tLATE III. 



Ceossotheoa Honinghausi, Kidston. 

 (Lyginodendeon oldhamidm, Williamson.) 



Fig. 



1. Part of Plate II., fig. 6, c 1, c 2, c 3, to show the venation. Magnified. 



2. Calymmatotheca condition, in continuity with the raeliis r of Lygino- 



denclron. The seed o is shown attached to the naked raehis branch, 

 surrounded at its tip by cupular lobes. The proximal end of the 

 seed only was at first observable, and the convexity was broken across 

 at a. By dissection under the microscope the distal end was laid bare 

 and the elliptic shape recognized, c and d are two grooves on opposite 

 sides of the seed. The surface of the proximal end of the seed has a 

 glazed appearance, due to the deposit of iron pyrites, observable 

 elsewhere also in the specimen. The regions a and h are well 

 carbonized, and suggest the testa. At b especially the testa seems 

 clearly distinguishable. 



3. The seed and its cupular lobes. Magnified. 



4. A cupular rosette. Magnified, r, raehis, c, e, cupular lobes, s, seed ? 



Venation shown. 



5. A pinnule, showing commencing fertility. Two of the segments of 



the pinnule are converted into ligulate cupule-like lobes, /. P 

 represents the points of insertion of other pinnules, d the normal 

 point of insertion of a pinnule. The raehis in the specimen is 

 naked here, thus giving another sign of the beginning ofconversion 

 into a fertile state. Magnified. 



6. Diagrammatic representation of sterile (a), male {b), and female (c) 



pinnules for comparison of homologies. The lobed sterile segments of 

 the pinnule a are converted into the fertile male segments of the 

 branch [b], each with its group of pendulous bilocular pollen sacs or 

 microsporangia, and into the fertile female segments of the branch (c), 

 each with its single seed enclosed by five or six cupular lobes. 



