NORTH AMERICAN EARLY TERTIARY BRYOZOA. 
143 
of Smitt. As the ovicell was not figured, we can not compare it with the species 
of Waters. 
Manzoni in 1875 1 thought also that he had found D’Orbigny’s species in the 
Plaisancian sands of Castrocaro, in Italy. His figure is very similar to that of 
Smitt, 1872, although it will be difficult to get an exact idea of the ovicell from it. 
In 1893, Neviani, 2 revising the Manzoni collection, stated that Membranipora 
irregularis , M. catenularia , and M. lineata of this author form one and the same 
species, all appearing to have interzooecial avicularia. Under these conditions it is 
evident that the Manzoni specie's is different from that of D'Orbigny and also 
of Smitt. The paleontologist who rediscovers it will have to rename it. 
Habitat . — Pourtales has dredged this species off Florida to a depth of 97 
meters. Osburn has noted it off the Tortugas Islands from 13 to 15 meters. 
It creeps over shells and Nullipores. 
Alderina imbellis Ilincks, 1860, is a very rare species. It inhabits the deep 
waters off England (Hinck. 1880), Denmark (Levinsen, 1894). and Norway (Nor- 
man, 1879). 
ALDERINA? NODULOSA, new species. 
Plate 9, fig. 10. 
Description— The zoarium is free, unilamellar, creeping over algae. The 
zooecia are elongated, distinct, oval, bearing interiorly one to two projecting nod- 
ules; the mural rim is thin at the top, much enlarged below, curved, delicately 
decorated with radially arranged granules. The opesium is oval, finely crenulated. 
The ovicell is hyperstomial and never closed by the operculum, salient, globular, 
elongated. The distal septula may be replaced by three smaller septulae. The 
first pair of lateral septulae is very large; the two other pairs of lateral septulae 
are smaller and may each be replaced by two smaller ones. This arrangement of 
the septulae is visible exteriorly. 
mm. 
mm. 
„ . (£s=0.45 (2 nodules)-0.62 mm. (1 nodule). 
Zooecia , A OA AOK 
[lz= 0.30-0.35 mm. 
Affinities . — This elegant species is quite remarkable on account of its plainly 
visible septular arrangement. A large septula is sometimes, without any apparent 
reason, replaced by two or three smaller ones closely arranged. The long zooecium 
with a single inferior nodule appears to be primoserial. 
On account of its nodules and its external aspect, this species somewhat 
resembles Alderina solidula Hincks, 1860, in which, however, the septular arrange- 
ment is binary. Its arrangement of the septulae in threes would suggest its position 
in the genus Caidoramphus Norman, 1903, but the ovicells of the species of this 
genus are either unknown or endozooecial. The septular arrangement and the 
1 1875. Manzoni, I. Briozoi del Pliocene antico di Castrocaro, Bologna, p. 10, pi. 1, fig. 5. 
2 1893. Neviani, Seconda contribuzione alia conoscenza del Briozoi fossili italiani, Bollettino della 
Society geologica italiana, vol. 13, p. 9. 
M easurements- 
. |Ao=0.32-0.35 
-Opesiaj ^ =a20 _ a25 
