Aa =0.15 mm. „ ■ Z2 =0.45-0. oO mm. 



7 /^ , - ZiOOeCla , « or r> irv 



la =0.1o mm. I Iz =0.35-0.40 mm. 



KORTH AMEKICAN LATER TERTIARY AND QUATERNARY BRYOZOA. 133 



HIPPOPORELLA(7) 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. 



Measurements. — Apertura 



Affinities. — We have not discovered the oviccll 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.—Gai. 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 dista) zoeciimi; 



it is never closed by the operculum. On the line of pores there are small irregularly 



placed avicularia. 



,, . , . f7ia = 0.12mm. „ . fZ2 = 0.45-0.50 mm. 



Measurements. — Apertura , . ,„ Zooecia , nor n ic 



' I Za = 0.12 mm. 1 Z2 = 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 costiiles. 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.— Cut. 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. 



