NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
345 
STEPHANOSELLA ENTOMOSTOMA Reuss, 1847. 
Plate 85, figs. 19-21. 
1847. Cellepora entomostoma Reuss, Die fossilen Polyparien des Wiener Tertiarbeckens, 
Haidinger’s naturwissensckaftlicke Abliandlungen, vol. 2, p. 92, pi. 11, fig. 7. 
1S64. Lepralia entomostoma Reuss Zur Fauna der deutschen Oberoligocans, Sitznngsbericbte 
der k. Akademie der Wissenschaften. vol. 50, p. 27, pi. 13, fig. 6. 
1874. Lepralia entomostoma Reuss, Die fossilen Bryozoen des Oesterreichisch-Ungarischen 
Miocans, vol. 1, pi. 17, p. 4, fig. 11. 
Measurements. — Aperture 
f 7/<2=0.08 mm. 
I. ?<7=0.05 mm. 
Zooecia 
Lz— 0.32-0.36 mm. 
lz— 0.20 mm. 
Variations. — The frontal is an olocyst absolutely smooth when there are no 
areolae (fig. 21) ; it is covered with small granulations of pleurocystal origin when 
very small, scattered areolae appear. More often there is only an oral avicu- 
Inrium; it is small, elliptical, without pivot on the ordinary zooecia (figs. 19, 20) 
but elongated, thin, with pivot on the ovicelled zooecia; moreover, on the latter 
it changes place, is removed from the aperture and becomes frontal (fig. 21). 
The ovicell is globular, salient, and bears in front a fragile finely ribbed 
callosity of olocystal origin ; it is bordered by a very thick circular collar. The 
aperture of the ovicelled zooecia is larger (la= 0.10 mm. instead of 0. 07 mm.). 
The aperture is oblique, which, on account of perspective, diminishes the length 
of the rimule. 
Affinities. — This species differs from Stephano sella (Schizoporella) biaperta 
Michelin, 1845, living and fossil, in the position of the avicularium, which is always 
placed below the aperture, and in its smaller micrometric dimensions. 
It differs from Stephano sella parvipora in its larger aperture and in the 
avicularium, which is placed below the aperture. 
O ccurrence. — Yicksburgian (Marianna limestone) : West bank Conecuh River, 
Escambia County, Alabama (common) ; Claiborne, Monroe County, Alabama 
(rare) ; 1 mile north of Monroeville, Alabama (very common). 
Geological distribution. — Chattian of Germany (Reuss) and Tortonian of 
Austria-Hungary (Reuss). 
Plesiotypes. — Cat. No. 64269, U.S.N.M. 
Genus LACERNA Jullien, 1888. 
1888. Laoerna Jullien, Mission Scientifique du Cap Horn, p. 48. 
The ovicell is hyperstomial and is provided with a special orifice, which can 
be closed by the operculum for the passage of the eggs. The aperture is arched 
anteriorly; its proximal border is straight, with a small, rounded rimule. The 
aperture and the rimule are surrounded by the same peristome, which is provided 
with spines. There is a vestibular arch. The frontal and the ovicell are formed 
of an olocyst surrounded with areolae, above which an incomplete and granular 
pleurocyst is deposited. 14 tentacles. 
Genotype. — Lacerna hosteensis Jullien, 1888. 
Range.- — Lutetian-Recent. 
