450 PAL.EOBOTANY. 



abundant in the Coal-measures. The Cardiocarpa appear 

 mostly to have been winged achenes or " samaras ; '"' but it 

 is not altogether certain by what plants they were produced. 

 It is now known, however, that the so-called Antholitlics 

 consists of a spike, bearing Cardiocarpa protected by bracts ; 

 and there is a considerable probability that they were pro- 

 duced by Sigillarioid trees. Good 

 authorities, however, regard Cardio- 

 carpoii as really belonging to Cordaites. 

 Trigonocarpon (fig. 703) comprises 

 nut-like fruits, often of considerable 

 Ti'i.iQ-A.-TrigonoMrpon ova. sizc, and commouly three- or six- 

 tum coai-ineasures (After angled. The extcrior of the Iruit was 



LiiKlley and Hutton.) ~ 



probably fleshy, and well-preserved 

 specimens show the integuments, and the internal cavity at 

 one time filled by the albumen and emljryo. Trigonocarpon 

 is probably the fruit of a Conifer, and it shows a decided 

 resemblance to the solitary fruit of the existing Taxoid 

 genus Scdisburia. Possibly, however, i)r Dawson is correct 

 in his conjecture tliat 2nost of the Trigonocarpa belonged 

 really to Sigillarioid plants. 



