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- 

 sity in study. The ovicell is transverse and appears to be closed (?) by the 

 opercnlar 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 Cauloramphus 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 (Bryozoan bed at base of Aquia formation) : 

 Upper Marlboro. Maryland (abundant). 



Plealotm>v>i. C'at. Xo. 63775, I .S.X.M. 



ELLISINA LAXA Canu and Bassler, 1917. 



Plate 25, figs. 1, 2. 



1917. KJlisina hijra CANU and BASSLES, Synopsis of American Early Tertiary Cheilostome 

 Bryozoa, Bulletin 96, United States National Museum, ]>. 19, pi. 2, fig. 7. 



Description. The zoarium incrusts pebbles and especial!}' 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. 



,, f 7/3= 0.75-0.95 mm. 



Measurements. Aooeci&l , n _ 



|fe=0.50-0.7omm. 



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 Ellixina (Semiflustrella) rhomboidaUs D'Orbigny, 

 1852, and E. (Reptoflustrella) oval is D'Orbigny, lSri-2, 1 in its dimensions twice as 

 large and in the ogival and nonrhomboidal form of the zooecia. It is the largest 

 known species of EUisinn. 



Occurrence. Middle Jacksonian : Wilmington. North Carolina (common); 

 En taw Springs, South Carolina (rare) : near Lenuds Ferry, South Carolina (rare). 



Upper Jacksonian (Ocala limestone) : 1| miles above Bainbridge, Georgia 

 (rare) : Chipola River, east of Marianna. Jackson County, Florida (rare). 

 ^Ai. Xo. 62580, U.S.X.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. 



i 18.->_. r:il.-,,ntologie Fi-nncaise, Terrain Cretace, Bryozoaires. vol. 33. pi. 730, fig. 5, and pi. 731, &s. ID. 



