Lithothamnion coralloides Cr. 



Fl. Finist. p. 151; Fosl. Lithoth. p. 62 (90). 



f. australis Fosl. 



1. c. 

 Descr. et Fig. Lithothamnion coralloides f. australis Fosl. 1. c. et t. 16, fig. 24 



— 31; tab. nostr. fig. 6 — 7. 



JRemarh on the spedes. Coll. Hariot No. 1. Two speci- 

 mens, one of which is fragmentary, agree well with the above 

 form of this spedes. Cp. fig. 6—7. As quoted 1. c. reproductive 

 organs were unknown in the three southern forms. In one of the 

 present specimens I found a solitary conceptacle that fully coincides 

 in shape with those in f. norvegica supposed to be cystocarpic 

 and antheridian conceptacles, conical, low and about 250 ^ in dia- 

 meter at the base. It appears not to be fully developed, and I 

 do not know whether it is of the former or the last named organs. 



Locality. California, according to Mr. P. Hariot. 



Lithothamnion magellanicum Fosl. mscr. 



L. fronde crustacea, usque ad circa 300 [i crassa, scabriuscula, 

 limbo lævi; conceptaculis sporangiferis superficialibus, nunquam 

 innatis, crebris, disciformibus, parum prominentibus, diametro 300 — 

 400 p-; sporangiis quaternas sporas foventibus, 120 — 130 \i longis, 

 40—60 ii latis. Fig. 8. 



Description of the spedes. Coll. Hariot No. 6. I have seen 

 but a solitary specimen which is represented. fig. 12. It forms a 

 thin crust, covering a shell, scarcely up to 300 p. thick in the 

 thickest parts, frequently apparently less. It is but slightly thinner 

 in the peripherical than in the central portions, here and there, ho- 

 wever, somewhat uneven in thickness. The surface is finely rug- 

 ged, partly nearly smooth, and the unevenness principally is caused 

 by growing over or covering up small extraneous objects, but also 

 thereby that the scars after emptied conceptacles are not regularly 

 effaced. It is not provided with scaly thickenings, nor have I seen 

 local formations effacing the named scars. The brim is smooth 

 or nearly smooth, not concentric zonate, feebly shining, and the 



