144 THE MEDALS OF CREATION. Cuap. VI. 
6. Megaphyton. — Stem dotted, neither furrowed nor 
branched, leaf-scars very large, of a horse-shoe figure.* 
7. Bothrodendron. — Stem pitted, neither furrowed nor 
branched, scars of cones (?) obliquely oval. 
8. Ulodendron.—Stem neither furrowed nor branched, 
covered with rhomboidal marks; scars of cones (?) circular. 
The characters of the roots called Stigmarie (ante, p. 134), 
and of the stems named Calamites (ante, p. 107), and Lqui- 
setites (ante, p. 106), are sufficiently distinct from the above 
to be easily recognized, I will briefly notice those not 
previously described. 
Lien. 41. STEMS FROM THE CoAL FORMATION. 
Fig. 1.—HALONIA REGULARIS. Coalbrook Dale. 
2.—Kwnorria Taxina. Roof of the High-main Coal seam, Jarrow 
Colliery. (Brit. Foss. Flor.) 
Halonia.—The specimens usually seen are mere sand- 
stone casts having a thin carbonaceous crust ; the stem is 
branched and beset with large elevated knobs, or subcor- 
tical protuberances, as shown in jig. 1, Lign. 41. These 
* Pictorial Atlas, pl. xxv. 
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