388 BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 



Occurrence. Lower Jacksonian (Moodys marl) : Jackson, Mississippi (com- 

 mon). 



Middle Jacksonian (Castle Hayne limestone) : Wilmington, North Carolina 

 (common). 



Upper Jacksonian (Ocala limestone) : Alachua, Florida (very rare). 



Cotypes.C&t. Nos. 64084, 64085, U.S.N.M. 



HIPPOMENELLA TRANSVEESORA, new species. 



Plate 86, figs. 20-24. 



Description. The zoarium is unilamellar and creeps over algae or incrusts 

 Orbitoides. The zooecia are elongated, distinct, ovoid; the frontal is convex, sur- 

 rounded by a double row of triangular areolae separated by short costules. The 

 aperture is transverse exteriorly; the peristome is complete and bears six distal 

 spines and a salient, proximal mucro. The ovicell is globular, prominent, hyper- 

 stomial, embedded in the distal zooecia, never closed by the operculum; the two 

 lateral areas are small and each is perforated with a large pore. The avicularia 

 are small, transverse, triangular, placed below the aperture on the line of areolae. 

 The ancestrula is a small zooecium. Three large lateral septules. 



r/ia=0.12mm. . i 3=0.80-0.90 mm. 



Mcasurements.-Aperturz j fa=(U4 _ 16 ^ Zooecia lz 3= 0.40-0.44 mm. 



Affinities. This species differs from Hippomenella alifera and Hippomenella 

 radicata in its transverse aperture and in the presence of an oral mucro. Its greater 

 affinities arc with Hippomenella costulata, from which it differs in its transverse 

 aperture, its much-developed mucro, the more constant presence of the spines, and 

 in its lamellar zoarium. 



Occurrence. Vicksburgian (Marianna limestone) : West bank of Conecuh 

 River, Escambia County, Alabama (rare) ; 1 mile north of Monroeville, Alabama 

 (very rare) ; Murder Creek, east of Castlebury, Conecuh County, Alabama (very 

 rare) . 



Cotypes.C&t. Nos. 64274, 64275, U.S.N.M. 



HIPPOMENELLA PUNGENS, new species. 



Plate 87, figs. 1-4. 



Description. The zoarium is free, unilamellar, creeping over algae. The 

 zooecia are regular, hexagonal, very little elongated, separated by a furrow. The 

 frontal is finely granulated, convex, surrounded by a double row of numerous very 

 small areolae. The aperture is in the form of a horseshoe and is provided very 

 inferiorly with two small cardelles; the anter is very large and the poster is small 

 and slightly concave; the peristome is thin and bears four small distal spines. 

 The ovicell is hyperstomial, globular, salient, embedded in the distal zooecia; it 

 bears superiorly some costules more or less prominent and inferiorly two areas 

 perforated by a large pore. The avicularia are small, triangular, symmetrically 



