NORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 07 
In the absence of ovicells on the few specimens found we are unable to classify 
this species in the correct division of the Schizoporellae. 
Occurrence. —Miocene (Choptank formation): Jones Wharf, Maryland (very rare). 
Miocene (St. Mary’s formation): Cove Point, Maryland (rare). 
Holotype. —Cat. No. 68537, U.S.N.M. 
Genus ARTHROPOMA Levinsen, 1909. 
(For description see Bulletin 106, U. S. National Museum, p. 351.) 
ARTHROPOMA CORNUTA, new species. 
Plate 16, fig. 3. 
Description. —The zoarium incrusts shells. The zooecia are distinct, separated 
by a deep furrow, little elongate, swollen; the frontal is convex covered by large 
tremopores and ornamented by a small salient median protuberance. The apertura 
is semilunar, transverse and bears on its rectillinear, proximal border a very small 
sinus. 
Measuremerits. 
-Apertura 
ha = 0.10 mm. 
la = 0.14 mm. 
Zooecia 
jZ -2 = 0.70 mm. 
1/2 = 0.50 mm. 
Affinities. —The form of the rimule leaves no doubt regarding the arrangement 
of this species in the genus Arthropoma. It differs from the genotype Arthropoma 
cecili Audouin, 1826, only in the presence of the small frontal protuberance. 
Occurrence. —Miocene (Choctawhatchee marl): Jackson Bluff, Ocklocknee River, 
25 miles southwest of Tallahassee, Florida (rare). 
Holotype. —Cat. No. 68538, U.S.N.M. 
Genus DAKARIA Jullien, 1903. 
(For description see Bulletin 106, U. S. National Museum, p. 359.) 
DAKARIA CHEVREUXI Jullien, 1903. 
Plate 45, fig. 7. 
1903. Dakaria chevreuxi Jullien, Bryozoaires provenant des campagnes de VPirondelle (1886-1888), 
Rdsultats des Campagnes scientifiques du Prince de Monaco, fasc. 23, p. 90, pi. 9, fig. 6. 
We have found only a single specimen which is incrusting a coral, but in spite 
of its mediocre preservation we believe our determination to be exact. Each 
tremopore is surrounded by a small salient peristome. The oral avicularia are not 
constant. The proximal lip of the aperture ends in two condyles. 
Occurrence. —Pleistocene: Mount Hope, Panama Canal Zone (rare). 
Habitat. —Shores of Graciosa Isle, Azores. 
Plesiotype. —Cat. No. 68539, U.S.N.M. 
DAKARIA GRANDIS, new species. 
Plate 20, fig. 16. 
Description. —The zoarium incrusts shells. The zooecia are large, distinct, 
elongated, elliptical, separated by a deep furrow; the frontal is convex, ornamented 
with numerous small tremopores and minute granulations. The apertura is orbicu¬ 
lar or somewhat transverse; two strong condyles placed in the lower third limit the 
broad rounded sinus; the peristome is entire, thin, salient, finally denticulated. 
