NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
189 
SCRUPOCELLARIA RATHBUNI, new species. 
Plate 81, figs. 30-32. 
Description. — The segments are narrow and bear 10 alternating zooecia; their 
transverse section is triangular. The zooecia are distinct, oblique, slightly pyriform, 
and are without a cryptocyst; the opesium is pyriform and narrowest proximally; 
the mural rim is thin, rounded, and bears a short, hollow, projecting spine, which 
represents the scutum; the distal avicularium is simple and very small, but the 
frontal avicularium is very large and projecting, slightly oblique, with the point 
above and without pivot, but with two lateral denticles. On the dorsal, the 
zooecia are visible and convex; the avicularium is very oblique and terminates in 
a long spatulate groove; adjacent to it is a small projecting radicular pore. 
„ [Ae>=0.28 mm. 
M eamrernents. — Opesxa , _ . 
1 \lo =0.10 mm. 
Zooecial^iS^^T^MX^B mm. 
I fe— 0.24 mm. (Not counting projection of avicularium.) 
Affinities . — This species is excellently characterized by the large size and pro- 
jection of its frontal avicularia, which give to the zoarium a very bristling aspect. 
Otherwise the species is very close to the living S. retiformis Smitt, 1872. It is 
remarkable to observe the occurrence of species of this type throughout the ages in 
the same waters of Florida. 
The specific name of this very characteristic species is in honor of Dr. Richard 
Rathbun, late assistant secretary of the Smithsonian Institution, in charge of the 
United States National Museum, in appreciation of his work upon marine inverte- 
brates. 
Occurrence. — Vicksburgian (Glendon member of Marianna limestone) : West 
bank of Conecuh River, 1 mile below the mouth of Sepulga River. Escambia 
County, Alabama (rare). 
Holotype. — Cat. No. 64245, U.S.N.M. 
SCRUPOCELLARIA VAUGHANI, new species. 
Plate 81, figs. 28, 29. 
Description.— The segments are compressed and bear 10 alternating zooecia. 
The zooecia are distinct, oblique, elliptical, without cryptocyst, but with a small 
gymnocyst. The opesium is elliptical; the mural rim, thin and rounded, has a 
short, hollow, spine which is the trace of the articulation of the scutum. The 
frontal avicularium is small, little salient, triangular; the distal avicularium is 
large, triangular, without pivot and with a very sharp beak. On the dorsal side 
the zooecia are indistinct; the vibraculum is very large and triangular, whereas the 
radicular pore is very small. 
Measurements . — Opesia 
(7;<5=0.25 mm. 
[£<5=0.12 mm. 
Zooecia 
[£.3=0.45 nun. 
17,3=0.22 mm. 
