336 CABDIOCAEPALES [CH. 



designation Cyclocarpon has been used for impressions affording 

 no information with regard to anatomical features. 



Cycadinocarpus. Renault^ 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^ 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* 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 apphed, by Schenk*, to fossil Dico- 

 tyledonous wood and was previously used by Boissier^. 



Samaropsis. Goeppert® 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'. 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- 

 hke 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* to Samaropsis the lateral appendages are probably true 



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



3 Kedler (57) p. 288, PI. xxvni. < Soheak (80) p. 660. 



"■ Ward (88) p. 802. 



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



' Ibid. fig. 19. 



» Heer (77) ii. PL xix. See also Nathorst (86) PI. xxv. figs. 10—14 



