150 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
Occuirence . — Middle Jacksonian (Castle Hayne limestone) : Wilmington, 
North Carolina (very rare). 
Holotype.— Cat. No. 63923, U.S.N.M. 
CALLOPORA FILOPARIETIS, new species. 
Plate 29, fig. 4. 
Description— The zoarium incrusts pebbles and Cellepores. The zooecia are 
elongated, distinct, elliptical, variable; the mural rim is very thin, filiform , salient, 
convex. The opesium is entire, medium, and of the same form as the zooecia. The 
ovicell is hyperstomial, never closed by the opercular valve, smooth, salient, trans- 
verse. The avicularia are small, very pointed, nearly perpendicular to the zoarial 
plane appearing to be interjected between the opesia. 
Measurements . — Opesia 
ho= 0.40-0.45 mm. 
lo=0 . 26 mm. 
Ovicells 
[A6w= 0.15 mm. 
\lov= 0.20 mm. 
Affinities— This species differs from the recent Membranipora macilenta 
Jullien, 1882, in which the walls are very thin, by its much smaller micrometric 
dimensions and in the form of its mural rim. 
The species having thin mural rims are not rare; they can be determined readily 
only if they bear ovicells and avicularia. 
Occui'rence . — Lower Jacksonian (Moodys marl) : Jackson, Mississippi (rare). 
Holotype. — Cat. No. 63921, U.S.N.M. 
CALLOPORA INGENS, new species. 
Plate 29, fig. 3. 
Description . — The zoarium incrusts rocks. The zooecia are elongated, little 
distinct, separated by a very small furrow, nearly hexagonal ; the mural rim is but 
little salient, convex, thin at the top, enlarged below, finely granulated ; the opesium 
is elliptical and finely crenulated. The hyperstomial ovicell is small, globular and 
projects considerably. The avicularium is very small, salient, oblique, the point 
below. 
M easurements . — Opesia 
\ho— 0.40-0.44 mm 
[7(9=0.24 mm. 
Zooecia 
Lz— 0.56-0.60 mm. 
7.3=0.40 mm. 
Affinities . — The avicularium is placed in a small triangular, interopesial cavity, 
the walls of which are often distinct. 
This species bears considerable resemblance to Callopora dumerilii Audouin, 
1826, differing from it only in its much larger dimensions and the inconstancy of 
its small avicularia. 
Occurrence . — Lower Jacksonian (Moodys marl) : Jackson, Mississippi (very 
rare) . 
Holotype. — Cat. No. 63920, U.S.N.M. 
