80 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
pora catenularia Jameson, should be selected. Waters, 1 however, decided that the 
. . . " 
two were distinct species, but undoubtedly of the same group. We can thus 
logically select M embranipora catenularia as a typical species of the genus Pyripora 
D’Orbigny, 1852. This species is not rare, and the studies which it will receive will 
complete the definition of the genus and delimit the family characters. . 
Mr. Lang was kind enough to write us that Bronn and Roemer in 1851 had 
chosen Escliarina crenulata as the type of Pyripora D’Orbigny, 1847. We would 
say that this species does not conform to the very vague definition of 1847, and that 
as the definition of 1852 cancels that of 1847, the selection of Bronn and Roemer is 
therefore annulled. 
Such an irrational application of the law of priority has led Gregory into a 
paradoxical error. His genus Zonopora D’Orbigny does not contain a single species 
that D’Orbigny himself had classed in it. From this one would infer that the 
celebrated French paleontologist did not know what he was writing about. 
PYRIPORA PARVICELLA, new species. 
Plate 3, fig. 1. 
Description. — The zoarium incrusts shells. The zooecia are arranged in iso- 
lated linear rows; they are small, quite elongated, pyriform, much narrowed in the 
rear; the gymnocyst. is smooth and convex; the opesium is anterior, elliptical, very 
finely crenulated. with a length of a third of the zooecia. 
\Lz=0A5 mm. 
lfe=0.20 mm. 
Afjinities. — This neat little species differs from Pyripora tuberculum Lonsdale, 
1845, in its lesser zooecial length and in the more regular form of its zooecia. 
Several well-preserved specimens have been found. 
Occurrence. — Midwayan (Clayton limestone) : Brunclidge, Alabama (rare). 
Holotype. — Cat. No. 63787, U.S.N.M. 
PYRIPORA TUBERCULUM Lonsdale, 1845. 
Plate 19, fig. 4. 
1845. Hippothoa- tuberculum Lonsdale, Account of twenty-six species of Po'lyparia ob- 
tained from the Eocene Tertiary formations of North America, Quarterly Journal Geo- 
logical Society, London, vol. 1, p. 527. 
1852. Pyripora tuberculum: D’Orbigny, Prodrome paleontologie stratigraphique, vol. 2, p. 396. 
1862. Pyriflustrella tuberculum Gabb and Horn, Monograph of the fossil Polyzoa of the 
Secondary and Tertiary formations of North America, Journal Academy Natural Sciences, 
Philadelphia, ser. 2, vol. 5, p. 163. 
Description. — The zooecia are rounded anteriorly and very much constricted 
posteriorly ; the gymnocyst is convex, more or less striated transversely ; the mural 
rim is broad, tuberculated, divided into two parts by a circular furrow; the 
1 1907. Waters, Notes on some recent bryozoa in D’Orbigny’s collection, Annals and Magazine Natu- 
ral History, ser. 7, vol. 15, p. 11. 
Measurements- 
. [7to=0.16 mm. 
-Opesmm| fo=al0 mm . 
