526 Palaeontologie. 



seulement, abstraction faite des iormes qui vivent encore dans 

 la region, avec indication de leur repartition dans les divers 

 depöts actuellement connus, au nombre de quinze pour le 

 Puy-de-Döme et de cinq pour le Cantal. R. Zeiller. 



Scott, D. H., On theStructure andAffinities of Fossil 

 Plauts from the Paiaeozoic Rocks. IV. The Seed- 

 like Fructification of Lepldocarpon, a Genus of 

 Lycopodiaceous Cones from the Carboniferous 

 Formation. (Phil. Trans. Roy. Sog. Lond. Vol. CXCIV. 

 1901. p. 291.) 

 In this memoir the author gives a fully illustrated account 

 •of the fossil remains of the genus Lepldocarpon. Two species 

 {L. Lomaxi and L. Wildianiim) are distinguished, both of 

 which were included in Cardiocarpon annomahim, Well. 

 L. Lomaxi is known in the form of nearly perfect cones, as 

 well as of detached sporophylls, from the Lower Coal-measures. 

 The largest cone had a diameter of 3 cm. and was at least 

 1^/2 inches long. In the arrangement and structure of the 

 sporophylls, the position of the ligule, and the anatomy of the 

 axis Lepldocarpon agrees with Lepldostrobns. Fach sporophyll 

 had a long horizontal pedicel, expanding distally into the 

 lamina, the point of which was directed vertically. The elongated 

 sporangium is attached along the upper face of the pedicel, its 

 base t)eing sunk in a groove of the latter. The sporangium 

 tapers to a sharp ridge along the top; its wall is composed 

 of a columnar layer of thick-walled cells within which is a 

 thin-walled tissue. A single large megaspore was developed 

 in each sporangium; remains of three smaller arrested spores 

 frequently accompany this. This structure, which is essentially 

 that of a Lepldostrobns with a single megaspore in each 

 sporangium, was found throughout the smaller cones and 

 in the upper region of the oldest cone. In the lower sporophylls 

 of the latter and in isolated sporophylls the sporangium was 

 surrounded by an integument, consisting of dense fibrous tissue, 

 which only left a narrow slit-like opening above. The integument 

 was present at the sides and at the proximal extremety, but 

 was completed at the distal end by the up-turned lamina. 

 Along the greater part of the pedicel its insertion was approxi- 

 mately marginal, but towards the distal extremity the margin 

 of the sporophyll projected beyond the base of the integument, 

 which thus Springs from the upper surface. No indication of 

 a pollen Chamber was present in the projecting ridge of the 

 sporangium. In one case the megaspore contained a thin walled 

 prothallus; no sexual organs were seen. A small Lepidostroboid 

 cone associated with L. Lomaxi had an integument around each 

 of the microsporangia and is regarded by the author as 

 probably the male cone of this species. The integument only 

 extended about half-way up the microsporangia and was wanting 

 at the proximal end. The structure of L. Wlldlamim, which is 



