564 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 Poricella 

 for a similar species, but without median -avicularium. In 1909 Levinsen abandoned 

 his genus Lobopora and classed in the genus AdeoneTlopsis MacGillivray, 1886. all 

 the species provided with stellate ascopores. We adopt Ms 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 in 

 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 Eschara coscinophora Reuss, 1847. authors have united several 

 different species. 



First. Cribricella (Eschara} distoma Busk. 1878. This species is found living 

 in the Atlantic from Madeira to the coasts of Brittany, where Madame Guerin- 

 Ganivet 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 Cribricella puncta.ta. 



Fourth. Cribricella (Eschara} coscinophora Stoliczka, 1862. -According to 

 the excellent figure of the author, this is not Reuss's species, but is the Cribricella 

 (Adeonellopsis} loetherelli Gregory, 1892, and probably also Cribricella (Lobopora) 

 coscinophora Canu. 1907. However, this latter is provided with an adventitious 

 avicularium on the old zooecin 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 ( Poricella) maconnica C'anu. 1904. Upper Eocene of Tunis. 



Adeonellopsis (Poricella} elongata Canu, 1907. Lutetian of Paris. 



Adeonellopsis obliqua MacGillivray, 1895. Miocene of Australia. 



1 Contributions a l'6tude des Bryozoaires des cotes armoricnines, I. Bryozoaires provenant du Haut 

 Fond de la Chapelle et recueilli eu 1900 par 1'expedition de la Viennc, Travaux du Laboratoire de Zoologie 

 de Concarneau, vol. 3, 1911, p. 9, pi. 2, figs. 1, 2. 



