129 



bers like the latter. They are conical, rather low, generally 400 

 — 450 ft in diameter at the base, with a single orifice. The car- 

 pospores are nearly elliptical, elongated-obovate or broadly cune- 

 ate, 50 — 80 p. long and 35 — 40 p broad in the broadest part. 



Conceptacles of antheridia appear in the same individual as the 

 last named organ, resembling this in shape but only 250 — -300 p 

 in diameter at the base. Some few spermatia that I have seen 

 were roundish or rounded angular, compressed, and about 40 p 

 in diameter. 



Relation to other species. It is rather independent and can- 

 not in an older and fertile state be confounded with any other 

 known species. However, as remarked above, it shows greater 

 affinity to L. Lenormancli and L. Stromfeltii, and younger specie 

 mens are not always easily distinguished from the latter. Older 

 specimens somewhat remind one of L. polymorphum except with 

 regard to the colour, which is a darker or lighter pink, sometimes 

 with a lilaceous tinge. 



Habitat. It appears to grow in the upper part of the sub- 

 litoral region, fastened to smaller stones. At Helgoland it appa- 

 rently develops reproductive organs all the year, at least in Janu- 

 ■ary, March, June and October, on the Norwegian and British coast 

 in the former half of August. 



Occurrence. Only found at Mandal (VVille), a solitary spe- 

 cimen. 



Geogr. Distribution. Helgoland (Sonder, Kuckuck); Bri- 

 tain (Batters). 



Lithothamnion investiens Fosl. mscr. 



L. fronde Crustacea, substrato plus minusve adnata, parte 

 marginal! plerumque soluta, undulato-lobata, zonata vel parte in- 

 feriore subconcentrice jugosa; crusta 0.5— 1.5 mm. crassa, subnitida, 

 demum superimposita, scabriuscula, striis brevibus instructa ; ■ con- 

 ceptaculis cystocarpiferis(?) depresso-conicis, diametro circa 300 p. 

 Tab. 22, fig. 2—5. 



Syn. Lithophyllum zonatum Fosl. Contrib. I, p. 10. 



Description of the species. In the quoted paper I recorded a 



