M. C. Montagne on Ctenodus Labillardieri. 265 



is very remarkable, ]\I. 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. Fuc. 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 natm-alists at a time when the Algse 

 have been made the subjects of so many im])ortant 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 (iVlg. Medit. et Adi-iat. 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 filis receptaculorum forsan 

 adest, hcet 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. MoxTAGXE, 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 

 addi-essed to you in the com-se 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 tigm-ed 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 ' Historia Fucorum.' A recent com- 

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



