119 



The only other form that I know, to which these show greater 

 affinity and might perhaps be referrible is that mentioned under 

 and for the present referred to L. clehiscens, but the fragments 

 are of old specimens differing in development from the latter. They 

 also differ from the named form especially by a little thinner, more 

 regularly divided branches and longer axes. I am, therefore, most 

 inclined to consider them identic with L. byssoides and not unlikely 

 representing a northern and larger form of the species than the 

 typical. I provisionally name it f. major. 



Habitat. Unknown to me. Specimens taken in the later half 

 of July were sterile. 



Occurrence. Only found on the most southern part of the 

 coast, at Mandal (Wille). 



Geogr. Distribution. The Mediterranean Sea (Lamarck, 

 Philippi); the Adriatic Sea (Hauck). 



Litho thamni on tophiforme Unger 



Leithakalk p. 21. Lithothamnion soriferum Kjellm. N. Ish. Algfl. p. 117 (88) 



f. globosa Fosl. 



Lithothamnion soriferum f. globosa Fosl. Contrib. II, p. 6. 



f. globosa vel subglobosa, ramis strictis, fastigiatis. 

 Fig. 1. c. t. 3, fig. 3. 



f. typica Fosl. mscr. 



Lithothamnion soriferum f. divaricata Fosl. 1. c. ; ex parte. 



f. subglobosa, ramis plus minusve patentibus, plerumque cur- 

 vatis vel interdum hamatis. Tab. nostr. 21, fig. 7, 10. 



f. squarrosa Fosl. mscr. 



Lithothamnion soriferum f. divaricata Fosl. 1. c. ; ex parte, 

 f. ramis squarrosis, plus minusve flexuosis vel hamatis, extre- 

 mis plerumque elongatis. Tab. nostr. 21, fig. 8 — 9. 



f. alcicornis (Kjellm.) Fosl. 



1. c. ; Lithothamnion alcicorne Kjellm. 1. c. p. 121 (91). 

 Descr. etFig. Lithothamnion alcicorne Kjellm. 1. c. et t. 5, fig. 1 — 8. 

 Fig. „ soriferum f. alcicornis Fosl. 1. c. t. 3, fig. 4. , 



Syn. Corallium pumilum Ellis, Corall. p. 83, p. 27, fig. C, No. 1 ? 



Millepora polymorpha Mohr, Isl. Naturhist. p. 141," 148; ex parte; t. 

 6, fig. b. 



