466 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
V aviations and affinities. — The young zooeeia (fig. 21) have thin margins and 
the ovicell is quite salient. The old zooeeia are covered by the pleurocyst; the 
areolae are larger and the ovicell is immersed in the cap (fig. 23). 
The present species differs from Smittina telum in which the zoarium is 
identical, in the absence of a large frontal avicularium and in the presence of a 
lyrula. 
It differs from Smittina reticuloides , which is also provided with large 
costules, in its much larger micrometric dimensions and in the absence of the oral 
avicularium. 
Occurrence. — Vicksburgian (Glenclon member of Marianna limestone) : West 
bank Conecuh River, Escambia County. Alabama (rare). 
Cotypes. — Cat. No. 64298, U.S.N.M. 
SMITTINA AMPLA, new species. 
Plate 93, figs. 10-16. 
Description. — The zoarium is an Eschara in which the tw T o lamellae, back to 
back, are inseparable. The zooeeia are large , distinct, elongated, elliptical ; the 
frontal is very convex and bordered with a line of large triangular areolae; it is 
formed of an olocyst partially perforated with large lateral pores, surmounted by 
a pleurocyst with large interareolar costules. The apertura (interior) is elliptical, 
transverse and bears a small lyrula, cvlindical and salient; the peristome is thin, 
sharp, little salient, garnished with 4 thin spines; the peristomice is elongated ellip- 
tical or oval. The ovicell is large, globular, salient, carinated: it is formed of a 
smooth area surrounded by a salient collar; it covers much of the peristomice 
which it deforms; it is hyperstomial and opens largely into the peristomie. The 
oral avicularium is small, elliptical, very salient, deforming inferiorly the peri- 
stomice. At the side of the apertura there is often a large lateral avicularium, 
with pivot and a spatulate beak directed towards the top. 
Measurements. — Apertura 
[ ha=0.18 mm. 
| 7a=0.20 mm. 
Zooeeia 
ZA=0.90-1.00 mm. 
lz= 0.22 mm. 
Peristomice 
|A/>e=0.30mm. 
\lpe— 0.22 mm. 
Variations. — The lyrula. seen from the interior (fig. 14) appears short and 
cylindrical; on the exterior (fig. 11) it appears flat and broad. But the interest of 
this species is in its calcification (fig. 14) ; there is here as it were a juxtaposition 
of the olocyst and of a tremocyst ; the latter only exists at the base of the zooeeia; 
on the sides the line of the areolae become unique. This augmentation of the 
number of the areolae appears to correspond with a more intense pleurocystal cal- 
cification. There appears therefore to be a relationship between the tremopores 
and the areolae, both allowing the buds of the endocyst and the mesenchymatous 
fibers to pass at the same time. 
The vertical section (fig. 16) shows how the apertura is oblique on the zooecial 
plane. 
