NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
613 
globular, transverse, smooth. The deep zooecia are entirely hidden; their apertura 
is alone visible. The submarginal zooecia are oblique, oriented; the frontal is very 
convex, smooth, and terminated by a double beak, of which one at least is avicu- 
liferous; there are three small elliptical avicularia with pivot on the frontal; the 
oral avicularium is curved and opens into the locella. The marginal zooecia are 
oriented; the frontal is terminated by two aviculiferous beaks entirely hiding the 
apertura; there is only one avicularium in the vicinity of the apertura; the apertura 
is very oblique, and disposed at the base of the locella. The interzooecial avicu- 
laria are elongated like the beak of a duck; the pivot separates a small pore in 
crossing the subtriangular orifice; the mandible was lodged in two-thirds of a 
calcified area. 
Affinities . — In the interior on the apertura there are two small cardelles sep- 
arating a large anter from a smaller, very concave and broader poster (fig. 24) . 
The apertura is very finely denticulated. 
Some zooecia are perforated in their median portion by a longitudinal tube, 
the external relations of which have not been discovered because of the lack of 
specimens. 
The marginal zooecia much resemble the Cellepora verrucosa Reuss, 1847. The 
present species differs from it in the presence of two oral avicularia opening into 
the locella. 
Occurrence . — Middle Jacksonian (Castle Hayne limestone) : Wilmington, North 
Carolina (very rare). 
Cotypes. — Cat. No. 64221, U.S.N.M. 
ANALYTICAL KEY TO HOLOPORELLA. 
1 
9 
3 
4 
•5 
6 
7 
8 
(The frontal is bordered with areolae 
IThe frontal is entirely smooth (new genus) 
Zoarium discoidal 
Ovicell fissured 
Two or three salient avicularia on frontal 
Long peristomie 
Spines. Oral avicularium on the frontal 
No spines. Oral avicularium disposed laterally on the peristome 
(No oral avicularium or aviculiferous beak on the frontal 
(Avicularium or beak 
rNo large interzooecial avicularia 
(Large interzooecial avicularia 
fZoarium massive, very small zooecia 
(Zoarium large and with hornlike processes; large aviculiferous umbo 
( Avicularium of more than 0.20 mm. in length 
(Avicularium of less than 0.20 mm. in length 
rPedunculated avicularium between the superficial zooecia 
(No salient avicularium 
(Spines. Zoarium free 
(No spines. Zoarium incrusting 
. 2 . 
.3. 
.E. discus. 
. E . Jissurata . 
.E. biro strata. 
.E. peristomaria. 
.E. seposita. 
.E. granulosa. 
.E. crassicollis. 
.4. 
. 6 . 
.5. 
.E. micropora. 
.E. damicornis. 
.E. altirostris. 
.7. 
.E. separata. 
. 8 . 
.E. separata. 
. E. orbiculifera . 
According to the nature of the frontal there are really two distinct genera. We 
have not formed them, because on the fossils not only are the areolae not always 
visible, but also they are often closed. Moreover, our technique was too elementary. 
