FORTH AMERICAN EARLY TERTIARY BRYOZOA. 
753 
Genus TUBULIPORA Lamarck, 1816. 
1816. Tubulipora Lamarck, Historie naturelle des animaux sans vertebres, vol. 2. 
The ovieell is irregular, lobed, spread out between the fascicles. The tubes 
are quite salient, isolated or joined in fascicles, uniserial and irregular. The oecio- 
stome is adjacent to a tube and the oeciopore is directed in a direction contrary to 
that of an apertura. Eleven or 12 tentacles. Gemmation generally peripheral. 
Genotype. — Tubulipora flabellaris Fabricius, 1780. 
Range. — Midwayan-Recent. 
Harmer 1 defines the genus as follows : 
Zoarium with a distinct basal lamina, adnate or erect, beginning as a pyriform or 
flabelliform colony, which may become lobed by the division of the terminal membrane. Lobes 
short and adherent, or longer and dichotomously divided once or more often, sometimes be- 
coming erect. Zooecia with a free, cylindrical, terminal portion; or connate in obliquely trans- 
verse series, in which they are separated by flat septa corresponding with the intersection of 
two cylindrical zooecia. The series are arranged alternately on opposite sides of the axial 
line of the lobe, but the transverse arrangement usually becomes radial in the distal part of 
the fertile lobes. Ovieell, an enlarged zooecium, which extends into the intervals between 
the parallel or radial series. 
Genotype. — Tubulipora liliacea Pallas, 1766. (= Tubulipora serpens authors). 
Canu in 1916 explained why the change of Tubulipora serpens to Tubu- 
lipora liliacea is not acceptable. Moreover, this species is badly chosen as geno- 
type of the genus, for it is the only one which has an idmoneiform zoarium; all 
the other species are more or less flabellatc. We would rather prefer the Tubuli- 
pora flabellaris Fabricius, 1780, very well figured later, as the true genotype. 
It is indeed true that Tubulipora serpens is a Tubulipora. The genus Idmonea 
Lamouroux, 1821, is also quite distinct and is characterized by the form and position 
of its oeciopore. 
TUBULIPORA MIDWAYANICA, new species. 
Plate 107, fig. 1. 
Description. — The zoarium is flabellate, small, free, living on algae. The fas- 
cicles are salient, crowded, uniserial, complete, radiating from the ancestrula. 
The tubes are invisible; the peristome is thin, round or polgonal. 
j Diameter of the peristome 0.08 mm. 
Measurements. — Diameter of the apertura 0.06 mm. 
, 1 Distance between the peristomes 0.10 mm. 
Affinities. — The only specimen found has been figured. The necessities of the 
generic classification oblige us to describe it, but it is difficult to establish its rela- 
tions with the other known species, especially since it lias no ovieell. 
It differs from Tubulipora flabellaris Fabricius, 1780, in its complete and non- 
interrupted lines and in its much shorter tubes. 
Occurrence. — Midwayan (Clayton limestone) : One mile west of Fort Gaines, 
Georgia (very rare). 
Holotype. — Cat. No. 65243, U.S.N.M. 
1 1898. Harmer, On the development of Tubulipora, Quarterly Journal Microscopical Society, n. s, 
vol. 41, p. 99. 
55899— 20— Bull. 106 48 
