THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY. 



[THIRD SERIES.] 



" per litora spargite museum, 



Naiades, et circum vitreos eonsidite foutes : 

 Pollice virgineo teneros hie carpite flores : 

 Floribus et pictum, diva?, replete canistrum. 

 At vos, o Nymphae Craterides, ite sub undas ; 

 Ite, recurvato variata corallia trunco 

 Vellite muscosis e rupibus, et mihi conchas 

 Ferte, Dea? pelagi, et pingui conchylia succo." 



N. Parthenii Gianneltasii Eel . 1 . 



No. 7. JULY 1858, 



I. — Observations on the Reproduction of certain Nostochineae. 

 By M. G. Thuret*. 



[With a Plate.] 



1 HE Nostochineae are among those tribes of Algae of whose 

 reproduction we know least. About thirteen years ago I de- 

 scribed the curious phenomena accompanying the reproduction 

 of an aquatic Nostoc f. Since then, no one appears to have taken 

 up this subject ; and M. Fischer J, in his memoir on this family, 

 remarks that my observations have remained isolated up to this 

 time. 



But the mode of reproduction which I made known is cer- 

 tainly not peculiar to one species. I cannot doubt that it will 

 be found in all, when it is sought for with a little attention and 

 perseverance. Already the correctness of this assertion has been 



* Translated from Mem. de la Societe des Sc. Nat. de Cherbourg, 

 Aug. 1857.— A. H. 



t Ann. des Sc. Nat. 3 ser. ii. p. 319 (1844). The plant forming the object 

 of that paper was not the true Nostoc verrucosum, but a neighbouring 

 species which M. Mougeot had published under this name (Stirpes Crypt. 

 Vog. Rhen. fasc. viii. no. 798), and which now bears that of Nostoc Mou- 

 geotii, Breb. (Menegh. Monogr. Nostochin. Italic, p. 113; Kiitz. Sp. Alg. 

 p. 300.) 



X Beitrage z. Kenntniss der Nostochacese, Berne, 1853, p. 13. 

 Ann. $ Mag. N. Hist. Ser. 3. Vol. ii. 1 



