530 
BULLETIN 106, UNITED STATES NATIONAL MUSEUM. 
Variations. — The apertura of the ovicelled zooecia is twice as large 
(?a=0.40 mm.). 
In this species, as in the preceding Cheilopora , many of the apertures are 
closed by a smooth, calcareous lamella. We have examined this lamella in the 
interior; it is there quite distinctly visible, placed at the middle of the peristomie; 
it is not in direct continuity with the olocyst. We do not think that it represents 
a calcareous operculum, but it is probably the closure of the diseased zooecia 
which have lost their polypide. This is evidently only a hypothesis. 
We can not affirm that the oral avicularia are true avicularia, for certain 
ones among them have much resemblance to the auriculate vibracula. 
Affinities. — This species much resembles Cheilopora saillans , but differs from 
it in its quite manifestly transverse apertura. 
It differs from Cheilopora transversoides in its nonsymmetrical apertura, in 
its larger micrometric dimensions, and in the very large apertura of its ovicelled 
zooecia. 
Occurrence. — Middle Jacksonian: Wilmington, North Carolina (common); 
near Lenuds Ferry, South Carolina (rare). 
Holotype. — Cat. No. 64179, U.S.N.M. 
CHEILOPORA TRANSVERSOIDES, new species. 
Plate 6S, figs. 6-8. 
Description. — The zoarium is free, bilamellar, formed of two lamellae, back 
to back, and inseparable. The zooecia are distinct, elongated, lozenge-shaped, or 
ogival, separated by a salient thread, wide and variable ; the frontal is convex and 
formed of a tremocyst with numerous pores placed on an olocyst finely perforated 
with pores corresponding to the tremopores. The apertura is transverse, elliptical, 
symmetrical; the anter is perceptibly equal to the poster; there are two strong 
median cardelles. The ovicell is endozooecial, small, little salient, convex, smooth. 
The two oral avicularia are small, suborbicular, little salient. 
^ . fZs= 0.90-1. 00 mm. 
^OO0Clcl , j A ~ A A w A 
[fo=0.60-0. ( 0 mm. 
Variations. — The apertura of the ovicelled zooecia is identical with the apertura 
of the ordinary zooecia. 
In the interior we have observed that the two cardelles are only the extremities 
of two condyles, supported on the zooecial walls. The two dietellae are also very 
constant. The zooecial walls are very thin. 
Affinities. — This species differs from Cheilopora transversa in its symmetrical 
apertura, in its smooth and much smaller ovicell, and in its smaller micrometric 
dimensions. 
It differs from Cheilopora saillans in its transverse and not suborbicular aper- 
tura, and in its ovicells with small orifice. 
,, . (Aa=0.14— 0.18 mm. 
Measurements . — Apertura \ , 
1 1 7a=0.18-0.24 mm. 
