190 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
Affinities. — This species is perfectly characterized by its distal avicularium, 
which is large and very salient. It differs from Scrupocellaria elliptica Reuss, 1869, 
in which the dorsal side is very similar, exactly in the quite different form of the 
distal avicularium. 
We dedicate this splendid and remarkable species to Dr. T. Way land Vaughan, 
under whose auspices the present work has been undertaken. 
Occurrence. — Vicksburgian (Red Bluff clay) : 74 miles southwest of Bladen 
Springs, Alabama (very rare). 
Holotype. — Cat. No. 64244, U.S.N.M. 
SCRUPOCELLARIA DUBIA, new species. 
Plate 32, figs. 10-14. 
Description . — The little fragments which we figure are hardly sufficient for the 
characterization of a species. The characters of the dorsal are quite distinct, but on 
the frontal side all of the zooecia observed appear to have undergone total regenera- 
tion. One of the segments seems to indicate the occurrence of chitinous joints, a 
condition which is not habitual in So % upoceilaria. The species necessitates further 
examination based upon numerous and better preserved specimens. 
Occurrence. — Middle Jacksonian: Near Lenuds Ferry, Georgetown County, 
South Carolina (rare). 
Cotypes.- — Cat. No. 63953, U.S.N.M. 
SCRUPOCELLARIA CLAUSA, new species. 
Plate S2, figs. 1-5. 
Desci'iption. — The zoarium is formed of segments with 12 zooecia arranged 
alternately. The zooecia are distinct, elliptical, provided with a gymnocvst; the 
mural rim is very thin, salient. The opesium is elliptical. The distal avicularium 
is large, transverse, much projecting, without pivot or denticle. No frontal avicu- 
larium. The opesium is covered by a membrane with lateral ribs; apertura semilu- 
nate, with the proximal border concave. On the dorsal side the zooecia are distinct 
and convex ; the vibraculum is straight and acuminate, and without groove ; adjacent 
to it is a small radicular pore. 
M easurements. — Opesia 
(Ao =0.20-0.26 mm 
l?<3=0.10 mm. 
Zooecia 
\Lz= 0.36-0.40 mm. 
\lz= 0.20 mm. 
Aperture 
ha— 0.06 nun. 
/a=0.08-0.09 mm. 
Affinities. — This species belongs to the group of S. marsupiata Jullien, 18S2, 1 
a recent species dredged in the great depths of the Atlantic off the northwest coast 
of Spain and between the Azores and the Bermudas. The French author states that 
1 Dragages du Travailleur, Bryozoaires ; esp&ees draguees dans l’ocean atlantique en 1SS1, Bulletin 
Societe Zoologique de France, vol. 7, pi. 13, figs. 17-20. 
