750 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
M easurements .- — 
Diameter of the peristome 0.10-0.12 mm. 
Diameter of the apertura 0.08 mm. 
Distance between the peristomes 0.40 mm. 
Separation of the peristomes 0.50-0.60 mm. 
Length of the peristome 0.20 mm. 
.Width of the segments 1.00 mm. 
Affinities. — This species differs from Crisulipora proininens in its pluriserial 
zoarium. It differs from Crisulipora. flabellata in its dorsal surface, which is much 
more rugose, and in its nonflabelliform but fusiform and never bifurcated segments. 
O ccurrence . — Vicksburgian (Marianna limestone) : One mile north of Monroe- 
ville, Alabama (rare) ; west bank Conecuh River, Escambia County, Alabama 
(rare). 
Cotypes. — Cat. Nos. 65389, 65390, U.S.N.M. 
CRISULIPORA FLABELLATA, new species. 
Plate 154, figs. 21-24. 
Description. — The segments are pluriserial, flabellate, bifurcated. The tubes 
are distinct, cylindrical, arranged in irregular quincunx, striated; the peristome 
is thin, orbicular; the peristomie is well developed only on the lower tubes. The 
ovicell is enormous, globular, enveloping all the tubes of a segment; the oeciostome 
is very small. The dorsal face (basal lamella) is ornamented with transverse, very 
widely scattered striae. 
Diameter of the peristome 0.12 mm. 
, r , Distance between the peristomes 0.60 mm. 
Measurements . — Q ,. „ ,, . . n A „„ 
►Separation of the peristomes 0.50-0.60 mm. 
Width of the segments 1.6 mm. 
Affinities. — This species differs from Crisulipora rug osodorsalis in the flabellate 
(and not fusiform) form of its segments, and in its dorsal face ornamented with 
much smaller wrinkles. We learn from Miss Robertson’s work that the number of 
the embryos is very great in the ovicell of Crisulipora. On the other hand, if 
we note the great size of the ovicell of this species we are surprised at the rarity 
of the specimens found. Their extreme fragility and their special mode of habitat 
on floating algae must be the cause of this. 
Occurrence. — Vicksburgian (Marianna limestone) : One mile north of Monroe- 
ville, Alabama (rare). 
Cotypes. — Cat. Nos. 65388, 65483, U.S.N.M. 
CRISULIPORA GRANDIPORA, new species. 
Plate 155, figs. 7-11. 
Description. — We know only the biserial segments of the base of this species. 
The tubes are very long and very large , ornamented Avith small transverse Avidely 
spaced Avrinkles ; the peristome is thick, orbicular, salient. 
