(135 ) 
Explanation of plates 80-93 
PLATE 80 
1. Archaeolithothamnion dimotum, natural size, (0. 2667). 
2. Lithothamnion mesomorphum ornatum, natural size, (no. gozT). (A 
of the specimens except the one shown in the upper right-hand corner are of 
this variety.) 
PLATE 81 
1. Lithothamnion fruticulosum aemulans, natural size, (no. 2237). 
2. The same broken in two, showing the Lzthothamnion enclosing a coral 
Lithophyllum bermudense, natural nig (no. 199). The figure at the 
aon shows the plant enclosing a peb of coral sandstone, now broken 
intwo. The figure at the left shows ae crust of oe separated 
from the pebble and with the inner surface toward the came 
PLATE 82 
1. Gontolithon strictum nanum, natural size, (zo. 22 pets 
oniolithon Rhizophorae, natural size, (wo. gr70). The longest 
branches, sometimes reaching a height of about 10 ee were unfortunately 
broken off before the photograph was taken 
PLATE 83 
Lit, ithophyllum daedaleum, natural size, (no. 2676,type). The fragment at 
e upper right-hand corner is turned in such a way as to show the latero- 
ea surface of the cluster. 
PLATE 84 
Lithophyllum daedaleum, natural size, (0. 2793). The lower specimen 
represents a young condition of the species, bearing a few molariform 
branches and smaller elevations; the upper specimen shows an older form 
near the typical with the primary crust reduced or deficient. 
PLATE 85 
1. Lithophyllum daedaleum pseudodentatum, natural size, (no. 2675). 
2. Gontolithon accretum, natural size, (mo. 2920a, type). The upper end 
of the pebble is covered with Lithophyllum bermudense (no. 29206). 
3. Lithophyllum bermudense, natural size, (no. 799). Another view of a 
of the same pebble shown in Plate 81, f. 3, exhibiting more of the sur- 
face of the Lithophyllum ; a part of the crust, however, is broken away. 
PLATE 86 
Lithophyllum (?) munitum, natural size, (wo. go23), encrusting a dead 
In the upper left-hand corner the Lzthophyllum (?) is partly over- 
grown by a Gontolithon. 
PLATE 87 
Sie Sioa dimotum, Photograph of a vertical section (de- 
calcified) about toy thick, magnified 165 diameters, showing sporangia. 
because it showed the sporangia better than any other that was secured. 
