TABLE OF CLASSIFICATION. 



CLASS BRACHIOPODA. 



Paterina,* Beecher, 1891. 



Sub-class INARTICULATA, Huxley; LYOPOMATA, Owen. 

 Order Mesocaulia, or Lingulacea, Waagen. 



Family OBOLID^, King. 



Obolus, von Eichwald, 1829. Obolella, Billings, 1861. 



Ungula, Pander, 1830. Discellomus, Hall, 1871. 



Ungulites, Bronn, 1848. Elkania, Ford, 1886. 

 Aulonotreta, Kutorga, 1848. Billingsia, Ford, 1886. 



Acritis, Volborth, 1869. Botsfordia, Matthew, 1893. 



ScHiMiDTiA, Volborth, 1869. Neobolus, Waagen, 1885. 



Mickwitzia, Schmidt, 1888. Monobolina, Salter, 1865. 

 Spondylobolus, McCoy, 1852. 



Family LINGVLIDJE, Gray. 



LiNGULA, Bruguiere, 1792. Leptobolus, Hall, 1871. 



Pharetra, Bolten, 1798. Glossina, Phillips, 1848. 



Lingularius, Dumeril, 1806. Dignomia, Hall, 1871. 



* The genus Paterina, i-epreseuting-, according' to our present knowleilge, the fundamental stock or 

 radicle of all the Brachiopods, might be embraced by some of the primiti\-e families, both of the Inarticii- 

 lata and the Articulata. By placing it in this arrangement, outside both the gi-eat sub-classes, it is the 

 purpose to express the fact that the genus belongs as much to one as to the other, and that it is actually 

 beyond the pale of both as it has not assumed the differential characters of either. 



