42 
BULLETIN 125, UNITED STATES NATIONAL MUSEUM. 
,, . r\ ■ /m= 0.30-0.32 mm. 
Measurements. —Opesia 7 „ . 
r \lo = 0.20-0.24 mm. 
r, . Z 2 = 0.40inm. 
Zooecia 7 . on 
{12 = 0.30 mm. 
Affinities. —Our ovicelled specimen was not in a condition for photography, 
but it is well preserved and our generic determination is exact. We have observed 
some calcified and perforated zooecia. 
In the number of spines this species much resembles Membranipora echinata 
D’Orbigny, 1839. It differs from it in its oval opesia and in the presence of the 
interzooecial avicularium. It belongs to the group of Callopora tenuirostris. 
Occurrence. —Pleistocene: Santa Barbara, California (rare). 
Holotype. —Cat. No. 68453, U.S.N.M. 
CALLOPORA GUERNEI Jullien, 1903. 
Plate 45, figs. 3, 4. 
1903. Membranipora guernei Jullien, Bryozoaires provenant des Campagnes de VHirondelle (1886- 
1888), Resultats des Campagnes scientifiques du Prince de Monaco, fasc. 23, p. 40, pi. 5, 
fig. 3. 
Measurements.- 
~ . (^0 = 0.33 mm. 
^Pesiah 0 = 0 . 20 - 0.25 mm . 
Zooecia 
Lz = 0.45-0.50 mm. 
\lz = 0.30-0.38 mm. 
Affinities. —The micrometric measurements noted on Jullien’s figures are a 
little larger than ours; but as these are drawings and not photographs an error is 
always possible. Our specimens have the regularly oval zooecia shown in the 
figures of the French zoologist. Moreover, the interzooecial avicularia are identical 
with those described by Calvet in the same publication, “ils sont de forme ovoide 
a mandibule arrondie, et disposes soit obliquement, soit transversalement par rap¬ 
port au grand axe de zoo6cies.” 
Occurrence. —Pleistocene: Mount Hope, Panama Canal Zone (very rare). 
Habitat. —Gulf of Gascony at 135 meters. 
Plesiotypes. —Cat. No. 68454, U.S.N.M. 
CALLOPORA FILUM Jullien, 1903. 
Plate 45, fig. 5. 
1907. Membranipora filum Calvet, Bryozoaires, Expedition Scientifique du Travailleur et du Talis¬ 
man, p. 386 (bibliography). 
The ovicell of this species has not yet been described exactly, but Calvet writes 
that there are many ovicells which have the peculiarity of being operculated; that 
they are rather salient, have a semicircular basal contour and are provided with a 
semicircular orifice placed below the zooecial orifice. We believe that there is, 
therefore, no doubt in assigning the species to the genus Callopora, although the 
figure of Smitt, 1872, suggested an endozooecial ovicell. Our specimens are encrust¬ 
ing a coral. 
Occurrence. —Pleistocene, Mount Hope, Panama Canal Zone (rare). 
Habitat. —Northeast of Morocco (714 meters), Cape Verde Islands (110-180 
meters), Azores (80-318 meters), Corse and Florida (21-97 meters). 
Plesiotype. —Cat. No. 68455, U.S.N.M. 
