PALEOZOIC TIME — CARBONIC. 



671 



are represented in Figs. 1045 to 1052. The genus Neuropteris (Figs. 1049, 

 1050) is one of the most abundant in species. The basal leaves (Figs. 1050, 

 1052) vary widely in form in the same species, and are sometimes delicately 

 fimbriated. Odontopteris (Fig. 1045) has man}^ species ; and so also Aletlwp- 

 teris (Fig. 1046), Spnenopteris (Figs. 1047, 1048), and Pecopderis (Fig. 1051). 



1049-105fi. 



Feens. — Figs. 1049, 1049 a, Neuropteris LoscUi, parts of the same leaflet; 1050, Neuropteris hirsuta ; 1051, 

 Pecopteris arborescens ; 10.51 a, a portion of the same, enlarged ; 1052, basal leaf of Neuropteris tenulfolia. 

 Eqfiseta. — 1053, AsterophyUites equisetiformis ; 1053 a, the same (?) with sporangia at the axils of the 

 leaves ; 1054, A. sublievis ; 1055, Calamites cannseformis ; 10.55 a, surface-markings of same, enlarged. — Fig. 

 1056, Sphenophjilum Schlotheimi. Figs. 1049-1054, 1056, Lesquereux ; 1055, Brongniart. 



Eguiseta. — The more common Equiseta of the Coal-measures are 

 species of Calamites, as in the Devonian. One of the jointed, delicately 

 fluted stems is represented in Fig. 1055 ; and the junction of the flutings of 

 the surface at a joint, in Fig. 1055 a. The Asteropliyllites (Fig. 1053) and An- 

 nularice are sometimes branches of the same plant, the former occurring toward 

 its base. Fig. 1053 a shows the sporangia at the base of the leaves. 



Fig. 1056 represents a common species of SpJienophyUum ; the name 

 alludes to the wedge-shaped leaves ; W. C. Williamson states (1894) that the 



