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592 R. KIDSTON ON THE FRUCTIFICATION 
ZEILLERIA DELICATULA, Sternb., sp. 
Sphenopteris delicatula, Sternb. Versuch, 1. fase. 2, p. 30, pl. xxvi- 
fig. 5, fase. 4, p. xvi.; Brongt. Prodrome, p. 50. 
Sphenopteris meifolia, Sternb. Versuch, ii. p. 56, pl. xx. £. 5; 
Unger, Syn. Plant. Foss. p. 61; id. Genera et Species, p. 112; 
Giebel, Deutschl. Petrefacten, p. 40; Schimper, Traité de Paléont. 
Végeét. vol.i. p. 383; Stur, Jahrb. d. k.-k. geol. Reichsanstalt, vol. xii. 
p. 143, 1861-62. Feistmantel, Steinkohl. u. Perm-Ablager- p. 74. 
Cheilanthites merfolius, Gopp. Syst. Fil. Foss. p. 241; var. trifidus, 
Goépp. Syst. Fil. Foss. p. 241, pl. xv. f. 3,4; ? Ettingsh. Steinkoh- 
lenflora von Radnitz, p. 36, f. 3. pl. xviii. 
Description.—Frond tripinnate, pimne alternate, pinnules oppo- 
site or alternate. Barren pinnules deeply divided into 3-6 narrow 
segments with retuse apices, each segment having a single vein. 
Segments of fertile pinnules slightly produced to form a pedicel, 
on which the involucres are borne. Involucres globular in the early 
state, but split up into four valves towards maturity. 
Rachis flexuous and slightly winged. 
Remarks.—Two tolerably perfect primary (?) pinne are shown 
in Pl. XXV. fig. 1; from the position they hold to each other, they 
in all likelihood spring from a common rachis. At several points 
of this specimen indications of the fruit are shown; but the in- 
volucres have been removed, and the point to which they were 
attached is only indicated by a small dark spot. 
The ordinary form of the barren frond undergoes but little 
alteration in the fertile condition. 
The fertile segments of the pinnules become slightly elongated, to 
. form, as it were, a little pedicel for the involucres, as seen in 
Pl; XX. figs. 253, 6:06, (PSO lee 
The young state of the fruit is shown in Pl. XXYV. fig. 2, where it 
appears as a little globular involucre placed upon a short stalk. 
Several of the pinnules in this figure are barren; thus it shows one 
of the generic differences between Zeilleria and Calymmatotheca, 
as the last-mentioned genus is restricted in this communication. _ 
The same character is seen in figs. 3, 6, 7 of the same Plate. 
Figures 3 & 9, Pl. XXV., show the form which has been distin- 
guished as Cheilanthites meifolius, var. trifidus, Gopp. 
In fig. 3 many of the segments of the pinnules are produced in 
a setaceous manner. These were probably soriferous, as the 
involucres shown in Pl. XXV. figs. 2,6, 7, 8, 10,11, & 12 are sup- 
ported on stalk-like pedicels. 
The involucres, split into four valves, are shown in Pl. XXV. 
figs.5,5 a, 6, 7,12, 12a. Generally, only three valves are visible ; 
but one capsule, which has been split and flattened out, shows 
distinctly the four segments (fig. 5a). This figure is an enlarged 
view of an involucre on the small slab, fig. 5. 
The barren pinnules consist of a narrow border of delicate tissue 
on each side of the midrib ; but it is only in well-preserved specimens 
