_Cordaispermum_. This designation was formerly adopted by Renault[913] for seeds having the form and anatomical features of _Cardiocarpus_ which there is good reason for attributing to _Cordaites_ or to some allied genus. In view of the fact that the majority of the seeds under consideration are undoubtedly Cordaitean there is no need to employ this additional generic name. _Cyclocarpon_. Fiedler[914] instituted this term for seeds previously described by Berger as _Cardiocarpon emarginatum_ (fig. 502, B, now included in _Samaropsis_) and added a new species _Cyclocarpon nummularium_. Brongniart[915] subsequently described the structure of two species, _C. tenue_ and _C. nummulare_, which he referred to Fiedler’s genus, and Bertrand[916] has shown that these differ from the genus _Cardiocarpus_ in the recurrent course of the bundles given off from the chalazal strand as in the genus _Rhabdospermum_ (cf. fig. 501, E). There are no good grounds for retaining the designation _Cyclocarpon_ for casts and impressions, as the specimens so named are indistinguishable from impressions referred to _Cordaicarpus_. The generic name _Cyclocarpus_, retained by Bertrand only for _C. tenuis_ and _C. nummularis_ simply for anatomical reasons, is now altered to _Cyclospermum_ on the ground that the designation _Cyclocarpon_ has been used for impressions affording no information with regard to anatomical features. _Cycadinocarpus_. Renault[917] transferred to this genus Brongniart’s species _Cardiocarpus augustodunensis_ on the ground that the vascular system exhibits in a greater degree than the other types included by Brongniart in _Cardiocarpus_ a resemblance to that in recent cycadean seeds. Bertrand[918] confirms Renault’s account and retains _Cycadinocarpus augustodunensis_ as a species worthy of generic distinction. A short account of this seed is given on a later page. _Jordania_. This name was given by Fiedler[919] to compressed ovate-cordate seeds characterised by a broad membranous border bearing a superficial resemblance to the seeds of _Bignonia_. The type-species, _J. bignoniodes_ (fig. 502, I), from the Coal Measures of Saarbrücken has the form usually associated with the designation _Samaropsis_, and as the latter term is generally adopted there are no adequate reasons for the retention of _Jordania_. The name _Jordania_ has also been applied, by Schenk[920], to fossil Dicotyledonous wood and was previously used by Boissier[921]. [Illustration: Fig. 499. _Samaropsis emarginata_, from the Westphalian series, Yorkshire. (Kidston Coll., 4227; × 2.)]