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BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 
based on a badly preserved example provided with a cribriform area. In 1902 
Levinsen formed a genus Lobopora for the species having Eschara coscinophora 
Reuss, 1847, for type. In 1904 Canu, not yet having learned of Levinsen’s work, 
formed the genus Cribricella with the same genotype. He added a genus PoriceUa 
for a similar species, but without median avicularium. In 1909 Levinsen abandoned 
his genus Lobopora and classed in the genus Adeonellopsis MacGillivray, 1886. all 
the species provided with stellate ascopores. We adopt his classification because all 
the preceding genera have no different functions and therefore can not be accepted. 
However, Cribricella and PoriceUa may be admitted as artificial subgenera m 
order to facilitate the classification. 
The first subgenus, the group of A. distoma-coscinophora , ought to be the sub- 
ject of special research, for it is much involved. 
Under the name Escliara coscinophora Reuss, 1847, authors have united several 
different species. 
First. Cribricella {Eschara) distoma Rusk, 1878. This species is found living 
in the Atlantic from Madeira to the coasts of Brittany, where Madame Guerin- 
Ganiyet recently found it. 1 
Second. Cribricella { Eschara ) coscinophora Reuss, 1847, refigured by Manzoni 
in 1877. This is a Miocene fossil adorned with a small avicularium, small cribri- 
form area, and very small parietal areolae. 
Third. Cribricella { Eschara ) coscinophora Reuss, 1864, 1866. This is an 
Oligocene species which Canu believed he had rediscovered in the Parisian 
Lutetian and to which he gave the new name of Cribncella punctata. 
Fourth. Cribricella ( Eschara ) coscinophora Stoliczka, 1862. According to 
the excellent figure of the author, this is not Reuss’s species, but is the Cribncella 
(. Adeonellopsis ) ivetherelli Gregory, 1892, and probably also Cribricella {Lobopora) 
coscinophora Canu, 1907. However, this latter is provided with an adventitious 
avicularium on the old zooecia— a peculiarity not mentioned by Gregory or 
Stoliczka. 
The differences between these various species are rather small; in effect they 
depend principally upon the micrometric dimensions. However, they are of real 
value upon serious analysis. As always, the German Oligocene species are the most 
problematic because for a long time we have been unable to obtain any specimens, 
either by purchase or exchange. It may be possible that the Oligocene species are 
identical with the Miocene, as Reuss himself believed, but this is not clearly appar- 
ent from the published figures. 
The known species of this genus, in addition to the genotype, are : 
Adeonellopsis {PoriceUa) maconnica Canu. 1904. Upper Eocene of Tunis. 
Adeonellojpsis {PoriceUa) elongate Canu, 1907. Lutetian of Paris. 
Adeonellopsis obliqua MacGillivray, 1895. Miocene of Australia. 
1 Contributions a l'etude des Bryozoaires des cotes armoricaines, I. Bryozoaires provenant du Hauf 
Fond de la Chapelle et recueilli en 1900 par I’expedition de la Vienne, Travaux du Laboratoire de Zoologie 
de Concarneau, vol. 3, 1911, p. 9, pi. 2, figs. 1, 2. 
