Johnson — On Bothrodendron [Cyclostigma) Jdltorkense. 521 



ligulate Lycopod. (My drawing was obtained iu a way which I have 

 frequently found helpful in the study of fossil plant impressions. A photograph 

 was taken in this instance of the megaspore as magnified several diameters, 

 and projected on to the lantern screen. A piece of drawing paper was placed 

 on the wall-screen ; and the picture falling on it was traced, under criticism 

 from several of the more advanced students. The drawing was 21 x 9'5 em.) 



Fig. 5. — Diagrammatic restoration of megasporophyll of Bothrodendron HUorkense. 



Nothing of course of structural value was made out ; but the apical body as 

 seen was suggestive of a projecting prothallus. The sketcli was made some 

 two years ago, and seems to be an anticipatory confirmation, as far as an 

 impression can be, of McLean's interesting discovery made from his section 

 of a petrified sprouting megaspore, with a protruding apical prothallus. 



Fig. 6. — Megaspore of Bothrodendron kiltorlcense, apparently germinating and sliowing 

 projecting gametophyte. Magnified. 



Incidentally it may be noted that tlie presence of megaspores, 1 mm. in 

 diameter in the Upper Devonian, strengthens the view that the Pteridosperms 

 lived in the Devonian epoch. 



