336 CARDIOCARPALES [CH. 



designation Cydocarpon has been used for impressions affording 

 no information with regard to anatomical features. 



Cycadinocarpus. Renault 1 transferred to this genus Brong- 

 niart'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 2 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 3 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 Saarbriicken has the form usually associated with the designa- 

 tion 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 4 , to fossil Dico- 

 tyledonous wood and was previously used by Boissier 5 . 



Samaropsis. Goeppert 6 defined Samaropsis as 'Fructus 

 samaroideus membranaceus, compressus, margine alatus, mono- 

 spermus.' The type-species, S. ulmiformis, from the Permian of 

 Brenau, is a small seed with a broad wing or border, but a better 

 example of Samaropsis is figured by Goeppert as the wing of an 

 insect 7 . Examples of the genus are shown in figs. 502, A H ; 

 503 ; 504). Seeds included in Samaropsis differ from those 

 referred to Cordaicarpus in the presence of a broader and more 

 clearly defined border which in some cases, as in the genus Mitro- 

 spermum (fig. 494, K, L), undoubtedly represents a lateral wing- 

 like extension of the sarcotesta. In some instances the wing may 

 be a tangentially expanded integument comparable with the 

 perianth of Welwitschia, and in some Jurassic seeds referred by 

 Heer 8 to Samaropsis the lateral appendages are probably true 



Renault (96) A. p. 385. 2 Bertrand, C. E. (08). 



Fiedler (57) p. 288, PI. xxvm. 4 Schenk (80) p. 660. 



Ward (88) p. 802. 



Goeppert (65) p. 177, PL xxvm. figs. 10, 11. 



Ibid. fig. 19. 



Heer (77) ii. PL xix. See also Nathorst (86) PL xxv. figs. 1014. 



