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. 



. fZs=0.44-0.50 mm. 

 Zooecia |fe=0.26-0.30mm. 



Affinities. Smitt, in 1873, identified this species with T.rypostega 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 Tri/postega undulata in its less convex frontal, its 

 larger micrometric dimensions (Z0, 0.440.50 mm. instead of 0.40 mm.), in the 

 larger aperture, and in the absence of undulations and frontal gibbosities. 



It differs from Trypo.^te.ga- 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 Eiver, 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 Eiver. 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). 



PUsiotypes.Csti. Nos. 64043-64045, U.S.N.M. 



TRYPOSTEGA VENUSTA Norman, 1864. 



Plate So, figs. 15, 16. 



1851. Mollla tubcrculata D'ORBIGNT, Paleontologie Frangaise, Description des animaux in- 



vertebr^s, Terrain eretnce', vol. 5, Bryozoaires, p. 3SS, not figured; see Waters, 



Annals Magazine Natural History, ser. 7, vol. 15, p. 6. 

 1864. Lepralia venusta NORMAN, On unclescribed British Polyzon, Annals Magazine Natural 



History, ser. 3, vol. 13, p. 84, pi. 10, figs. 2, 3. 

 1873. Gemelllpora glalira, form stria{ula SMITT, Floridan Bryozoa, pt. 2, Kongl. Svenska 



Vetenskaps-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 MACGILLIVBAT, 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. SchisoporeUa striatula WATEES, Cheilostomatous Bryozoa from AJdinga and the River 



Murray Cliffs, South Australia, Quarterly Journal of the Geological Society of Lon- 



don, vol. 41, p. 301. 



