NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
225 
Genus SMITTIPORA Jullien, 1881. 
1881. Smittipora Jullien, Note sur une nouvelle division des Bryozoaires Cheilostomes, 
Bulletin Societe Zoologique de France, vol. 6, p. 14. 
The cryptocyst which is deep and concave, exhibits three facets of wliich 
the two lateral ones are formed by the mural rim ; the two lateral furrows which 
separate the mural rim from the crvptocyst are constant. The mandible of the 
onychocellarium is bimembranous ; 
the onychocellarium and its opesium 
are little different from the zooecia. 
Genotype. — Smittipora ( Vincu - 
laria) abyssicola Smitt, 1873. 
Range . — Senonian — Eecent. 
Historical. — It is not certain that 
the European Cretaceous species 
classified by Jullien in this genus 
really belong to the group of Vincu- 
laria abyssicola Smitt. To the best of 
our knowledge the ovicells have never 
been observed on the fossil forms, and 
Smitt’s species has not yet been re- 
discovered. We have been unable to 
make any new observations on the 
specimens studied from the Midwayan 
which are of the type observed in the 
European Cretaceous. We are there- 
fore obliged to follow Jullien’s classi- 
fication as Canu did in 1900. 1 
Neither Gabb and Horn in 1862 
nor Ulrich and Bassler in 1907 have 
intimated the existence of Smittipora in the American Cretaceous. If this be con- 
firmed, it will be necessary to admit that at the beginning of the Eocene a change 
occurred in the direction of the Atlantic marine currents. 
Fig. 59. — Genus Smittipora Jullien, 1881. 
A-C. Smittipora ( Vincularia) abyssicola Smitt, 1872. 
A. Zoarium in the vincularian method of growth. B, 
C. Incrusting zoaria. (After Smitt, 1872, and Hincks, 
1881.) cry, cryptocyst; mb, mandible; op, opesium; 
r) channel of the cryptocyst. 
SMITTIPORA MIDWAYANICA, new species. 
Plate 4, figs. 16-19. 
Description.- — The zoarium is vincular, articulated ( ? ) , formed of cylindrical 
segments containing eight longitudinal series of zooecia. The zooecia are much 
elongated, hexagonal, confluent through their mural rims; the cryptocyst is deep, 
very narrow, as long as the opesium, little distinct from the mural rim. The 
opesium is elliptical. 
Measurements.^- Opesium 
j ko=0. 16 mm. 
lZo=0.08 mm. 
Zooecium 
ZA=0.34 mm. 
Is— 0.16 mm. 
1 Canu, Revision des Bryozoaires du Crdtacd figures par D’Orbigny, Bulletin Socidte Gdologique de 
France, ser. 3, vol. 28, p. 407. 
55899— 19— Bull. 106 15 
