222 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
Affinities . — This is the largest known species of Floridina. This character 
and the large teeth in the opesium of its onychocellarium distinguish it clearly 
from Floridina antiqua and from F. laguncula. 
Occurrence. — Middle Jacksonian (Castle Hayne limestone) : Wilmington, 
North Carolina (common). 
TIolotype. — Cat. No. 63983, U.S.N.M. 
FLORIDINA ANTIQUA Smitt, 1873. 
Plate 35, figs. 10-18. 
1873. MoJlia antiqua Smitt, Floridan Bryozoa, Ivongl. Svenska Vetenskaps-Akademie 
Handlingar, vol. 3, p. 12, pi. 2, fig. 73 (not Busk). 
Descnption. — The zoarium is unilamellar, creeping over algae. The zooecia 
are broad, distinct, ogival in shape ; the cryptocyst is a little concave and very finely 
granulated; the polypidian convexity is a continuation of the cryptocyst; the 
opesium is subtrifoliate and contracted by two large lateral teeth which separate 
the opercular part from the opesiular portion. The opesiular indentations are 
large and wide; they are often transformed into true, nearly complete linear 
opesiules by the union of the opesial process with the polypidian convexity. The 
ovicell is a distal convexity little apparent, but clearly distinct from the cryptocyst 
of the distal zooecium. The onychocellarium is larger than the zooecium, elon- 
gated, with a submandibular area rounded but little developed; its opesium is 
oval, the pointed end at the top, much denticulated. 
Measurements. — Opesium \ho— 0.20-0.24 mm. „ . [Zs=0.50mm. 
(including opesiules) 0.20-0.24 mm. OOeCUlm |fe=0.40 m m. 
„ . fZmn=0.60mm. 
Onychooella™ m { ton=030mm 
Variations . — Interzooecial communication appears to be effected by a distal 
septula and 4 pairs of lateral septulae (fig. IS). The cryptocyst is as usual, formed 
from elements of the olocyst (fig. 18). 
In the interior (fig. 16), the form of the opesium is the same; we note further 
that there are two tuberosities roughly outlining laterally a polypi de tube. The 
proximal margin of the opesium of the onychocellarium is thickened. 
The union of the opesial processes with a polypidian convexity is frequent 
(fig. 18). On the more perfect specimens the length of the polypidian convexity 
is from 0.06 to 0.08 mm.; its width is from 0.14-0.16 mm. (fig. 11). It often 
diminishes in length without apparent reason and even disappears (fig. 12). 
The size and aspect of the zooecia vary greatly. Figures 13, 14, 15 are taken 
from the same zoarium, where there may be noted broad zooecia with a reduced 
cryptocyst, smaller zooecia with the cryptocyst much developed, and again very 
narrow zooecia. Usually most of the zooecia are broad, and most of the opesiules 
are large and incomplete. 
The zoarium sometimes incrusts shells; the polypidian convexity is then little 
apparent, and the opesiules are quite large. 
