NORTH AMERICAN EARLY TERTIARY BRYOZUa. 
173 
STAMENOCELLA GRANDIS, new species. 
Plate 31, fig. 16. 
Description. — The zoarium is bilamellar and free. The zooecia are large, dis- 
tinct, very elongate, narrow, especially at the back; the mural rim is thin, salient, 
curved, thinnest at the base. The opesium is large, entire, elliptical. The avicu- 
larium is small, salient, obliquely directed toward the top of the zoarium. 
M easuremenis- — Opesia 
\lxo— 0.60-0.70 mm. 
I lo= 0.20-0.22 mm. 
Zooecia 
\lz 
s=1.10-1.20 mm. 
= 0.32-0.35 mm. 
V aviation and affinities. — The micrometric measures are quite variable, but are 
always larger than those of closely allied species. We have specimens from near 
Monroeville, Alabama, and near Woodward. Mississippi, where the zooecial length 
is 1 mm. At the Chipola River locality they vary between 0.81 mm. and 0.90 mm. 
The surface ornamentation is much less variable than in S. mediaviculifera 
which probably inhabited areas with more rapid marine currents. The form of the 
zooecium is that of a stamen with a large anther whence the generic name. 
Occurrence. — Vicksburgian (“ Chimney rock ” of Marianna limestone) : One 
mile north of Monroeville, Alabama (rare). 
Vicksburgian (Bvram marl) : One-fourth mile west of 'Woodward. Wayne 
County, Mississippi (rare). 
Upper Jacksonian (Ocala limestone) : Chipola River, east of Marianna, Jack- 
son County, Florida (very rare). 
Holotype. — Cat. No. 63946, U.S.N.M. 
STAMENOCELLA INTERMEDIA, new species. 
Plate 81, fig. 5. 
Description. — The zoarium is free, compressed, formed of two lamellae growing 
back to back and inseparable. The zooecia are distinct, elongated, with a concave 
gymnocvst; the mural rim is thin, salient, curved, finely granulated. The opesium 
is elliptical or oval, the narrow part at the base. The hyperstomial ovicell appears 
voluminous. The avicularium is placed in the middle of the gymnocyst; it is large 
and salient; its orifice is oblique and turned toward the lower part of the zoarium. 
Affinities. — We have found only the single fragment figured which has appeared 
very interesting to us on account of its general aspect which approaches that of a 
Bugula with a bilamellate zoarium. 
Stamenocella intermedia differs from S. mediaviculifera in its. smaller micro- 
metric dimensions and its four longitudinal rows of zooecia. 
It is readily distinguished from Stamenocella midioayanica by its avicularium 
directed toward the base of the zoarium. 
This species is really intermediate between typical Stamenocella and the afore- 
mentioned group of M embranipora ( Flustrella ) polymorpha D’Orbigny. 1852. 
Occurrence. — Vicksburgian (Glendon member of Marianna limestone) : West 
bank of Conecuh River, 1 mile below mouth of Sepulga River, Escambia County, 
Alabama (very rare). 
Holotype. — Cat. No. 64236, U.S.N.M. 
