532 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
Variations. — The four specimens which we have found of this species have not 
permitted an attentive and detailed study. We think that it may serve as type 
of a special genus. In fact the apertura has not the “Hippo” form of the other 
species of the genus, for it appears to be more “ Schizo ” — that is to say, with rimule ; 
the two lateral avicularia are rather vibracula, analogous to those of SchizoporeUa 
vulgaris Johnston, 1847. 
The zooecia are elongated (fig. 8) or transverse (fig. 7). 
Occurrence. — Middle Jacksonian (Castle Hayne limestone) : Wilmington, North 
Carolina (rare). 
Cotypes. — Cat. No. 64180, U.S.N.M. 
Fig. 156. — Genus Hippopodina Levinsen, 1909. 
A-J. Hippopodina feegeensis Busk, 1SS4. A. Ovicelled zooecia, X 20. B. Zooecia without 
ovicell and with avicularia, X 20. C. Zooecium with another form of avicularia, X 20. D. Avi- 
cularia in another position, X 20. E. Avicularian mandible, X 25. F. A zooecium with ovicell, 
seen from the left side wall, X 20. (A-F after Levinsen, 1909.) G, H. Zooecia with avicularia 
and with large ovicell. (After MacGillivray, 1891.) I, .1. Operculum and avicularian mandible, 
X 85. (After Waters, 1913.) 
Genus HIPPOPODINA Levinsen, 1909. 
1909. Hippopodina Levinsen, Morphological and Systematic Studies on the Cheilostomatous 
Bryozoa, p. 353. 
The apertura is provided with two cardelles. The frontal is a tremocyst placed 
on a finely perforated and very thin olocyst. The ovicell is endozooecial. “The 
horizontal part of the distal wall is continued into an expansion which forms a 
partial partition between the ovicell and the zooecium; uniporous septulae; no 
peristome.” (Levinsen, 1909.) 
Genotype. — Hippopodina ( Lepralia ) feegeensis Busk, 1884. 
Range. — J acksonian — Recent. 
HIPPOPODINA VIBRACULIFERA Canu and Bassler, 1917. 
Plate 69, figs. 9-14. 
1917. Hippopodina vibraculifera Canu and Basslek, Synopsis of American Early Tertiary 
Cheilostome Bryozoa, Bulletin 96, United States National Museum, p. 61, pi. 5, fig. 8. 
Description. — The zoarium is free, bilamellar; the two lamellae, back to back, 
are easily separated. The zooecia are elongated, large, hexagonal; the frontal is 
