24 Mr. R. Kidslon on the 



fruiting pinnule, one half of each pinnule having apparently 

 adhered to each side of the matrix when the stone was split. 

 Thus there is only one half of the disk with its surrounding 

 fringe of sporangia shown respectively on the fossils and their 

 counterparts. 



Figs. 4 and 5 represent each two fruiting pinnules, mag- 

 nified six and a half times. These figures are drawn under 

 the microscope with the camera lucida, and every endeavour 

 has been taken to avoid any " restoration ; " so that those who 

 cannot see the originals may form their own conclusions from 

 the drawings. 



Fig. 4 is an enlargement of the two fruiting pinnules marked 

 a in fig. 1. Both these pinnules, as already mentioned, are 

 split through the middle, so that only half the disk and its 

 fringe of sporangia are shown. The sporangia appear to have 

 depended almost at right angles from the margin of the 

 supporting disk. In no case did I see any trace of a thickened 

 vein in the disk-like portion of the pinnule like that figured 

 and described by Zeiller (see fig. 9). 



Owing to the fruiting pinnules being split in two — and this 

 arises evidently from the comparatively thick mass of coaly 

 matter into which they have been converted — the pinnules 

 have the appearance of being attached to the pedicels by their 

 centre, within the fringe of sporangia ; but in reality I believe 

 the pedicels are attached to the outside edge of the fruiting 

 pinnules, like a leaf to its stalk, and that the pedicel is bent 

 into a knee, which causes the pinnule to assume a horizontal 

 position. The apparent 'peltate attachment of the fruiting 

 pinnules to the pedicels is therefore probably caused by the 

 pinnule lying upon the pedicel and concealing the upper part 

 of it. 



Fig. 5 exhibits very much the same characters as fig. 4. 



Fig. 6 shows four sporangia, enlarged eighteen times. 

 The form of the sporangia is better shown here than in the 

 previous figures. This figure is part of the fruiting pinnule 

 marked h in fig. 1. The sporangia are linear and apparently 

 blunt-pointed, as shown by that to the left ; the other three 

 are probably broken over at their apices. They all show, 

 especially those to the left, an apparent basal contraction 

 which ends in a short pedicel. The sporangia are clearly 

 united to each other and only free at the apex. For the pur- 

 pose of comparison I have given a copy of a fruiting pinnule 

 of Crossotheca Crejn'ni, as figured by Zeiller (fig. 9). 



The barren pinnules of Crossotheca fimhviata are of very 

 delicate texture, and though they frequently occur on the 

 same slabs as the i'ruiting specimens they are seldom well 



