CALAMODENDRON. 



29 



in the matrix. Some of these leaves measure nearly an inch and a half in length, and 

 are marked with a keel. Altogether, in form and character (except being a little less in 

 size), those leaves bear great resemblance to Lepidophijllim. 



In PI. VI, fig. 4 (No. 15), is another specimen from Ardwick (magnified twice 

 its natural size), having a stem of about two inches in length, and not so stout 

 as the two last described, but more deeply furrowed and more sharply ribbed. At 

 each of the joints of the stem (two of which are visible) are seen four fruit-cones, accom- 

 panied by as many leaves of Aster opliylUtes longifolia, springing outwards ; and probably 

 as many more may be concealed in the matrix underneath. 



The cones consist of a central axis, on either side of which, exactly opposite each other, 

 are seen seven or eight pairs of cordate bodies, each having a division in its middle. This 

 organ somewhat resembles the bladder-shaped bag or envelope, containing sporangia, 

 described by Ludwig (see above, p. 24). They are bounded by a scale or disc, coming 

 at first from the axis nearly at right angles, but afterwards running almost parallel to it, and 

 forming the receptacle or sporangium-cases. 



In three of these cones is the termination of the scales ; and there are six cones seen, 

 probably as many more lying underneath in the shale : thus it is probable that each 

 receptacle had six bags, containing four sporangia each : or altogether twenty-four, 

 as in the specimens showing structure previously described (p. 24). The thorn or 

 spindle, around which the sporangia are fixed, is not well shown unless we take the dark 

 line of division of the sporangium-case to be it. The whole of the specimen so far as the 

 cone is concerned, in its external characters, resembles my other specimens of the 

 fructification of Calamodendron coiirmune rather than Ludwig's specimens ; and it is 

 found, we must remember, not only with the leaves of Asfero2)IiyUites, connected with 

 the stem on which it grew, but surrounded by an abundance of detached leaves and 

 stems of that plant. 



PL VI, fig. 4 a (No. 16), represents the apex of a cone, from Ardwick, magnified 

 three diameters ; and shows six leaves or scales on the side of the specimen which is 

 exposed to view. 



