NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
369 
Affinities.- — The form of the aperture is rather indeterminate; it is impossible 
to say whether this species belongs to the Schizoporellae or to the Hippoporae. 
It resembles for this reason Cellaria schreibersi Reuss, 1869, of the Priabonian, 
but differs from it in the form of its zooecia, which are very thin in the posterior, 
in their great length, and in its incomplete tremoevst. 
It differs from Tetraplaria tuberculata. not only in the form of its orifice, but 
in the replacement of the two lateral tubercles by two small avicularia. 
0 ccurrence .- — Middle Jack- 
sonian: Baldock, Barnwell County, 
South Carolina (rare). 
Cotypes. — Cat. No. 64071,. 
U.S.N.M. 
Genus GEMELLIPORA Smitt, 1872. 
1872. Gemellipora Smitt, Floridan 
Bryozoa, pt. 1, Kongl. Svenska 
Vetenskaps-Akademiens Hand- 
lingar, vol. 10, No. 11, p. 35. 
The opercula are subtriangu- 
lar with two small lateral projec- 
tions, corresponding with two small 
lateral teeth in the apertura; the 
muscular attachment is close to the 
side of the operculum. The aper- 
tura of the ovicelligerous zooecia 
differs in shape from that of the 
ordinary zooecia, in most species be- 
ing wider with a flatter sinus. 
(After Waters, 1904.) 
Genotype. — Gemellipora glabra 
Smitt, 1872. 
Range. — Miocene-Recent. 
This genus requires further ex- 
amination. 
The recent species are : 
Gemellipora ( Schizoporella ) 
triangula Hincks, 1881. 
Gemellipora ( Lepralia ) arrogata Waters, 1879. 
Gemellipora ( Schizoporella ) lata MacGillivray, 1882. 
Gemellipora glabra Smitt, 1872. 
Gemellipora protusa Thornelv, 1905. 
The fossil species are: 
Gemellipora elegantissima MacGillivray, 1904. 
55899 — 20 — Bull. 106 24 
Fig. 111. — Genus Gemellipora Smitt, 1872. 
A. Gemellipora glabra Smitt, 1872. Zoarium, natural 
size, and zooecia, enlarged. (After Smitt, 1872.) 
B-D. Gemellipora protusa Thornely, 1905. B. Ovi- 
celled zooecia, X 25. 0. Interior of a zooecium, show- 
ing the oral aperture, X 85. D. Operculum, X 85. 
(B-D after Waters, 1913.) 
E. Gemellipora triangula Hincks, 1881. Operculum, 
X 85. (After Waters, 1887.) 
F. Gemellipora arrogata Waters, 1879. Operculum, 
X 85. (xlfter Waters, 1904.) 
