KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 51. N:o 3. 9 
Dictyozamites cf. falcatus (Morr.) OLDH. 
Pl. 5, figs. 29—33. 
Cf. Dictyopteris falcata Morris, OLDHAM & Morris 1863, p. 38; pl. 24, figs. 1, 1a. 
Cf. Dictyozamites, OLDHAM, ibidem, p. 40. 
Cf. Dictyozamites indicus FEISTMANTEL; 1877, p. 18; pl. 4, figs. SsoPpliu5tfgs II ==4pli6; 
1877 ad, Pp. 70; pl. 46, figs. 7, 8; — TL8T0, på LS: pl 2; Hg. 5, 6; 1879, -p. 24; pls. 3—5. 
Dictyozamites (cfr. falcatus), HALLE 1912, p. 40. 
bu | 
The commonest and best preserved plant-remains in the fossiliferous series at 
Bahia Tekenika, are some fragments of fronds of a cycadophyte belonging to the 
genus Dictyozamites. In a short note in the »Palzreobotanische Zeitschrift» (1912) I 
have already reported the occurrence of the genus in this locality, the only one at 
present known in South America or, indeed, anywhere in the Southern and Western 
Hemispheres. A definite specific determination of the fossil is not possible, but the 
greatest resemblance is to the Indian species, D. falcatus (MORR.) OLDH. 
The material is very fragmentary, and the preservation rather unsatisfactory, 
yet the generic determination appears safe. Only one specimen (pl. 5, fig. 33) shows 
the pinnae still attached to the rachis; with this exception only isolated pinnae 
occur. In the former specimen the preservation is particularly unsatisfactory, the 
venation being quite invisible. It is probable, however, that it belongs to this genus, 
because the pinnae are very like those with better preserved venation which occur 
detached in the rock. The pinnae also have the shape characteristic of Dictyozamites, 
being slightly falcate and apparently auriculate at the base. The detached pinnae, 
of which two are shown in pl. 5, figs. 29 and 31, are also somewhat falcate, but are 
a little longer than those of the completer specimen. "They have no midrib, but the 
median zone is occupied by a number of subparallel longitudinal veins. On both sides 
of this median zone the veins are more spreading, arching towards the margins. A 
close examination in a favourable light reveals the occurrence of anastomoses (pl. 5, 
figs. 30 and 32). 
There can be no doubt that these fragments, poor though they are, indicate 
the presence of the genus Dictyozamites at Tekenika. Dictyozamites OLDH. was first 
described from the Rajmahal Group of the Upper Gondwanas of India. FEISTMANTEL, 
who revived ÖLDHAM”S genus and redescribed the species known as Dictyopteris fal- 
cata MORRIS under the name of Dictyozamites indicus (FEISTMANTEL, 1. c.), regarded 
the genus as exclusively characteristic of the Gondwana facies. Later on, the genus 
was recorded by YOKOYAMA (1886, p. 7) from the Middle Jurassic of Japan, the 
Japanese species being later (1889) described by him as D. indicus FERISTM. var. 
distans YoK. and D. grossinervis YorK. That the distribution of the genus extended 
to Europe was proved in 1889 by NATHORST, who described a new species, D. 
Johnstrupi, from the island of Bornholm, where it occurred in beds considered to 
be of Liassic age. Finally a new species, Dictyozamites Hawelli SEw., has been de- 
seribed by SEWARD (1903 a) from the Lower Oolite of Yorkshire. 
E. Sv. Vet. Akad. Handl. Band. 51. N:o 3. 2 
