124 SYNOPSIS OF AMERICAN FOSSIL KRACIilOPODA. (hill. 87. 



Beeclieria llall and Clarke, 1893. Propygope Bittuer, 1890. 



Liothyiina CELlert, 1887. 



lOpitliyris Deslongcbainps, 1862 (not 



King, 1848), 

 Gryphus Megerle, 1811 (not Brisson, 



1760). 

 Liothyris Douville, 1880 (not Coniad, 

 1875). 

 Terebratuliua d'(~rbigny, 1847. 

 IDisculiua DesloDgchamps, 1884. 



Ueiuiptycbiiia Waageii, 1882. 

 Rliu'tina Waageii, 1882. 

 Terebratula Klein, 1753. 



Terebratula Llhwyd, 1699. 



Saeculus Llhwyd, 1699. 



Lanipas ^rensolien, 1787. 



Terel)ratnlanns Dnmeril, 1806. 



Nucleata Qneustedt, 1871 . 



Muscnlus Quenstedt, 1871 (not Klein, 

 1753). 



Dipbyites Scbroter, 1799. 



Pngites de Hann, 1833. 



Antinomia Catnllo, 1850. 



2a^. Subfamily DiscoliiNvE Beecber, 1893. 



Discollidae Fiscbei- and Qilblert, 1892. 



Terebratulida? with the "loop short and contiuiious with the cirrated 

 edge of the lophophore. No coiled median arm'' (Beecher). 



Discolia Fischer and (Ehlert, 1890. fAgulhasia King, 1871. 

 Euealathis Fischer and Q^hlert, 

 1890. I 



Section B. TEREBBATELLA. 



Terebratulacea with the loop supported by a median dorsal septum 

 throughout life, or only in the younger stages. Brachial cirri directed 

 inward during larval stages. This section has two phyla having a com- 

 mon origin now geographically separated in two provinces, one austral, 

 the other boreal. 



1. Family TEREBEATELLID^ King, 1850 (emend Beecher, 1893). 

 Waldheimida' Douville, 1880; Waldbeimiiu;i' Waagen, 1882. 



Terebratulacea with the "loop in the higher genera composed of two 

 primary and two secondary lamelhv, passing through a series of distinct 

 metamorphoses while attached to a dorsal septum" (Beecher). 



1. Subfamily Tropidoleptiin^e Schuchert, 1896. ' 



Terebratellidiv with the loop consisting of two slender descending 

 branches, uniting with a high, vertical septum. Apparently the 

 ancestral stock for the Terebratellida^. 



Tropidoleptus Hall, 1859. 



» Test-book of Paleontology, by Zittel and Eastmau, 1896, p. 330. 



