128 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
We have little to add to the description given by Ulrich. The specimens are 
very fragile, much altered, and do not lend themselves readily to dissection neces- 
sary in study. The ovicell is transverse and appears to be closed (?) by the 
opercular valve. The distal avicularium occurs frequently and is rather large, 
round, and without pivot. 
The septulae are large, plainly visible, and do not appear to correspond to the 
number of dietellae. They are also extremely fragile. After rubbing away the 
surface only a large distal and a lateral pair have come to view. The lateral 
dietellae are perhaps divided into three portions corresponding to the three pairs 
of normal septulae. If this should be so, this species is incorrectly placed in the 
genus Ellisina and should be classed in C auloramphus Norman, 1903. In the latter 
genus, however, according to its author, the ovicells are “ very shallow and incon- 
spicuous,” which is not the case in the present species. 
Occurrence. — Lowest Eocene (Brvozoan bed at base of Aquia formation) : 
Upper Marlboro, Maryland (abundant). 
Plesiotypes. — Cat. No. 63775, U.S.N.M. 
ELLISINA LAXA Cami and Bassler, 1917. 
Plate 25, figs. 1, 2. 
1917. Ellisina laxa Canu and Bassler, Synopsis of American Early Tertiary Cheilostome 
Bryozoa, Bulletin 96, United States National Museum, p. 19, pi. 2, fig. 7. 
Description. — The zoarium incrusts pebbles and especially shells. The zooecia 
are large, distinct, broad , ogival; the mural rim is very thin, little salient, curved, 
finely striated. The opesium is very large and of the same form as the zooecium. 
The avicularium is triangular, interzooecial, transverse, and without pivot. 
Measurements. — Zooecia 
f 7^3=0.75-0.95 mm. 
| tz= 0.50-0.75 mm. 
Affinities. — The dietellae open into the zooecia in large pores which are really 
the remains of multiporous septulae. The ovicell is rare and very small. 
The species differs from Ellisina ( Semiflustrella ) rhomboidalis D’Orbigny, 
1852, and E. ( Reptoflustrella ) oralis D’Orbigny, 1852, 1 in its dimensions twice as 
large and in the ogival and nonrhomboidal form of the zooecia. It is the largest 
known species of Ellisina. 
Occurrence. — Middle Jacksonian: Wilmington, North Carolina (common); 
Eutaw Springs, South Carolina (rare) ; near Lenuds Ferry, South Carolina (rare). 
Upper Jacksonian (Ocala limestone) : 1J miles above Bainbridge, Georgia 
(rare) ; Chipola River, east of Marianna, Jackson County, Florida (rare). 
Holotype. — Cat. No. 62580, U.S.N.M. 
ELLISINA BREVIS, new species. 
Plate 25, figs. 4-6. 
The zoarium incrusts other bryozoa. The zooecia are elongated, distinct, 
oval, short, narrowest at the base; the mural rim is very thin, projecting but little, 
1 1852, Paleontologie Francaise, Terrain Cretace, Bryozoaires, vol. 35, pi. 730, fig. 5, and pi. 731, fig. 16. 
