89 
Favosites nitella. —Related to O. spongites , var. ramosa 
Goldf. In small masses varying from globoid to elongate or 
scarcely branching. Cells sub-circular, sub-equal, with a few 
minute interstitial ones. Septa distinct, irregular, complete or 
incomplete; pores scattered, indented around the orifices. 
Distance of pores .76 mm. (.03) ; diameter of largest cells .76 
mm. Occurs also at Iowa City. 
Favosites pumosa. —Resembles F Alpenensis in size and 
form of cells and cell-mouths, and in size and arrangement of 
pores, but differs in much more crowded and thicker septa, 
and in growing in stout, thickly-clustered branches. Distance 
of septa .51 mm. (.02). 
Lunatipora (New Genus).—Massive, or with branches 
consolidated; cells elongate, radiately ascending and curving 
outwards from an imaginary flexuons axis, compressed, their 
transverse section bounded by two or three segments of cir¬ 
cles, often sub-crescentic; walls apparently double, but not 
separable (?) ; destitute of communicating pores as far as 
known; interior with transverse diaphragms. Cell-mouths 
not seen. . 
Differs from Favosites and Chcetetes in the form of the cells, 
and from the former in the probable absence of pores ; from 
Alveolites and Cladopora in the great lengthjof the cell-tubes, 
and from the latter in the presence of distinct diaphragms, and 
a more massive form. 
Luhatipora MroHiGAisrEiisis.—Cells small, much flattened ; 
diaphragms rather remote, complete or incomplete, often ob¬ 
lique. Longer diameter of larger cells 1.55 mm. >(.06) to 2.03 
mm. (.08); shorter diameter .51 mm. (.02). 
Alveolites strigillata. —Somewhat ramose ; cell-mouths 
crowded; transverse section at aperture double-convex; 
outer lip slightly elevated in the middle—often with a narrow 
rim either inflected or reflected; inner side of aperture marked 
by 10-15 delicate striae, which diverge and extend over the 
outer lip of the contiguous cells above. Transverse diameter 
of cell-mouths 1.27 mm. (.05) : distances apart longitudinally 
1.02 mm. (.04). 
Alveolites megastoma. —Thin incrustations, with large, 
crowded, obliqe cell-mouths which have the form of a segment 
of a circle in transverse section; outer lip, when perfect, lying 
in a plane normal to the general surface, its exterior marked 
by minute distinct transverse lines of growth; radial striae 
very obscure. Transverse diameter of cell-mouths .28 mm. 
(.11) ; distances apart longitudinally, the same. 
Chjetetes Hamiltonensis. —Incrusting, or in solid tuber¬ 
cular masses or stems, with crowded, prismatic tubes .25 mm. 
(.01) in diameter, diverging in all directions at right angles 
with the main axis; cell-walls simple; septa complete .25 mm. 
