XXX V] CYCADINOCARPUS 341 



described by Brongniart as Cardiocarpus tennis and Cyclocarpus 

 nummularis 1 . These types differ from Rhabdospermum in the 

 absence of an apical snout but agree with that genus in the steeply 

 descending course of the vascular strands in the basal region of the 

 seed. As stated on a previous page, the name Cydospermum 

 is proposed as a substitute for Cyclocarpus because of the employ- 

 ment of the latter term for impressions. 



Cycadinocarpus. Schimper 2 . 



Cycadinocarpus augustudunensis (Brongniart 3 ). In the posses- 

 sion of two sets of vascular bundles this type agrees with Cardio- 

 carpus, but the more internal strands pass up on the inner face 

 of the sclerotesta without penetrating into the nucellus, a feature 

 in which Cycadinocarpus agrees with the majority of recent cyca- 

 dean seeds : the outer bundles are given off from the main supply 

 after it has entered the sclerotesta and not before as in Cardio- 

 carpus ; they follow an oblique course in the sclerotesta and emerge 

 into the sarcotesta at the shoulders of the basal curve of the seed. 

 As in Cardiocarpus and Rhabdospermum the two outer bundles 

 lie in the principal plane of the seed. There is a pollen-chamber 

 at the apex of the nucellus and the latter tissue is prolonged as 

 a tent-pole which engages with the micropyle. In the absence 

 of data as to the course of the vascular bundles in the chalazal 

 region it would not be possible to distinguish between this genus 

 and Cardiocarpus. 



Rhabdocarpus Berger and Rhabdospermum gen. nov. 



It is proposed to restrict the name Rhabdocarpus* to impressions 

 and casts of seeds of the type represented by R. tunicatus as 

 figured by Berger 5 and reproduced in fig. 506, K, the term Rhabdo- 

 spermum being applied to seeds of similar form in which are shown 

 certain distinguishing anatomical features. Rhabdocarpus tuni- 

 catus Berger is a species founded on a specimen from the Coal 

 Measures of Silesia characterised by an outer carbonised testa 

 prolonged apically as a blunt snout and, as seen in fig. 506, K, 

 covering an apparently ribbed nucule, but the 'ribs' are due to 



1 Brongniart (81) Pis. iv. v. 2 Schimper (7$) A. p. 208, 



3 Brongniart (81) PI. in.; Bertrand, C. E. (08). 



4 pdpdos, a rod. 6 Berger (48) p. 20, PL i. fig. 8. 



