Hemiptycbina Waageii, 1882. 

 Rli:v'tiiui Waiigeii, 18S2. 

 Terebratula Klein, 1753. 



TerebnituU Llliwyd, IfiOi). 



Saccnlus LUiwyd, IGUO. 



Lampas Mensfhen, 1787. 



Terehratularius IJmuoiil, 180(5. 



124 SYNOPSIS OF AMERICAN FOSSIL BRACHIOPODA. [biu.sv. 



Beecheria Hall and Clarke, 1893. Piopygope liittner, 1890. 



Liothyriiia O^^lilert, 18S7. 



]''>l)itliyris l)c!sl()iiji;cliani))S, lSfi2 (not 



King, 1818). 

 Gryphue Mogcrh", ISU (not, Biisson, 



1760). 

 Liothyris Don villi', 1880 (not Conrad, 

 187.5). 

 Nucleata Qneustedt, 1871. Terebratuliua d'Crbigny, 1817. 



Musculns Quenatedt, 1871 (not Klein, IDisculilUl Desloilgchamps, 1884. 



1753). 

 Diphyites Scbroter, 1799. 

 Pngites de Hann, 1833. 

 Antinoniia Catullo, 1850. 



2a''. Subfamily Discoliin^ Beecber, 1893. 



Discoliidse Fischer and (Khlert, 1892. 



Terebratulidfp with the "loop short and continuous with, the cirrated 

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



Discolia Fischer and (Ehlert,1890. ?Agulhasia King, 1871. 

 Eucalathis Fischer and ffihlert, 

 1890. I 



Section B. TEUEBRATELLA. 



Terebratulacea with the loop supported by a median dorsal septum 

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

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

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

 the other boreal. 



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



Waldheimid.T Douvillo, 1880; Waldheimiiii:.' Waagen, 1882. 



Tei'ebratulacea with the "loop in the higher genera composed of two 

 primary and two secondary lamella', passing through a series of distinct 

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



1. Subfamily TROPiDOLEPTiiN.yE Schuchert, 189G. ' 



Terebratellida' with the loop consisting of tvo slender descending 

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

 ancestral stock for the Terebratellida'. 



Tropidoleptus Hall, 1859. 



" Text-book of Paleontology, by Zittel and Eastman, 1896, p. 330. 



