NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
185 
In 1817 Reuss discovered in the Vienna Miocene a species which he called 
In 1847 Reuss discovered in the Vienna Miocene a species which he called 
\ icentin, Italy, in 1869. In comparing- the excellent figures of Waters with the 
more reliable illustrations published by Reuss in 1874, it becomes probable that we 
are dealing with two distinct species. In 1875 Manzoni believed he had discovered 
the Scrupo cellar ia elliptica Reuss, 1874, in the Italian Plaisancian; his imperfect 
figure certainly led Sequenza and Neviani later into error. Finally the latter 
figured in 1900, still under this same name, a species undoubtedly distinct. The 
great geological distribution given by various authors to Scrupocellaria elliptica 
appears then to be erroneous. 
In 1887 Pergens identified Reuss’s species with Scrupocellaria scruposa Lin- 
naeus, 1758. This was an erroneous identification which, followed by Miss Jelly, 
introduced a grave error in her Synonymic Catalogue of Marine Bryozoa. In 1880 
Hincks believed he had found the same species living in English waters, but Waters 
thought that these specimens belonged to Scrupocellaria inermis Norman. 
Our specimens agree with the figures published by "Waters in 1891. Under 
the circumstances we believe it best to separate the Eocene species under the name 
Scrupocellaria elliptica Reuss, 1869. Future studies will be necessary before the 
status and name of the Miocene species can be determined. 
Description. — The small frontal avicularium is rather constant and is without 
a pivot. The same features hold for the distal avicularium. The dorsal vibracu- 
lum is transverse, conforming to the figure given by Waters. Immediately below 
this is the radicular pore. The impression of the scutum is visible. The micro- 
metric measurements are as follows: 
M easurements. — Zooecia 
Zs=0.46-0.50 mm. 
fe=0.18-0.20 mm. 
Opesia 
| /? <?= 0.24 — 0.28 mm 
jfo=0.10-0.12 mm. 
Occurrence. — Middle Jacksonian: Wilmington, North Carolina (very rare); 
near Lenuds Ferry, South Carolina (very rare). 
Geological distribution. — Priabonian of Vicentin, Italy (Reuss. Waters), and 
possibly in the Rupelian of Gaas, France (Reuss). 
Plesiotypes. — Cat. Nos. 63950, 63951, U.S.N.M. 
SCRUPOCELLARIA GRACILIS Reuss, 1869. 
Plate 32, figs. 8, 9. 
1869. Scrupocellaria gracilis Reuss, Die fossilen Anthozoen and Bryozoen der Schichten 
gruppe von Crosaro, Denkschriften der k. Akademie der wissenschaften, Wien, 
vol. 29, p. 260, pi. 29, fig. 4. 
1891. Scrupocellaria gracilis Waters, North Italian Bryozoa, Quarterly Journal Geological 
Society, London, vol. 47, p. 6, pi. 1, figs. 12, 13. 
Comparison of our photograph with the figures published by Waters shows 
I he great similarity of the American specimens with Scrupocellaria gracilis. The 
dorsal vibraculum is small and longitudinal. The figured segment bears no trace 
of the scutum. At its base are zooecia which have undergone total regeneration. 
