281 



In the annexed figure, which represents a small 

 portion of the two membranes highly magnified, 

 the marginal vein of the lobe is supposed to be 

 presented to view edgeways at e, the capsules 

 having been removed in order to leave the view 

 of the membranes unobstructed ; f represents 

 the superior membrane or bleached free edge of 

 the superior epidermis, and g the inferior mem- 

 brane or supposed involucre. 



Type of the Genus, Eupteris aquilina 

 Pteris aquilina of all other authors. 



Fig. 12, Fimbriate membranes 



Allosorus aquilinus, Presl. 

 Edward Newman. 



9, Devonshire Street, City, 

 July 24, 1845. 



(To be continued). 



Remarks on Structural Botany. By William Wilson, Esq. 

 (Continued from page 229). 



In the published part of the present paper (see Phytol. ii. p. 229), 

 instead of defining Raphe as an ^^ adherent funiculus^'' \V "^ovXdihe 

 better to substitute the following : — " a funiculus adhering laterally 

 throughout its whole length to the ovule." 



It follows from this view of the subject, that the term chalaza is 

 wholly unnecessary, and should therefore be discarded. 



In connexion with this topic it may be proper to obviate some con- 

 fusion which has crept into the definition of an ovule &c. 



In Lindley's Introduction, p. 1 79, the ovule is said to be " inclosed 

 in two sacs or integuments :" it is much more correct to say that it 

 consists of two sacs inclosing a nucleus. (See Lindley's Key, No. 

 398, p. 30). 



In Lindley's Introduction (p. 218), the term orthotropal is used to 

 express a certain position of the embryo, which is at variance with 

 the definition at p. 417, where orthotropal is described as "straight, 

 and having the same direction as the body to which it belongs ;" 

 whereas it is intended, in the case of an embryo, to indicate that its 

 radicle is the lowest point ; that is, where the ovule is anatropous 

 with its foramen downwards, the embryo will be orthotropal, with its 

 cotyledons directed upwards. It seems advisable therefore to discard 

 this and the cognate words in reference to an embryo, per se ; as they 

 Vol. n. 2 n 



