M. C. Montagne on Ctenodus Labillardieri. 265 



is very remarkable, M. de la Pylaie, who has analysed on the spot 

 at Terre Neuve a great number of individuals of this same spe- 

 cies, has never, more than myself, met with the other form of 

 fructification. Nevertheless, Lyngbye has represented the basi- 

 spermal fructification of this species, and Turner (Hist. Fm . t.98) 

 says even positively that in it he has seen the two sorts of fila- 

 ments in the same conceptacle, and what is more, he represents 

 them in such a way that one cannot fail to recognise them. 



Such are the facts on which I found my opinion respecting the 

 two modes of propagation in the Fucacea. I shall not conceal 

 their insufficiency, for I freely acknowledge that they want the 

 sanction of experience. Nevertheless, the subject appears to me 

 to merit the attention of naturalists at a time when the Algse 

 have been made the subjects of so many important researches. 



Some time ago M. M. Crouan (An. Sc. Nat. xii. p. 250) had 

 spoken of the double fructification of Himanthalia, and more re- 

 cently M. J. Agardh (Alg. Medit. et Adriat. p. 45) has agitated 

 this same question, which had occupied my attention long ago, 

 by expressing it under the form of a doubt. For example, he 

 says, " Alter fructificationis forma in fijis receptaculorum forsan 

 adest, licet hoc experimentis directis nondum probatum fuerit ." 

 The opinion of the celebrated Swedish phycologist, although 

 stated with such reserve, appears to me to give some value to 

 that which I have been attempting to sustain in this short notice. 

 Whatever judgement maybe passed on this, I shall persist in be- 

 lieving that there is in this matter something more than has been 

 hitherto recognised, and that it is a subject of research which 

 interests in a high degree the science of Algology. 



XXXIII. — Further Observations on Ctenodus Labillardieri. By 

 C. Montagne, D.M., in a Letter to the Rev. M. J, Berkeley, 

 M.A., F.L.S. 



My dear Friend, 



You doubtless recollect that some time since you communicated 

 to one of your Botanical Journals some observations which I had 

 addressed to you in the course of our correspondence upon the 

 fructification of the new genus Ctenodus. You will recollect too 

 that I begged you to procure for me if possible a single fruit of the 

 specimen figured in the excellent work of Turner ; for I could not 

 persuade myself that so excellent an observer could have seen but 

 one cell where I had seen twenty. It appeared then more than 

 probable that the singular fructification which I have published, 

 and which had also been observed by Mr. Harvey, was not the con- 

 ceptacular form figured in the l Historia Fucorum.' A recent com- 

 Ann. $ Mag. N. Hist. Vol. xiv. T 



