NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
797 
HORNERA JACKSONICA, new species. 
Plate 143, figs. 1-26. 
Description . — The zoarium is elliptical, ramified in the strict sense at a very 
acute angle. The tubes are invisible exteriorly ; they bear from two to four 
vacuoles, two of which are adjacent to the apertura and are arranged at the base of 
Fig. 257. — Genus Hornera Lamouroux, 1821. 
A-E. Hornera frondiculata Lamouroux, 1821. A. Complete zoarium, natural size. (After 
Milne-Edwards, 1838.) B. Dorsal of branch, X 25. C. An aperture greatly enlarged. D. 
Frontal, X 25. (B-D, after Busk, 1S75. ) E. Another view of the frontal, X 25. (After 
Waters.) F. Views of the fossil form referred to the species by Busk, 1859. 
one or two oblique sulci. The peristome is orbicular and little salient. The dorsal 
bears longitudinal sulci narrower than the nervi, and rather large vacuoles. The 
ovicell is elongated, elliptical, very globular, and quite punctate. 
