NORTH AMERICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 97 



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.—C&t. No. 68537, U.S.N.M. 



Genus ARTHROPOMA Levinsen, 1909. 



(For description see Bulletin 106, U. S. National Museum, p. 351.) 

 AKTHROPOMA 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. 



-,, , » X fAa = 0.10mm. „ . fi2 = 0.70mm. 



Measurements. — Apertura , . , . Zooecia , _ __ 



^ lZa = 0.14mm. [62 = 0.50 mm. 



Aifinities. — The form of the rimule leaves no doubt regarding the arrangement 

 of this species in the genus Arthropoma. It differs from the genotype Arthropoma 

 cecUi 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.—€&t. No. 68538, U.S.N.M. 



Genus DAKARIA JuUien, 1903. 



(For description see Bulletin 106, U. S. National Museum, p. 359.) 



DAKARIA CHEVREUXI Jullien, 1903. 



Plate 45, fig. 7. 



1903. Daharia chevreitxi Jullien, Bryozoaires provenant des campagnes de VPirondellc (1886-1888), 

 R&ultats 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. —C&t. 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. 



