KORTH AMERICAN L.A.TER TERTIARY AND QUATERNARY BRYOZOA. 95 



Genus TRYPOSTEGA Levinsen, 1909. 



(For description, see Bulletin 106, U. S. National Museum, p. 327.) 



TRYPOSTEGA VENUSTA Norman, 1864. 



Plate 16, fig. 1. 



1920. Trypostega venusta Canu and Bassler, Monograph North American Early Tertiary Bryozoa, 

 Bulletin 106, U. S. National Museum, p. 330 p. 85, figs. 15, 16 (bibliography and descrip- 

 tion.). 



The earliest appearance of this recent species in the Tertiary rocks of America 

 is in the Vicksbiu-gian of Mississippi and Alabama, where it is quite rare. The 

 Miocene deposits of North Carolina have furnished a very few specimens which 

 differ in no appreciable respect from the typical form. 



Occurrence. — Miocene: (Duplin marl) Wilmington, North Carolina (very rare). 

 Miocene (Yorktown formation) : 1 mile west of Fort Nonsense, Gloucester Coimty, 

 Virginia (rare). 



Geological distribution. — Miocene of Austraha (Waters); Vicksburgian of the 

 United States (Canu and Bassler). 



Habitat. — Eastern Atlantic: English Channel, Madeira, Azores, Cape Verde 

 Islands. Pacific: Lifu, Loyalty Island, Torres Straits. China Sea, Tozar Bank 

 (43 meters). Indian Ocean: Saya de Malha (46-202 meters); Mauritius; Wasin, 

 British East Africa (162 meters). 



Plesiotype.— Cat. No. 68534, U.S.N.M. 



Family ESCHARELLIDAE, Levinsen, 1909. 



Group , SCHIZOPORELLAE Canu and Bassler, 1917. 



Genus SCHIZOPORELLA Hincks, 1880. 



As employed in our Monograph on the North American Early Tertiary Bryozoa, 

 ScMzoporella is retained for species showing no ovicell and which therefore can not 

 be grouped in their proper place in the Schizoporellae. 



SCHIZOPORELLA MAGNIPOROSA, new species. 



Plate 45, figs. 1, 2. 



Description. — The zoarium incrusts sponges. The zooecia are distinct, sepa- 

 rated by a furrow, irregularly hexagonal; the frontal is little convex, porous, per- 

 forated by large, scattered tremopores. The apertura is formed of a semicircular, 

 anter and of a wide rounded rimule. Near the apertura there are one or two small 

 setiform avicularia. 



-,, . L . \ha = 0.18 xmn. „ • fZ-2 = 0.65 mm. 



Measurements. — Apertura , ^ ,„ Zooecia , „ ..^ „ ^^ 



^ lta = 0.12mm. [ i3 = 0.50-0.55 mm. 



Affinities. — Only the figured specimens have been found, and as they are incom- 

 plete and bear no ovicell it is impossible as yet to classify the species generically. 

 The presence of small, oral, vibraculoid avicularia seems to indicate that this species 

 belongs in reality to the genus Mastigophora. 



The ancestrular zooecia are much smaller. The ancestrula bears a large ellip- 

 tical aperture occupying almost all its frontal. 



