, NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
399 
1880, but it is impossible to confuse them, as these genera have quite different 
characters. Catenicella possesses gonoecia; Urceolipora is provided with an endo- 
zooecial ovicell and Ichthyaria has no avicularia. 
HIPPOZEUGOSELLA TEGES Canu and Basslcr, 1917. 
Plate 53, figs. 1-6. 
1917. Hippozeugosella teges Canu and Bassler, Synopsis of American Early Tertiary 
Cheilostome Bryozoa, Bulletin 96, United States National Museum, p. 42, pi. 4, fig. 5. 
Description. — The zoarium is free, erect, unilamellar, formed of two longi- 
tudinal rows of zooecia ; on the dorsal the zooecia are convex, alternate, and they 
have the aspect of a mat. The zooecia are distinct, elongated, hexagonal ; the 
frontal is convex and formed of a tremocyst with very small pores. The aperture 
is orbicular and formed of a large anter and with a smaller poster separated by 
two very small cardelles; the peristome is complete, broad, and infundibuliform. 
On the peristome itself and near the zoarial axis, there is a small round avicularium 
provided with a pivot. Ovicell? 
, . [ha= 0.11mm. „ . rZs=0.70-0.T5 mm. 
Measurements. — Aperture 1 7 , , Zooecia 7 
1 [to=0.11mm. |te=0i5 mm. 
Affinities. — The frontal pores are very small and are easily filled up. The 
frontal and the dorsal are covered with very small granulations. The formation 
of the branches is effected by the union of two zooecia arising from t wo superposed 
zooecia (fig. 4). 
This species differs from Ba.ctridium lxagenowi Reuss, 1847, in the absence of 
a frontal avicularium, in the absence of two peristomial tubercles, and in the absence 
of areolae on the dorsal. 
Waters, 1 in 1891, when studying the species from the Vicentin described the 
aperture as schizoporellidan. We have not exactly verified this form in our Ameri- 
can species. We have discovered two triserial specimens (figs. 5, 6) which are 
perhaps the bases of the zoaria. 
Occurence. — Jacksonian (Zeuglodon zone) : Cocoa post office, Choctaw County, 
Alabama (very rare). 
Upper Jacksonian (Ocala limestone) : Chipola River, east of Marianna. Jack- 
son County, Florida (common). 
Cotypes. — Cat. Nos. 62591, 64099, U.S.N.M. 
HIPPOZEUGOSELLA DISTORTA, new species. 
Plate 52, figs. 19-21. 
Description. — The zoarium is free, subcylindrical ; it is formed of two lamellae, 
back to back with two zooecial rows not united by the lateral zooecia. The zooecia 
are elongated, distinct, fusiform; the frontal is very convex and formed of a 
tremocyst with small pores. The aperture is elliptical, elongated, imbedded; the 
peristome is irregular and formed of three distorted lamellae leaving between them 
1 1891. Waters, North Italian Bryozoa, Quarterly Journal Geological Society, London, vol. 47, p. 7 
