NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
515 
It differs from Gale op sis erinaceus and Galeopsis verrucosa in its much smaller 
and not salient spiramen. 
Occurrence. — Upper Jacksonian (Ocala limestone) : Alachua, Florida (very 
rare). 
TIolotype . — Cat. No. 64163, U.S.N.M. 
Genus SCHIZAROPSIS Canu and Bassler, 1917. 
1917. Schizaropsis Canu and Basslek, Synopsis American Early Tertiary Cheilostomc 
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 pleurocvst placed on a thick olocyst. The spiramen is almost as 
large as the peristomice. 
Genotype. — Schizaropsis convexa Canu and Bassler, 1917. Jacksonian. 
SCHIZAROPSIS CONVEXA Cann and Bassler, 1917. 
Plate 66, figs. 6, 7. 
1917. Schizaropsis convexus Canu and Bassler, Synopsis American Early Tertiary Clieilo- 
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 on each side of the apertura. 
,, , , r/m=0.05 mm. (without rimule) . 
Measurements . — Apertura 7 - 
r \Ia= 0.07 mm. 
r , . (As= 0.35-0.50 mm. 
Zooecia 7 n or , 
lfe=0.30 mm. 
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. 
