LYGINODENDRON 395 



probability of the Splienopteris type. 1 The character 

 of the seed itself suggests the presence of a " canopy." 



In Splienopteris 

 Dubuissonis, a Lower 

 Coal - measure species 

 from Brittany allied to 

 J>. Hbningliausi, M. 

 Grand'Eury has ob- 

 served six-lobed cupules, 

 in some cases still con- 

 taining the seeds, situated 

 at the extremity of long, 

 slender pedicels, identi- 

 cal with the ultimate 

 ramifications of the 

 rachis. 2 



The specimens de- 

 scribed by Stur, Arber, 

 and Grand'Eury are all 

 preserved in the form 

 of impressions ; they 

 supplement, in a most satisfactory manner, the evidence 

 of the structural specimens, and leave no doubt that 

 the seeds of the Lyginodendron group were borne on 

 the rachis of the frond. The analogy of the pollen- 

 bearing organs, next to be described, establishes a 

 presumption that the fertile rachis formed part of the 

 same frond which elsewhere bore vegetative leaflets. 



The well-known seed Lagenostoma ovoides, of which 



1 Arber, "Some New Species of Lagenostoma, a Type of Pteridospermous 

 Seed," Prof. Roy. Sec. (B) vol. Ixxvi. 1905. 



2 Grand'Eury, " Sur les Graines de Splienopteris," etc., Comptcs Kendus 

 t. 141, p. 812, 1905. 



151. — Lagenostoma Sinclair!. Two seeds, 

 enclosed in lobed cupules, and borne termin- 

 ally on branches of the rachis. x 5. After 

 Arber. 



