62 
Arber —On a Neiv Pteri do sperm. 
Lomaxi , Will., L. Kidstoni , Arber, and L. Sine lair i, Kidst. MS., as to 
the habit of the fertile fronds, receives strong confirmation if from an 
indirect source. That the Lyginodendreae, in common with all the other 
known members of the class Pteridospermeae, were characterized by an 
absence of any aggregation of either the male or female organs into cones 
or stroboli, is a fact of great importance, in view of the strobilate descendants 
which were probably derived from them in Mesozoic times. 
Bibliography. 
Arber, E. A. N. (’05 1 ) : On some New Species of Lagenostoma, a type of Pteridospermous Seed 
from the Coal Measures. Proc. Roy. Soc. London, vol. B. 76, p. 245, 1905. 
(’05 2 ) : The seed-bearing habit in the Lyginodendreae. Proc. Cambr. Phil. Soc., 
vol. xiii, pt. iii, p. 158, 1905. 
(’06) : On the Past History of the Ferns. Ann. of Bot., vol. xx, p. 215, 1906. 
Kidston, R. (’84) : On the Fructification of Zeilleria ( Sphenopteris ) delicatula , Sternb. sp., &c. 
Quart. Journ. Geol. Soc., vol. xl, p. 590, 1884. 
: (’06) : On the Microsporangia of the Pteridospermeae, with remarks on their relation- 
ship to Existing Groups. Phil. Trans. Roy. Soc., Ser. B, vol. 198, p. 413, 1906. 
Oliver, F. W. (’05) : Uber die neuentdeckten Samen der Steinkohlenfarne. Biolog. Centralbl., 
vol. xxv, p. 401, 1905. 
Oliver, F. W. and Scott, D. H. (’04) : On the Structure of the Palaeozoic Seed Lagenostoma 
Lomaxi , with a statement of the evidence upon which it is referred to Lyginodendron. Phil. 
Trans. Roy. Soc., vol. 197 B, p. 193, 1904. 
Stur, D. (77) : Die Culm-Flora. II. Die Culm-Flora der Ostrauer und Waldenburger Schichten. 
Abhandl. K. K. Geol. Reichsanst. Wien, vol. viii, pt. ii, 1877. 
(’88): Die Carbon-Flora der Schatzlarer Schichten. Abth. I. : Die Fame. Abhandl. 
K. K. Geol. Reichsanst. Wien, vol. xi, 1885. 
EXPLANATION OF PLATE VI. 
Illustrating Mr. Arber’s paper on Carpolithus Nathorsti, sp. nova. 
(Drawings by Miss G. M. Woodward.) 
Fig. 1. Impression of 3 pinnae of a Sphenopteris frond, bearing a large number of seeds, many 
still in continuity, x 3. 
Fig. 2. Detached seed, x 20. 
Dig. 3. Seed attached to a lobe which has become broken away from the rest of the pinnule, 
x 20. 
Fig. 4. Pinnule showing several seeds in continuity, probably still enclosed in their cupules. 
x 7- 
Fig. 5. Seeds apparently enclosed in cupules, and in continuity with lobes of the pinnules, 
x 7. 
Fig. 6. Seeds apparently enclosed in cupules. x 10. 
Fig. 7. Two seeds, probably still enclosed in their cupules, borne on the lobes of a pinnule, 
x 10. 
Fig. 8. Seeds apparently enclosed in cupules and borne at the ends of the linear lobes of pinnules. 
x 8. 
