208 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
zooecium; its opesium is oval, narrowest below, contracted below the pivot. The 
ovicell is little apparent. 
Measurements. 
ORDINARY ZOOECIA. 
r. . \ho=0.08 mm. 
-OpesiaL _o.io 
mm. 
ORDINARY ONYCHOCELLARIA. 
Zooecia 
\Lz= 0.24-0.30 mm. 
1/2=0.20-0.30 mm. 
. [Aon=0.10 mm. 
°Pe sla { fon=0 .10 mm. 
r\ i n Lon=0 . 26 mm. 
Onychocellana foK=(m 
mm. 
MARGINAL ZOOECIA. 
. (Ae>=0.18-0.20 mm. „ 
vJDGSlcl I 7 r\ -t r* i^OOeClcl 
[/<?=0.16 mm. 
MARGINAL ONYCHOCELLARIA 
. f/mn=0.20mm. 
°‘ 5esla W=0.0Smm. 
Onychocellaria 
Lz= 0.40 mm. 
Za=0.30-0.40 mm. 
Z<m=0.46 mm. 
lon= 0.24 mm. 
Affinities and variations . — In its external aspect this species is only a small 
Onychocella angulosa; but one important and very characteristic difference is the 
size of the marginal zooecia of the zoarium. We have expressed these micrometric 
variations numerically above. 
Although small, the lateral indentations are very constant, even in the mar- 
ginal zooecia. In this respect the species differs from Onychocella georgiana. 
The ovarian zooecia have a somewhat larger opesium. 
Occurrence . — Middle Jacksonian: Wilmington, North Carolina (rare); near 
Lenucls Ferry, South Carolina (rare) ; Rich Hill, 5J miles southeast of Knoxville, 
Georgia (rare). 
Upper Jacksonian (Ocala limestone) : Nine miles north of Ocala, Florida 
(rare) ; west bank of Sepulga River, Escambia County, Alabama (rare) ; Old 
Factory, 1^ miles above Bainbridge, Georgia (rare). 
Cotypes. — Cat. Nos. 63959, 63960, U.S.N.M. 
ONYCHOCELLA DUPLICITER, new species. 
Plate 32, figs. 28-30. 
Description .- — The zoarium incrusts other bryozoa. The zooecia are hexagonal, 
elongated, with their mural rims confluent, dimorphous. The cryptocyst is shallow 
and as long as the opesium ; the opesium is oval, narrowest at the top ; the polypidian 
convexity occurs only on the small zooecia a; the opesiular indentations are very 
small and nearty symmetrical. The onychocellarium is narrow, falciform, longer 
than the zooecia ; its opesium is small, oval, narrowest below. 
Measurements . — 
Zooecia (a). 
Opesia 
ho =0.08 mm. 
Zo=0.10-0.12 mm. 
Zooecia 
[Zs=0.36 mm. 
\lz=0.2>0 mm. 
Zooecia B. onychocellaria. 
j7i<?=0.14mm„ \Lon=0.1^ mm. 
I 0.12 mm. Uem=0.06 mm. 
( Zs= 0.36-0.40 mm. \Lon= 0.50 mm. 
\lz=0. 28-0.32 mm. izD?r=0.30mm. 
