(133) 
crowded wart-like excrescences 3-6 mm. in diameter were devel- 
oped, but a closer examination shows that most, at least, of these 
are caused by irregularities of the substratum, by covering up ani- 
mals, etc. Including the animal growths that it covers or surrounds 
and its own older strata, the crust develops in places a thickness of 
8 orgmm. The few conceptacles examined were empty and it is 
not wholly certain whether they bore sporangia or cystocarps. 
The species stands nearest, on the one side, to Lzthophyllum papil- 
losum (Zanard.) Fosl.; and, on the other hand, in structure and in 
character of the conceptacles, it makes an approach to Lzthophyi- 
lum (Dermatolithon) macrocarpum (Rosan.) Fosl. It is, how- 
ever, easily separated from both. Numerous lateral connecting 
processes occur between the cells. It is, not unlikely, to be referred 
to the subgenus Dermatolithon. 
Lithophyllum daedaleum sp. nov. 
Subgenus Lulithophyllum Fosl. Rev. Syst. Surv. Melob. 17. 
Thallus attached, forming thin crusts from which issue short, 
crowded, repeatedly subdichotomous, frequently somewhat anasto- 
mosing, subfastigiate branches, these a he 2 mm. thick, with the 
apices roundish- thickened, truncate, or more frequently "depressed 
in the center, or subconcave and a ee dilated, surface of mass 
of perithallium and medulla cuboidal or subglobose to cylindrical- 
g, 1, long and short cells often regularly or 
irregularly alternating. (PLATES 83, 84, 93. 
orto Rico: On rocks that are much exposed to the surf, near 
low-water mark; Salinas Bay, near Gudnica (zo. 2676, type) ; near 
mouth of Gudnica Harbor (xo. 2659); Santurce (mo. 27937); San 
Juan (so. 2727). 
Lithophyllum daedaleum pseudodentatum var. nov. 
Diverging from type in having many of the branches broadened 
upward, plano-compressed, or subflabelliform, sometimes attaining 
a width (including anastomoses) of 2cm. (PLATE 85, F. 1. 
Porto Rico: On surf-beaten rocks, low littoral, Salinas Bay, 
near Guanica (xo. 2675). 
