NORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 
133 
HIPPOPORELLA(?) PAPULIFERA, new species. 
Plate 19, fig. 14. 
Description. —The zoarium incrusts shells. The zooecia are distinct, separated 
by a deep furrow, elongated, elliptical; the frontal is very convex, perforated by a 
double row of areolar pores, ornamented with little salient costules and covered by 
a more or less granular pleurocyst. The apertura is oblique, deep, located at the 
base of a peristomie, the peristome of which is spinous, very thin and little salient; 
the two cardelles are quite low. A hollow mucro in the form of a pimple hides the 
proximal part of the apertura. 
nr . . , k=0.15 mm. 
Measurements. —Apertura 7 - , _ 
1 la =0.15 mm. 
Zooecia 
Lz =0.45-0.50 mm. 
Iz =0.35-0.40 mm. 
Affinities. —We have not discovered the ovicell of this species. The frontal 
granulations are rare or numerous according to the place of the zooecia. On account 
of the obliquity of the aperture the two cardelles are visible only when the specimen 
is inclined to an angle of 45°. 
This species differs from Lepralia montifera Ulrich and Bassler, 1904, in its 
nontransverse aperture and from Hippoporella costulata in the absence of small 
adventitious avicularia. 
Occurrence. —Miocene (Choctowhatchee marl): Jackson Bluff, Ocklocknee 
River, 25 miles southwest of Tallahassee, Florida (very rare). 
Holotype. —Cat. No. 68612, U.S.N.M. 
HIPPOPORELLA COSTULATA, new species. 
Plate 45, fig. 14. 
Description. —The zoarium incrusts shells. The zooecia are distinct, separated 
by a deep furrow, hexagonal, widened; the frontal is convex and formed of an olocyst 
surmounted by a pleurocyst garnished laterally with areolar pores and with costules 
converging toward the oral mucro. The apertura bears two very small cardelles 
placed in the lower third ; the proximal border is somewhat concave and denticulated. 
The ovicell is globular, smooth, little salient, much embedded in the distal zoecium; 
it is never closed by the operculum. On the line of pores there are small irregularly 
placed avicularia. 
J . (k = 0.12 mm. „ . 0.45-0.50 mm. 
Measurements. —Apertura , _ , _ Zooecia , _ 0 _ . _ 
r ( Za = 0.12 mm. [ 22 = 0.35-0.45 mm. 
Variations. —The line of areolar pores is often doubled by another more interior 
one. The passage of the eggs, as in all the species of this genus, is assured by the 
embedding of the ovicell in the distal zooecium and in the presence of the oral mucro 
formed by the coalescence of the interareolar costules. In the vicinity of the 
ancestrula the zooecia have some large frontal pores. The species has neither 
peristome nor spines. 
Occurrence. —Pleistocene: Mount Hope, Panama Canal Zone (very rare). 
Holotype. —Cat. No. 68613, U.S.N.M. 
Genus LEPRALIA Johnston, 1847. 
The name Lepralia is retained for those species of the Hippoporae which show 
no ovicell and which cannot therefore be more definitely placed. 
