NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
223 
Affinities. — This species differs from Floridina laguncula in its larger micro- 
metric dimensions {Lz= 0.50 mm. and not 0.40 mm), in its nearly always trifoliate 
opesium, and in its large and rounded opesiular openings. It is smaller than 
Floridina onydentata. 
Occurrence. — Middle Jacksonian: Wilmington, North Carolina (common); 
near Lenuds Ferry, South Carolina (common) ; Baldock, Barnwell County, 
South Carolina (common) ; 3J miles south of Perry, Georgia (rare) ; 34 miles 
north of Grovania, Georgia (rare) ; 14 miles northeast of Lily, Dooly County, 
Georgia (rare). 
Upper Jacksonian (Ocala limestone) : Bainbridge, Georgia (rare) ; 14 miles 
above Bainbridge, Georgia (rare). 
Vicksburgian (Marianna limestone) : Salt Mountain, 5 miles south of Jackson, 
Alabama. 
Vicksburgian (Byram marl) : Byram, Mississippi (rare). 
Habitat. — Smitt’s original specimens were obtained in the waters of Florida, 
where the species ranges in depth from 29 to 44 fathoms. 
Plesiotypes. — Cat. No. 63984, U.S.N.M. 
FLORIDINA LAGUNCULA, new species. 
Plate 36, figs. 1-6. 
Description. — The zoarium is free, unilamellar, creeping over algae, or incrust- 
ing stones, shells, or bryozoa. The zooecia are a little elongated, distinct, confluent 
through their mural rims; the cryptocyst is shallow, oblique, directed toward 
the opesium, very finely granular; the mural rim is projecting in front, convex, 
separated from the cryptocyst. The opesium is limited to the elliptical, trans- 
verse opercular portion ; the two opesial processes are quite salient and are situated 
above the polypidian convexity, which is thus little apparent. The onychoeel- 
lariiun is elliptical, elongated, larger than a zooecium; its opesium is oval, divided 
into two parts, a lower one large and nearly round, and a distal one narrow and 
linear. 
Measurements. — Opesium j ho=0.10-0.12 mm. 7 . \Lz=0A0 nun. 
(including opesiules) ifo— 0.20 mm. ooecium | fe— 0.30-0.35 mm. 
^ . ... rZ<9n=0.55 mm. 
Unychocellarium \ 7 A 
[7on.=0.33 mm. 
Variations. — In tangential sections the zooecial Avails appear very thin (fig. 
5). In the interior, the opesium is trifoliate or has the aspect of Tkalamoporclla 
or of Steganoporella (fig. 6). On the loiver face of the zoarium, the zooecia are 
elongated, hexagonal, convex, and bear a projecting hydrostatic tuberosity (fig. 3). 
The opesiules placed between the polypidian convexity and the opesial processes 
are hardly visible because they are thus perpendicular to the zooecial plane. But 
with the reduction of the processes they become visible in the form of rounded 
lateral openings (fig. 4). 
In some specimens from the Vicksburgian the proximal border of .the onveho- 
cellarian opesium is straight and the opesium itself is oval. 
