176 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
the oral opening. There are three pairs of lateral dietellae and several (four 
usually) lucid spots in the hind wall. (After Norman.) 
Genotype. — Antropova (M embranipora) granulifera Hincks, 1880. Recent. 
Genus MEMBROSTEGA Jullien, 1903. 
1903. Membrostega Jullien, Bryozoaires provenant des campagnes de VHirondelle, p. 62. 
The mural rim is provided with four spines on the anterior lips of the orifice. 
The two outer spines acquire such development that they form by their ramifica- 
tions and their confluence an adventi- 
tious frontal above the real frontal, 
seeming to transform the Membrani- 
poridae into veritable Costulidae. 
Genotype. — Membrostega ( Lepralia ) 
ferox MacGillivray, 1868. Recent. 
Genus MEGAPORA Hincks, 1877. 
1S77. Megapora Hincks, On British Poly- 
zoa, Annals and Magazine Nat- 
ural History, ser. 4, vol. 20, p. 529. 
The zooecia have a strongly devel- 
oped, partially depressed cryptocyst, 
and an aperture surrounded by spines 
and with a well-developed vestibular 
arch. A compound operculum in which 
the valvular part and the accessory part 
are connected by a joint. A few 
pored dietellae. No avicularia. Hyperstomial ovicell, not closed by the opercular 
valve. 
Genotype. — Megapora ringens Hincks, 1877. Recent. 
Genus DISCOFLUSTRELLARIA D’Orbigny, 1851. 
1851. Discoflustrellaria D'Oebigny, Paleontologie franca ise, Terrain Cretace, vol. 5, Byro- 
zoaires, p. 507. 
The zoarium is free, orbicular, convex, often conical above, always concave 
below, composed of zooecia regularly arranged in radiating lines, each beginning 
with a deformed zooecium with the formation of annular transverse lines. Zooecia 
round or square, entirely open and deep. The side opposite the zooecial openings 
presents regular radiating lines not perforated at their surface. (See fig. 24 I, 
p. 85). 
Genotype. — Discoflustrellaria cloma D’Orbigny ,■ 1851. Cretaceous. 
Fig. 44. — Genus Antropova Norman, 1903. 
A, B. Antropova granulifera Hincks, 1880. A. 
Several zooecia, X 30. (After Hincks, 1880.) B. 
View of the back of a zooecium. a, openings re- 
sulting from tlie avicularia; below these are seen 
the pair of lucid bays, and below again the lucid 
spots. (After Norman, 1903.) 
