NORTH AMERICAN EARLY TERTIARY BRYOZOA. 187 
small convex chamber. The hyperstomial ovicell is situated on the gvmnocyst of 
the distal zooecium. 
,, j. r\ • ^<>=0.30-0.32 mm. 
Measurements . — Opesia 7 „ . „ „ . 0 
L 1^=0.16-0.18 mm. 
Zooecia 
\Lz— 0.12-0.46 mm. 
I lz= 0.26-0.30 mm. 
Affinities . — The large size of its frontal avicularium and its greater micromet- 
ric dimensions clearly distinguish this species from Scrupocellaria cookei , with 
which it is associated. 
No trace of a scutum has been found, nor has a reason been obtained to explain 
the opesial lamella shown on some zooecia. One of our specimens is a branching 
segment showing, as determined by Waters some time since, that the articulations 
are calcified in such cases. The dorsal is an olocyst with two separated layers 
(fig. 11). 
This splendid species is named in honor of Mr. J. B. Milner, who has taken a 
keen interest in the bryozoa in his preparatory work upon the Tertiary fossils be- 
longing to the United States Geological Survey and the United States National 
Museum, and who has found many specimens for our study. 
Occurrence . — Vicksburgian (Marianna limestone) : Salt Mountain, 5 miles 
south of Jackson, Alabama (rare) ; Murder Creek, east of Castlebury, Conecuh 
County, Alabama (very rare) ; west bank of the Conecuh River, 1 mile below 
mouth of the Sepulga River, Escambia County, Alabama (common). 
Vicksburgian (Red Bluff clay) : 71 miles southwest of Bladen Springs, Ala- 
bama (rare). 
Cotypes. — Cat. Nos. 61238-64240, U.S.N.M. 
SCRUPOCELLARIA RESSERI, new species. 
Plate 81, figs. 20-23. 
Description . — The segments are formed of at least 10 alternating zooecia. The 
zooecia are distinct, with or without an elliptical gymnocvst; the opesium elliptical; 
mural rim is salient, thick, rounded, and bears two distal spines; the distal avicu- 
larium is very large and triangular; the frontal avicularium is smaller, projecting 
its pointed end above. On the dorsal the zooecia are distinct and convex; the 
vibraculum is straight, salient, and provided with a rectilinear groove. The ovicell 
is hyperstomial and situated on the distal zooecium. 
Measurements .- — Opesia q™' 
mm. 
Zooecia 
\Lz— 0.34-0.40 mm. 
Us =0.22-0.23 mm. 
Affinities . — This species differs from both Scrupocellaria cookei and S. milneri 
in the rectilinear groove of its vibraculum which gives it a false resemblance to 
Caberea. The specific name is in honor of Mr. Charles E. Resser, of the United 
States National Museum, who has been of assistance to us in the preparation of 
the illustrations for this work. 
Occurrence . — Vicksburgian (Glendon member of Marianna limestone) : West 
bank of the Conecuh River, 1 mile below the mouth of the Sepulga River, Escambia 
County, Alabama (common). 
Cotypes. — Cat. No. 64242, U.S.N.M. 
