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. — Cat. Nos. 64084, 64085, U.S.N.M. 
HIPPOMENELLA TRANSVERSORA, 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, stir- 
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. 
M easurements . — Aperture 
j7m=0.12 mm. 
|Ja=0.14-0.16 mm. 
Zooecia 
| ZA= 0.80—0.90 mm. 
[73=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 are with Hippomenella costulatcC , 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 . — Yicksburgian (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. — Cat. Nos. 64274, 64275, U.S.N.M. 
HIPPOMENELLA PUNGENS, new species. 
Plate ST, figs. 1M. 
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 liyperstomial, 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 
