NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
437 
olocyst with tubules. The apertura (interior) is formed of a semilunar anter and 
of a concave poster; the peristomice (exterior) is elongated, imbedded , provided 
with a triangular rimule-spiramen. The ovicell is hyperstomial, buried in the distal 
zooecia, globular, salient, decorated with large tremopores; it opens largely into 
the peristomie. The oral avicularium is adjacent to the peristomice and placed 
somewhat obliquely; it is triangular, rather long, and provided with a pivot; the 
beak is turned outward. 
Measurements. 
-Apertura (ha= 0.15 mm. 
(interior) ff<7=0.15 mm. 
„ . rZ 3 =0.90-1.00 mm. 
Zooecia . „ . A 
[te=0.40 mm. 
-u.iT-w.iu mm. 
Peristomice| z ^ =ai8 _ a20mm< 
V aviations. — The zooecial walls are relatively little thickened (figs. 19, 20. 21) ; 
also the exterior aspect is rather constant. The variations observed are principally 
those of the avicularium; it is often long and salient (figs. 14, 15), often short 
(fig. 13), often worn (figs. 17, 18). The tremopores are large, but they are smaller 
when they are more numerous (figs. 16, 18). The zooecia are sometimes bordered 
by a thread (fig. 14) which may become very prominent. 
The tangential Section shows the frontal tremopores. Because of the general 
convexity of the zoarium it is impossible to obtain a preparation which shows all 
of them. In figure 21 the lateral tremopores occur alone and in the middle, the 
subjacent olocyst appears. 
Afi.nities. — This species differs from Enoplostomella rhomboidalis , in its zoa- 
rial form, in the absence of large separating threads between the zooecia, and in 
tiie mucn more globular ovicell. 
It differs from Enoplostomella ligulifera , which is also vinculariform in the 
absence of lateral tongues to the peristomice and in its oral avicularium of much 
less strength. (Lav= 0.25 mm. and not 0.40 mm.) 
Occurrence. — Vicksburgian (“Chimney rock” of Marianna limestone) : One 
mile north of Monroeville, Alabama (verv common). 
Cotypes.— Cat. No. 62594, U.S.N.M. ' 
ENOPLOSTOMELLA LIGULIFERA, new species. 
Plate 90, figs. 17-22. 
Description.- — The zoarium is free, cylindrical, sometimes bifurcated. The 
zooecia are distinct, elongated, fusiform; the frontal is convex, thick, formed of a 
tremocyst with tubules surmounting a thin olocyst with small scattered pores. The 
apertura is very oblique and orbicular; the peristomice is large, elongated, pro- 
vided with a wide, triangular, short rimule-spiramen, garnished laterally with two 
salient, widespread tongues. The ovicell is hyperstomial, globular, salient, gar- 
nished with tremopores; it opens largely into the peristomie. The avicularium is 
very long, transversal, provided with a pivot; the beak is directed outward. 
