conceptacles of sporangia, but some holes probably after these 

 organs, with the whole roof dissolved after the death of the plant, 

 are nearly 300 fi in diameter, thus apparently a little smaller in 

 this form than in f. capitellata. Cp. Fosl. 1. c. The specimen 

 is much bleached, probably found east on shore, and the branches 

 here and there rather rubbed. 



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



Lithothamnion pallescens Fosl. mscr. 



L. fronde subglobosa, irregulariter subdichotome ramosa; ramis 

 cylindricis vel interdum subcompressis, plus minusve coalitis, circa 

 2 mm. crassis, subfastigiatis, apicibus obtusis; conceptaculis cysto- 

 carpiferis convexiusculis, parum prominentibus, a superficie visis 

 diametro 250—300 fi. Fig. 11—13. 



Syn. L. racemus auet., ex parte? 



Description of the spedes. Coll. Hariot No. 5. I have seen 

 but a fragmentary specimen and two smaller fragments not un- 

 likely from the former. Cp. fig. 11 — 13. The longest diameter 

 of the largest of these is about 3.5 cm. Most of the ultimate 

 branches are broken. The plant forms subspherical balls that ap- 

 parently develop freely on the bottom. The colour appears to be 

 much faded, yellowish brown, but that of the living plant is un- 

 known. The frond is repeatedly branched in a more or less irre- 

 gular subdichotomous manner, and the branches are short, terete, 

 cylindrical or now and then slightly compressed, seldom very slightly 

 enlarged towards the tip, subfastigiate, with obtuse ends. Espe- 

 cially in the lower or central portions they are more or less ana- 

 stomosing. The surfa ce is smooth or nearly smooth. 



The structure seems to be coarser than for inst. in L. fruti- 

 culosum. The inner cells of the cup-shaped layers of tissue are, 

 in a longitudinal section of a b ranch, rectangular with rather thin 

 walls, up to about 20 p. long and 10 /* broad, or occasionally a 

 little more. 



The organs that I suppose to be conceptacles of cystocarps 

 are irregularly scattered or somewhat crowded at or below the tip 



