6 M. FOSLIE. [1899 



I have not seen an}^ specimen according with the figures 1. c, 

 but another specimen from Crouan':^ hands denominated as above. 

 It forms a few minute crusts about 1 mm. in diameter on Rhocly- 

 menia palmaia and Hydroids attached to the latter, provided with 

 a couple of conceptacles. As 1 have not had the opportunity to 

 examine any of these crusts more closely, T am not quite certain 

 to which species the}^ are to be referred, although, on the oiher 

 hand, I scarcely think to be wrong in referring them to Melohesia 

 farinosa. However, it is easy to be seen, that the plant described 

 and delineated by Crouan 1. c. does not represent the latter. On 

 the contrary, I venture to suppose that also this species as at first 

 apprehended by Crouan in fact represents a form of Melohesia 

 zonalis. The said figures do not give any good idea of the spe- 

 cies except flg. B. 8, although fig. B. 11 tolerably well represents 

 a part of a young crust with one layer of cells. 



Hapalidium confervoides Crn. 

 Fl. Finist p. 139; excl. s}ai. 



Hapalidium phyllactidium Crn. Ann. se. natur. p. 286, t. 21, fig. C. 14 — 20; 

 excl. S3^n. 



= Melobesia zonalis (Crn.) Fosl. 



I have seen a few very small and sterile crusts denominated 

 as above by Crouan himself, attached to a fragment of glass. 

 They are partly rather regular in outline, suborbicular, or nearlj^ 

 reniform, partly of irregular shape. Seen from above the cells ac- 

 cord well with those in M. zonalis, but I do not know with cer- 

 tainty whether these sterile crusts belong to the latter species, 

 although probably being so. They seem to be most nearly con- 

 nected with the form of this species attached to shells of snails 

 mentioned above. 



On the other hand, I am not in doubt that the above species as 

 delineated in Ann. se. natur. 1. c. represents a rather old specimen 

 of M. zonalis. However, in Fl. Finist. it seems to have been tåken 

 in a rather wide sense, perhaps including more than one species. 



Crouan identifies his plant \w\\h Melohesia confervlcola (Kiitz.) 



