124 



anastomosed before being infested with the epiphyte. Mr. Batters 

 kindly sent me a specimen gathered many years ago at Round- 

 stone, and given to him by Dr. Paniter as Melob. calcarea of 

 Har.vey. He remarks: „I have little doubt that it is correctly 

 named". This specimen is sterile and much bleached, and it is 

 small and far slender than the cited figure by Harvey, but much 

 resembling L. tophiforme in habit, standing between f. typica and 

 f. squarrosa. It is, however, also more slender than the latter 

 frequently use to be, and, therefore, it perhaps belongs to L. fla- 

 bellatum f. Or emit. I am of opinion, that Melob. calcarea Harv. 

 in the main includes the present species, but not unlikely also 

 other species. Cp. Harv. and Johnst. 1. c. 



The form of Melob. calcarea mentioned by Harvey in Manual 

 p. 108 under the name of M. compressa M'Calla, not unlikely, 

 is identic with f. alcicornis or perhaps L. fiabellatum f. Rosen- 

 vingii. „lt differs from M. calcarea in having a compressed frond, 

 with flat branches broader towards the tip." Harv. 1. c. 



I on the contrary do not think Millepom calcarea Ell. et Sol. 

 1. c. identic with the species in question, referred to by Lamarck, 

 Johnston and Harvey 1. c, but more likely M. polymorpha 

 Ell. et Sol. 1. c. The former not even seems to be any Litho- 

 thamnion, but most probably a true coral. Cp. 1. c. t. 23, fig. 13. 

 It is described and figured from a specimen from the Mediterranean 

 Sea, and at any rate it cannot be the same species that Harvey 

 and Johnston record under the same name. 



One of the specimens of L. fasciculatum Aresch., that I 

 have seen probably belongs to this species, and is most nearly 

 related to f. typica. It is, however, sterile. 



Also L. fasciculatum Gobi partly includes this species. After 

 a part of the present paper was printed I got, through the kind- 

 ness of Prof. Chr. Gobi and Mr. C. Deckembach, a specimen 

 from the White Sea for examination, determined as L. fasciculatum 

 and probably being one of those quoted by Gobi 1. c. This spe- 

 cimen belongs to L. tophiforme f. typica, provided with concep- 

 tacles of sporangia, most of which, however, emptied. As Gobi 

 mentions specimens which fully accord with L. glaciale (L. fasci- 



