NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
477 
salient and placed eccentrically; 18 tentacles. The oral glands are much devel- 
oped. 
Genotype. — Rhamphostomella costata Lorenz, 1886. 
Range. — Priabonian — Recent. 
The only known fossil species is Rhamphostomella hrendolensis Waters. 1891, 
from the Priabonian of Vicentin. 
RHAMPHOSTOMELLA SIMPLEX, new species. 
Plate 8, figs. 11, 12. 
Description. — The zoarium incrusts shells. The zooecia are little distinct; the 
frontal is convex and formed of a pleurocvst very finely granulated. The apertura 
is oblique, imbedded, hidden; it bears a very small lyrula. The peristome bears 
two spines. The ovicell is hyperstomial, placed on the distal zooecia; it. opens 
largely above the apertura and in front, of the avicularium; it is formed of an area 
with very fine pores surrounded bv a scarcely distinct collar. The avicularium is 
enormous, quite salient above the apertura; it is always placed obliquely and opens 
at the side of the apertura. The ancestrula is a small membraniporoid zooecium. 
M easurements. — Zooecia 
\Lz= 0.30 mm. 
=0.20 mm. 
Affinities. — This species is rather difficult to study because of its small dimen- 
sions. Our specimens are well preserved, and at an enlargement of 40 diameters 
they show very clearly the essential characters of Rhamphostomella in their more 
simple and more regular manifestations. The areolae are very rarely visible be- 
cause of their very small dimensions. 
Rhamphostomella simplex differs from Rhamphostomella convexa in its indis- 
tinct zooecia and in the opening of the avicularium which is invisible exteriorly 
and turned toward the apertura. 
It differs from Rhamphostomella hrendolensis in the absence of the large 
frontal avicularium. 
O ccurrence. — Wilcoxian (Bashi formation) : Woods Bluff. Alabama (rare) . 
Cotypes. — Cat. No. 63829, U.S.N.M. 
RHAMPHOSTOMELLA HRENDOLENSIS Waters, 1891, Tar. AMERICANA, new variety. 
Plate 62, fig. 11. 
1S91. Rhamphostomella hrendolensis Waters, North Italian Bryozoa, Quarterly Journal 
Geological Society London, vol. 47, p. 23, pi. 3, figs. 10, 11. 
Description. — The zoarium incrusts shells. The zooecia are little distinct, 
elongated; the frontal is convex and formed of an irregularly and finely granu- 
lated pleurocyst. It has no peristome; the peristomice bears an asymmetrical sinus 
placed between two very salient avicularia of which one is always larger than 
the other; the apertura is oblique, deep, hidden; the lyrula is flat and rather long. 
The ovicell is imbedded in the distal zooecia; it is little salient and smooth. On the 
