348 The American Geologist. December, 1902. 
Position and locality: Coal Measures; Roca and Plaltsmouth, Ne- 
braska. 
Fenestella conradi var. compactilis n. var. 
PI. XXII. Figs. 1, 2. 
Zoarium a very thick compact foliar expansion supported by a stalk 
and root-like processes. The best specimen secured is 4 cm. high by 
2 cm. Avide ; the root-like supports are i to 2 mm. in diameter. 
Branches straight or slightly flexuous, unusually thick from obverse to 
reverse, close set, quite regular in form and size, average 0.35 mm. 
wide, 0.4 mm. below and 0.3 mm. immediately above a bifurcation, nine 
or nine and one-half in 5 mm. ; reverse face smooth, without nodes, 
slightly smaller than the obverse, but not the difference noted in typi- 
cal specimens of the species ; striations show on the stall: and for a 
short distance out on the branches, especially when worn. Median 
carina of the obverse face not very prominent, rounded, straight or 
slightly flexuous, with small spines or nodes placed in two faint rows. 
Fenestrules on the reverse, circular, slightly elliptical in young por- 
tions of the zoarium, 0.25 to 0.35 mm. across at the surface, much 
contracted and nearly obliterated deeper in the frond, eight and one- 
half or nine in 5 mm., a little longer and less wide on the opposite 
face. 
Zooecia in two alternating ranges. Apertures circular, peristome 
faint or wanting, two and never three to each fe.iestrule, encroach 
slightly on the fenestrule, eighteen in 5 mm. 
This variety may prove a distinct species. F. sp. ( ?) differs in 
mode of growth. Also the keels and reverse faces are dissimilar; the 
rounded irregular keel which at places shows two rows of small nodes 
brings to mi.id F. binodata n. sp. Type specimens in the museum of 
the University of Nebraska, Lincoln, Nebraska. 
Position and locality: Coal Measures; South Bend and Roca, Ne- 
braska. 
Fenestella s/> (P) 
PI XXII. Figs 3-5. 
Zoarium a regular rapidly or slowly expanding net work. The larg- 
est specimen, not complete, is 3.75 cm. high by 2.5 cm- wide. Branches 
rigid or flexuous, much the wider on the obverse face, narrowly 
rounded and thin on the reverse being 0.16 to 0.24 mm. wide, nine or 
ten in 5 mm. Carina quite prominent, thin, varying with the growth, 
about 0.06 mm. across at the top where it appears sinuous bearing e. 
row of flattened nodes ; nodes o.i mm. long by 0.06 mm. wide at the 
base, 0.2 to 0.3 mm. apart from apex to apex. 
Dissepiments on the obverse, not constant in character, about 0.15 
mm. wide, depressed, expanded terminally, modifying the fenestrules ; 
on the reverse, slightly smaller, long and without much terminal ex- 
pansion, on a level with and of the same character as the branches. 
