12 M. FOSLIE. [1905 



Lithothamnionese Fosl. 



Den bot. saml. 1902 (1903). 



Lithothamnion Phil. 



Wiegm. Arch. Jahrg. 3, Bd. 1 (1837), p. 387 ; Fosl. Syst. Surv. Lithoth. (1898). 

 p. 3, Rev. Syst. Surv. Melob. (1900), p. 10; char. mut. 



Subgen. Eulithothamnion Fosl. 

 Norw. Lithoth. (1895), p. 12; Syst. Surv. Lithoth. (1898), p. 4; Rev. Syst. 

 Surv. Melob. (1900), p. 1 1 ; char. mut. 



a. Crustacea. 

 1. Lithothamnion Lenormandi (Aresch.) Fosl. 1 ) 



Norw. Lithoth. (1895), p. 150; Melobesia Lenormandi Aresch. in J. Ag. Spec. 

 Alg. 2 (1852), p. 514. 



In Lithoth. Helgol. (1900) p. 78 Mr. Heydrich tries to show that I ought 

 not to be considered as the first author who referred this species to the- 

 genus Lithothamnion, but that this was properly done by him in the 

 pamphlet quoted. I have earlier pointed out the peculiarity of this wrong 

 statement, and there has been given no consideration to it by De Toni 

 in Syll. Alg. IV, p. 1756. Cp. Foslie. Bieten die Heydrich'schen Melo- 

 besien-Arbeiten eine sichere Grundlage? Det kgl. norske Videnskabers Sel- 

 skabs Skriiter. Trondhjem 1901. Pag. 9. 



When, on the other hand, De Tcni in Syll. Alg. 1. c. p. 1751 considers 

 Mr. Heydrich as the first author who referred L. lichenoides to the genus 

 Lithothamnion, I cannot acknowledge his statement to be right. In Corall. 

 insb. Melob. (Ber. der Deutsch. Bot. Gesellsch. 1897) p. 48 Mr. Heydrich 

 admitted the said species under the name of Lithophyllum lichenoides, 

 but in Melob. 1. c. p. 412 he refers the species to Lithothamnion. In 

 referring to this fact De Toni observes 1. c. : „(Foslie) nomen in Norw. 

 Lithoth. passim." In Norw. Lithoth. (1895) I have mentioned the species 

 both in the exordium and under Lithoth. investiens pag. 130. Besides I 

 admitted it as a species accidentally mentioned in the index 1. c. p. 178 

 under the denomination of „ Lithothamnion lichenoides (Ell. & Sol.) Fosl.". 

 This seems to me sufficiently justifying my claim to precedence. Therefore, 



