^s was that the cones in it 

 only possessed eight or nine receptacles^ whilst the Pro- 

 fessor^s had fifteen or sixteen. The resemblance of the 

 specimen to Dr. Ludwig's larger one, figured and described 

 by that author in Dunker and von Meyer's ^Palaeonto- 

 graphica/ vol. x. 1861 to 1863, was also noticed, and its 

 difference in the number of receptacles for containing 

 sporangia pointed out. 



Since the publication of the monograph, Captain Aitken, 

 of Irwell Vale, and Mr. John Aitken have been so good 

 as to conduct me to the place where the specimens were 

 found, and I have collected myself far more perfect and 

 complete specimens than those which had previously come 

 under my observation. 



In both Goeppert and Ludwig's specimens the cones or 

 spikes, like the leaves, were arranged in whorls at each 

 node of the fruit-stalk. The same arrangement was ob- 

 served by me in the first specimen from Ewood Bridge 

 which came under my observation. Now, although that 

 undoubtedly appears to have been the more common form 

 of attachment of the cones to the fruit-stalk, there is clear 

 evidence that some of these organs occurred at the extre- 

 mity of the branches, as seen in the fructification of the 

 common Equisetum ; or it may more probably have been 

 that the two forms of fructification were united in one 

 fruit-stalk and formed a terminal panicle. Up to the 

 present time, however, the two forms have not been found 

 absolutely joined together. 



Fig. I. Plate VI. represents a branchlet (natural size) of 

 the Ewood-Bridge plant, of which Mr. John Aitken has 

 kindly allowed me the loan. From a stem, which is 

 slightly ribbed and furrowed, are seen to proceed, at its 

 nodes, thirteen whorls of verticillate leaves, which take a 

 suberect direction. Each leaf was composed of from six- 



