NORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 177 
HOLOPORELLA MASSALIS Ulrich and Bassler, 1904. 
Plate 25, fig. 7. 
1904. Cellepora massalis Ulrich and Bassler, Maryland Geological Survey, Miocene, p. 428, pi. 
117, fig. 3, 4. 
The original description by Ulrich and Bassler is as follows: 
Zoarium massive, composed of many layers, often nodose, always rough. Zooecia erect, very irreg¬ 
ularly arranged, four or five in 2.0 mm.; orifice circular with a thin raised peristome. Generally the peri¬ 
stome of each zooecium bears upon its inferior side a prominent rostrum containing a large avicularium 
pointing obliquely upward and outward. Surface of zooecia, excepting the peristome, coarsely punctate^ 
Ovicells not observed. 
Measurements. —AperturaFl^ ^ ^ mm ‘ 
1 1 la = 0. 17 mm . 
We have little to add to the description of Ulrich and Bassler and are only 
introducing a new photograph of the type specimen made on the same enlargement 
as the other species of this volume so as to better allow comparison. In the 
type we have observed a case of total regeneration which is very rare in the 
Cellepore bryozoa. This species differs from Holoporella orbijera in the very con¬ 
stant presence of a large frontal avicularium and in its smaller apertura. 
Occurrence .—Miocene (St. Mary’s formation): St. Mary’s River, Maryland (rare). 
Miocene (Choptank formation): Greensboro, Maryland (rare). Miocene (Calvert 
formation): Chesapeake Beach and Plum Point, Maryland (rare). 
Holotype. —Cat. No. 68702, U.S.N.M. 
HOLOPORELLA ORBIFERA, new species. 
Plate 25, figs. 3-6. 
Description .—The zoarium is free, large, very irregular; it forms most often 
lobate or branched masses 2 centimeters in length. The zooecia are large, little 
distinct, erect; the frontal is smooth and surrounded by areolar pores. The apertura 
is very large, orbicular, without cardelles, with a concave proximal border. The 
oral avicularia are rare and inconstant. The interzooecial avicularia are large 
elliptical, with neither pivot nor denticles. 
Measurements .—Apertura 
ha = 0.20 mm. 
la =0.20-0.25 mm. 
Affinities .—This species is very easily recognized by its large oral dimensions. 
It can be compared only with Holoporella magnijica Osburn, 1914, now living in 
the water off Florida, from which it differs in the absence of the small interzooecial 
avicularia. Osburn unfortunately has not indicated the enlargement of his figure. 
Occurrence .—Miocene (Duplin marl): Wilmington, North Carolina (rare) and 
Harvey’s Mills, Leon County, Florida (rare). Pliocene (Waccamaw marl): Wacca- 
maw River, Horry County, South Carolina (common). 
Cotypes.— Cat. Nos. 68703, 68704, U.S.N.M. 
HOLOPORELLA(t) ECHINATA, new species. 
Plate 25, figs. 1, 2. 
Description .—The zoarium is a globuliform mass, more or less gibbose. The 
zooecia are large, salient, convex, smooth. The apertura is subcircular, the prox- 
