NORTH AMERICAN EARLY TERTIARY BRYOZOA. 515 



It differs from GaJeopsis < r//i</c> us and Galeopsis verrucosa in its much smaller 

 and not salient spiramen. 



Occurrence. Upper Jacksonian (Ocala limestone) : Alachua, Florida (very 

 rare). 



nolotype.G&i. No. 64163, U.S.N.M. 



Genus SCHIZAROPSIS Canu and Bassler, 1917. 



1017. Schizaropsis CANU and BASSI.ER, Synopsis American Early Tertiary Cheilostoine 

 Bryozoa, Bulletin 96, United States National Museum, p. 57. 



The apertura bears a straight proximal border notched by a small rectilinear 

 rimule. The frontal is garnished laterally with areolae; it is formed of a very 

 finely granulated pleurocyst placed on a thick olocyst. The spiramen is almost as 

 large as the peristomice. 



Genotype. ScMsaropsis conrcxa Canu and Bassler, 1917. Jacksonian. 



SCHIZAROPSIS CONVEXA Canu and Bassler, 1917. 

 1'hite 06, figs. 6, 7. 



1917. $chi:aropsis convcacus CANU and BASSLEE, Synopsis American Early Tertiary Olieilo- 

 stome Bryozoa, Bulletin 96, United States National Museum, p. 57, pi. 5, fig. 7. 



Description. The zoarium incrusts oysters; the zooecia are grouped in linear 

 longitudinal lines. The zooecia are distinct, a little elongated, elliptical, or rec- 

 tangular; the frontal is very convex, smooth, or very finely granular, bordered 

 laterally with six large, widely spaced areolae. The apertura is formed of a semilunar 

 anter and of a straight proximal border notched by a small rectilinear rimule. The 

 spiramen is elliptical, transverse, placed on the exterior peristomie, almost as wide 

 as the peristomice. The ovicell is globular, salient, smooth; it is hyperstomial and 

 opens by a very large orifice above the apertura and opposite the spiramen. Two 

 small triangular avicularia are placed' symmetrically 011 each side of the apertura. 



rha=O.Q5mm. (without rimule). 

 Measurements. Apertura L nfr 



\ln~ 0.07mm. 



7:2=0.35-0.50 mm. 

 7 n ori 

 fe=0.30mm. 



Variations. The young zooecia have no superior arch and are deprived of 

 spiramen. On the adult zooecia when the superior arch is not formed the lateral 

 lips of the peristomie limit a rimule-spiramen. The lateral areolae are little visible 

 because of the very large convexity of the frontal; they are quite apparent when 

 the preparation is properly inclined. 



The spiramen is little visible by perspective because it is in a plane almost 

 perpendicular to the zooecial plane. 



Occurrence. Lower Jacksonian (Moodys marl): Jackson, Mississippi (rare). 



Cotypes.Cat. No. 62603. U.S.N.M. 



