NORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 
151 
punctate zooecia with a subcircular orifice and a mucro like the preceding, but 
its zooecia are much smaller than Porella ( Palmicellaria ) convoluta Ulrich and 
Bassler, 1904, of the Maryland Miocene, and its mucro is less prominent. The 
ovicells however are relatively larger and longer. 
Measurements .—Apertura Zooecia, irregular. 
Occurrence .—Miocene (Calvert formation): Reeds, Maryland (very rare). 
Holotype. —Cat. No. 68656, U.S.N.M. 
Genus RHAMPHOSTOMELLA Lorenz, 1886. 
(For description see Bulletin 106, U. S. National Museum, p. 476.) 
RHAMPHOSTOMELLA LATICELLA Canu and Bassler, 19X9. 
Plate 5, fig. 13. 
1919. Rhamphostomella laticella Canu and Bassler, Geology and Paleontology of the West Indies, 
Bryozoa, Publications of the Carnegie Institution of Washington, no. 291, p. 94, pi. 5, 
fig. 12. 
The figured specimen is the only one found; it is unfortunately incomplete 
and worn and does not permit a detailed description. It incrusts a shell; the 
areolar costules are rare or little visible. The oral avicularium is quite large, 
oblique, the point directed toward the bottom. 
Occurence .—Lower Miocene (Bowden marl): Bowden, Jamaica (very rare). 
Holotype. —Cat. No. 68657, U.S.N.M. 
RHAMPHOSTOMELLA GRANULOSA, new species. 
Plate 3, fig. 2. 
Description .—The zoarium incrusts shells. The zooecia are distinct, separated 
by a deep furrow, elongated, elliptical; the frontal is very convex, covered with 
a granular pleurocyst and bordered with small areolar pores. The apertura is 
large, elongated, and deformed by a small, elongated, triangular avicularium 
arranged obliquely. The ovicell is globular, very salient, and covered also with a 
granular pleurocyst. 
, k = 0.15mm. 
Measurements .—Apertura 7 _ , 
r to = 0.10 mm. 
Zooecia 
Lz = 0.55 mm. 
lz = 0.25-0.30 mm. 
Affinities .—The zooecia are very irregular in their micrometric measurements. 
The areolar pores are often hidden by the pleurocyst. 
This species approaches Rhamphostomella hrendolensis Waters, 1891, which is 
often deprived of costules, but differs from it in the presence of the frontal granules. 
Occurence .—Miocene (Bowden marl): Bowden, Jamaica (very rare). 
Holotype. —Cat. No. 68658. U.S.N.M. 
