NORTH AMERICAN EARLY TERTIARY BRYOZOA. 399 



1880, but it is impossible to confuse them, as these genera have quite different 

 characters. Catenicella possesses gonoccia; 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. HippozcugoseUa tegcs CANU and BASSLKB, 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? 



fAa=0.11mm. . rZs=0. 70-0.75 mm. 



Measurements. Aperture (, _ ., Zooecia {, _ . 



lZffl=0.11mm. 1^=0.45 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 two superposed 

 zooecia (fig. 4). 



This species differs from Bactridium liagenowi Eeuss, 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. 



Occurrence. 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.CvA. 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. 



