340 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
SCHIZOPODRELLA LINEA Lonsdale, 1845. 
Plate 45, figs. 10-18. 
1S45. Eschara linea Lonsdale, Account of twenty-six species of Polyparia obtained from 
the Eocene Tertiary formation of North America, Quarterly Journal Geological 
Society London, vol. 1, p. 530, fig. 
1S62. Escliarinella ? linea Gabb and Hokn, Monograph of the fossil Polyzoa of the Sec- 
ondary and Tertiary formations of North America, Journal of the Academy of 
Natural Sciences of Philadelphia, ser. 2, vol. 5, p. 140. 
Description. — The zoarium is free, bilamellar; the two lamellae are insepar- 
able. The zooecia are large, elongated, distinct, elliptical; the frontal is convex 
and formed by a thick tremocyst closely united with a very thin inner olocyst, 
the interior of which is very finely perforated. The aperture is semilunar; the 
proximal border is a little concave and bears a narrow rimule. The hyperstomial 
ovicell is salient, globular and smooth. Two small avicularia are symmetrically 
disposed on each border of the aperture; they have a fragile pivot; the beak is 
directed toward the median zooecial axis. 
,, , . \ha=0.15 mm. (including rimule). 
Measurements. — Aperture;, . , - 
1 [/a=0.12mm. 
„ . \ Zs=0. 75-0.90 mm. 
Zooecia 7 n 
[lz= 0.45-0. 65 mm. 
Variations. — There are some zooecia which are narrow (fig. 12), some wide 
(fig. 13), and others very irregular. Often the zooecia are surrounded by a 
prominent thread (fig. 14). The ovicell is always smooth. This is a peculiarity 
which is very rare in the brvozoa, as the ovicell and the frontal are generally of 
the same nature. The small oral avicularia are very constant; sometimes there 
is one of them which is abortive (figs. 13, 14) ; the pivot (fig. 14) is very fragile 
and often missing on the fossils. 
The interior is furnished with a thin perforated olocyst (fig. 17). Upon 
rubbing away the interior it may be noted that the tremopores are bound together 
by a system of small canals radiating from the median axis of the zooecia. Their 
intersection with the calcareous deposit over the tremopores form reticulations 
visible in tangential sections (fig. 16). The tremopores are funnel shaped and are 
much larger on the exterior than on the interior. 
On account of the size of its fronds this is an easily recognized brvozoan. 
Affinities.- — This species is very close to Schizopodretta unicornis Johnston, 
1847, but differs in its smaller, less prominent avicularia, which are turned toward 
the interior of the aperture and not toward the exterior of the zooecia. 
It differs from Schizopodretta viminea Lonsdale, 1845, in its wider zooecia, 
and its two symmetrical avicularia. 
It differs from Schizopodretta marginata in its micrometric dimensions which 
are twice as large, and in the presence of the two oral avicularia. 
Occurrence. — Middle Jacksonian: Type-locality, Eutaw Springs. South Caro- 
lina (very common) ; near Lenuds Ferry, South Carolina (abundant) ; Wilming- 
ton, North Carolina (rare). 
Plesiotypes. — Cat. No. 64052, U.S.N.M. 
