374 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
Genus HIPPOPORINA Neviani, 1895. 
1895 Hippoporina Neviani, Bryozoi fossili della Farnesina Monte Mario presso Roma, 
Paleontologia Italica, p. 107. 
The operculum is much contracted laterally. , The cardelles are very large 
and always placed at the bottom of the aperture. The vanna is much smaller than 
the porta. The proximal border of the aperture is straight or somewhat concave. 
The ovicell is hyperstomial and closed by a special membrane without any connec- 
tion with the operculum. The frontal is an olocyst. 
Genotype. — Hippoporina ( Lepralia ) porcellana Busk, 1860, 
Range. — Danian-Recent. 
Fig. 114. — Genus Hippoporina Neviani, 1895. 
A. Hippoporina Integra Neviani, 1895. A. Ovicelled and ordinary zooeeia, X 25. (After 
Neviani, 1900.) 
B-E. Hippoporina porcellana Busk, 1860. B. Zooeeia. (After Smitt, 1872.) C, D. Oper- 
cula of same colony, X 85. (After Waters, 1898.) E. Operculum. (After Norman, 1909.) 
F, G. Hippoporina collaris Jullien, 1S88. F. Operculum, X 85. (After Waters, 1900.) 
G. Operculum. (After Norman, 1909.) 
H. Hippoporina elimata Waters, 1887. Operculum, X 85. (After Waters, 1885.) 
I. Flustra poissonii Audouin, 1826. Operculum, X 85. (After Waters, 1887.) (Intro- 
duced by error.) 
The recent species of this genus are : 
Hippoporina ( Lepralia ) porcellana Busk, 1860. 
Hippoporina ( Lepralia ) collaris Jullien, 1888. 
Hippoporina ( Lepralia ) elimata Waters. 
The fossil species are : 
Hippoporina integra Neviani, 1900. 
? Hippoporina ( Lepralia ) sulcifera Reuss, 1874. 
IHippoporina ( Eschar a ) conferta Reuss, 1847. 
IHippoporina ( Eschara ) delicata Manzoni, 1877. 
Hippoporina parvula Canu, 1909. 
Hippoporina hexagonalis Canu, 1916. 
