OF THE FOSSIL PLANTS OF THE COAL-MEASURES. 
469 
In my second memoir (Phil. Trans., 1872, p. 222), read in June, 1871, I said, “ I 
have little doubt but that Halonia was a fruit-bearing branch of a Lepidodendron;” 
and in a note added in April, 1872,'“ I affirmed absolutely, “First, that Halonia 
belongs to the upper branches of a Lepidodendroid tree, consequently it cannot be a 
root;” “Secondly, we learn that Halonia is a specialised branch of a Lepidodendroid 
tree that is not itself a Halonia.” These conclusions were further supported by 
Mr. Carruthers in his memoir on Halonia and Cyclostadia, already referred to as 
published in April, 1873, and in which the author, speaking of the specimen which he 
then described, says, “ With Bergeria must go Halonia as a separate genus, seeing 
that it is only a condition of Lepidophloios ; and it may be of other Lepidodendroid 
plants.” The specimen now described is unquestionably not a Lomatophloios but a 
true Lepidodendron. The figure on Plate 8 is slightly reduced in size. 
Sporocarpon. 
In my tenth memoir (Phil. Trans., 1880) I figured in Plate 18, fig. 39, and described 
(p. 510), under the name of Sporocarpon ornatum, a curious form of what appeared to 
be some Cryptogamic fruit. I have recently received two additional specimens of this 
organism, one from Mr. Earnshaw, of Oldham, and the other from Mr. Wild, of 
Ashton-under-Lyne, which, whilst they confirm my previously expressed conviction as 
to the character of this object, reveal some additional features connected with it. 
Mr. Wild’s specimen, originally a perfect circle, but slightly damaged during the 
preparation of the section, is represented by fig. 27. As before described, this fruit is 
a spherical body with an undulating peripheral outline. In both the new specimens 
the undulations are more regular than in that previously figured, and in the centre, a, 
of each crenulated prominence there is a canal produced by reabsorbtion of some of the 
parenchymatous cells. On re-examining my original specimen I find some slight traces 
of a similar condition. On the other hand, in both my two new examples the peri¬ 
pheral clusters of large cells ( loc. cit., fig. 39, d) are wanting. These circumstances 
suggest that the latter are examples of a more advanced stage of growth than the 
former. It is not improbable that this structure has been primarily developed in the 
interior of some parenchymatous tissue, of which the large cells, cl, of my original 
j figure are remnants, but which fell off after the capsule became separated from its 
temporary surroundings. 
jD adoxylon. 
In my memoir, Part VIII., I figured (loc. cit., Plate 8, figs. 44 and 46 ; Plate 9, 
figs. 47 and 48) and described (p. 230) some young branches of our British form of 
Dadoxylon in which vascular bundles are given off in pairs from the medullary border 
MDCCCLXXXIII. 
* Loc. cit., p. 225. 
3 P 
