148 



Syn. Millepora polymorpha Ell. et Sol. Zooph. p. 130? 



„ „ var. globosa Esper, Pflanzenth. I, p. 214, t. 13? 



„ calcarea Lam. Hist. Anim. 2, p. 312? 



Nullipora calcarea Johnst. Brit. Spong, and Lithoph. p. 240; ex parte 



pl. 24, fig. 4? 

 Spongites polymorpha Kiitz. Spee. Alg. p. 699? 



Melobesia calcarea Harv. Phyc. Brit. pl. 291; Man. p. 108? Nee 

 Millepora calcarea Ell. et Sol. p. 129, t. 23, fig. 13. 

 „ compressa M'Calla, sec. Harv. Man. p. 108? 



Lithothamnion calcareum Aresch. in J. Ag. Spee, Alg. 2, p. 523? 



„ fasciculatum Solms Laub. Corall. p. 20 ; saltem ex parte. 



„ „ Kleen, Nordi. Alg. p. 11. 



„ „ Aresch. Obs. Phyc. 3, p. 5 ; ex parte. 



„ „ Gobi, Algenfl. Weiss. Meer. p. 22; ex parte. 



„ soriferum Fosl. Contrib. I, p. 6 ; II, p. 6. 



„ „ Stromf. Algveg. Isl. p. 18. 



„ „ Rosenv. Grønl. Havalg. p. 772; ex parte. 



Remark on the determination of the spedes. It scarcely ad- 

 mits of any doubt at all, that the plant recorded by Unger 

 under the above name and delineated 1. c. t. 5, fig. 14 is the 

 same that Kjellman 1. c. calls L. soriferum, and formerly ap- 

 pears to have been recorded under different names. It is described 

 from a specimen from Greenland, and the quoted figure accords 

 well with certain forms of the above f. squarrosa. I, there- 

 fore, adopt this name as the oldest one. Unger remarks 1. c. : 

 „Es scheint mir der Millepora •polymorpha var. tophiformis Esper 

 zu sein". However, the latter in my opinion is not any Litho- 

 thamnion, but probably a coral, and Esper himself appears to 

 have been doubtful whether it really was referrible to his M. po- 

 lymorpha. Cp. Esper, Pflanzenth. I, p. 221, t. 15. 



JRemark on the form of the spedes. The above forms are 

 not well defined, not even f. .alcicornis, as transitions are often 

 to be found, but they on the other hand deserve to be specially 

 mentioned. 



The form that I recorded 1. c. under the name of f. divari- 

 cata I now consider to include both the typical form of the spe- 

 des as well as one of its most extreme forms, f. squarrosa, arl- 

 though they pass rather gradually into one another, but that is 



