330 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
anterior semilunar portion and of a wide rounded rimule. The ovicell is large, 
somewhat globular, smooth. The zooeciules are small, elliptical, smooth, perforated 
by a very small orifice. 
Affinities. — Smitt, in 1873, identified this species with Trypostega venusta 
Norman, 1864. We can not subscribe to this identification, for the American 
authors do not mention the frontal pores at all. Another part of their description 
corresponds much better to the present species than to Trypostega undulata in 
which the zooecia are very convex. They write as follows : “ Cellules slightly con- 
vex, oval . . .” and “ The oval plain, small cellules, with the mouth ovoid to sub- 
triangular. . . .” They confound the zooeciules (figured) with the ovicells, yet 
they say in the text, that “ the ovarian vesicle is something much broader than 
shown in the figure, sometimes attaining as great a width as the cellule itself.” 
This species differs from Tn/postega undulata in its less Convex frontal, its 
larger micrometric dimensions (Lz, 0.44—0.50 mm. instead of 0.40 mm.), in the 
larger aperture, and in the absence of undulations and frontal gibbosities. 
It differs from Trypostega. venusta Norman, 1864, in its larger micrometric 
dimensions and its smooth frontal, which is not perforated by scattered pores. 
Occurrence.- — Upper Jacksonian (Ocala limestone) : Chipola River, east of 
Marianna, Florida (rare) ; west bank of the Sepulga River, Escambia County, 
Alabama (rare). 
Vicksburgian (Marianna limestone) : Salt Mountain, 5 miles south of Jackson, 
Alabama (rare) ; Murder Creek, east of Castlebury, Alabama (rare) ; near Clai- 
borne, Monroe County, Alabama (rare) ; west bank of Conecuh River, Escambia 
County, Alabama (rare) ; one mile north of Monroeville, Alabama (common) ; 
three miles southeast of Vosburg, Jasper County, Mississippi (rare) ; deep well, 
Escambia County, Alabama (very rare). 
Plesiotypes. — Cat. Nos. 64043-64045, U.S.N.M. 
1851. Mollia tuberculcita D’Orbigny, Paleontologie Frangaise, Description des aniinaux in- 
vertebres, Terrain cretacd, vol. 5, Bi’yozoaires, p. 3SS, not figured; see Waters, 
Annals Magazine Natural History, ser. 7, vol. 15, p. 6. 
1864. Lepralia venusta Norman, On undescribed British Polyzoa, Annals Magazine Natural 
History, ser. 3, vol. 13, p. 84, pi. 10, figs. 2, 3. 
1873. Gemellipora glabra, form striatula Smitt, Floridan Bryozoa? pt. 2, Kongl. Svenska 
Yetenskaps-Akademiens Handlingar, vol. 11, No. 4, p. 37, pi. 11, p. 207. 
1880. Schizoporella venusta Hincks, British Marine Polyzoa, p. 276. pi. 30, figs. 6, 7. 
1882. Lepralia striatula MacGillivray, Descriptions of new or little known Polyzoa, Trans- 
actions of the Royal Society of Victoria, pt. 2, vol. 19, p. 134, pi. 3, fig. 17. 
1885. Schizoporella striatula Waters, Cheilostomatous Bryozoa from Aldinga and the River 
Murray Cliffs, South Australia, Quarterly Journal of the Geological Society of Lon- 
don, vol. 41, p. 301. 
Measurements . — Aperture 
A«.=0.08-0.10 mm. 
la= 0.06-0.08 mm. 
TRYPOSTEGA VENUSTA Norman, 18G4. 
Plate S5, figs. 15, 16. 
