67 



What I suppose to be cystocarpic conceptacles have been found 

 in very small numbers in a couple of specimens of f. norvegica,. 

 in one of these together with some smaller and little developed 

 conceptacles which, not unlikely, are those of antheridia. The for- 

 mer are conical, low, 350 — 400 p. in diameter at the base, and 

 traversed by a canal about 20 /* in diameter. I have not succeded 

 in finding the carpospores. 



Remark on the synonomy. The Lithothamnia that G u n n e r u s 

 records under the name of Apora polymorpha among others pro- 

 bably includes the present species too. Thus the figure on pL 

 15, fig. 2 1. c. much resembles L. coralloides f. saxatilis. It seems 

 also to be probable, that the form delineated by Johnson Lc.pl. 

 24, fig. 5 is referrible to this species, and not unlikely identic with 

 or nearly related to f. flabelligera. Whether on the other hand 

 the two species described by Philip pi 1. c. really are identic with 

 L. coralloides is impossible to know without having access to the 

 original specimens, but they at least appear to be nearly related 

 to it, L. gracile perhaps according with f. flabelligera and L. 

 rubrum nearly connected with f. australis. 



Mentioning L. norvegicum in Contrib. IT, p. 7 I also referred 

 to it specimens, which, as remarked, I now consider partly belong 

 to L. apiculatum f. patula partly constitute a separate species, 

 the below described L. diver gens. On the other hand I have lost 

 the specimens recorded under the same name in Contrib. I, p. 6 

 from Mehavn in East-Finmarken, and I am not sure whether they 

 belonged to the present species in the sense here taken. So far 

 as I now remember it was not typical f. norvegica, but rather a 

 form of L. apiculatum. Therefore, I do not adopt this locality 

 in the present paper. 



Relation to other species. Cp. under L. apiculatum, L. gra- 

 cilescens and L. divergens. 



Habitat. The species lives in the upper as well as the lower 

 part of the sublitoral region, with us descending to a depth of 

 about 15 fathom, but often also to be found only in 5 — 6 fathoms 

 water, seldom, however, farther up. On the British coast it occurs 

 on a depth of 6 — 10 fathom. Cp. Batt. 1. c. It prefers harder 



