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 Schizoporella 

 rulgaris 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. 



A 20 



B20 



1x85 



FIG. 15G. Genus Hippopodina Levlnsen, 19CI9. 



A-J. Hippnpotlina fecgeensis Busk, 1884. 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, 

 xtvu from the left side wall, X 20. (A-F after Levinseii, 1909.) G, H. Zooecia with avicularia 

 and with large ovicell. (After MacGillivray, 1891.) I, .T. Operculuin and avicularian mandible. 

 X 85. (After Waters, 1913.) 



Genus HIPPOPODINA Levinsen, 1909. 



1909. Hippopodina LEVINSEN, Morphological and Systematic Studies on the Cheilostouuitmis 

 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 (LepraMa) feegeensis Busk, 1884. 



Range. Jacksonian Recent. 



HIPPOPODINA VIBRACULIFERA Canu and Bassler, 1917. 



Plate 69, figs. 9-14. 



1917. Hippopodina riliracitUfcra CANU and BASSLEE, 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 



