128 



SYNOPSIS OF AMERICAN FOSSIL liRACHIOPODA. 



3. Family ATHYKID.5^ Phillips, 1S41. 



Nnclf08i>iri(l:i' Davidson, 1882; Koiiinckini(la3 Davidson, 1853. 



Spiriferacea with the bases of the primary lamella' situated between 

 the spiralia, and shar[)ly recurved dorsally at their Junction with the 

 criini. S|)iralia more or less laterally directed. .lugum complete, 

 V-shiiped, with the apex drawn out into a simple, bifurcated, or other- 

 wise moditied process. 



3a. Subfamily Rhynchospibin.e Schuehert, 1804. 

 Retziin:e Waagen, 1883; Retziidie aud Rhyucliospirida; Hall and Clarke, 1895. 



Athyrida^ with the single i)rocess of the jugum commonly recurved, 

 but sometimes bifurcated. Shell structure distinctly punctate. 



Homceospira Hall and Clarke, 1893. 

 Rhynchospira Hall, 1859. 

 Ptychospira Hall and Clarke, 1893. 

 Eumetria Hall, 18G4. 

 Trematospira Hall, 1857. 



Parazyga Hall and Clarke, 1893. 

 Acambona White, 186L». 

 Hustedia Hall and Clarke, 1893. 

 Eetzia King, 1850. 

 Triiieria Bayle, 1878. 



3". Subfamily Hindellin^ Schuehert, 1894. 



CtelospiridiB aud Nncleospiridie Hall and Clarke, 1895. 



Athyridse in which the Jugum has a single i)rocess which may be sim- 

 ple, or it articulates in a ventral septal socket, and sometimes (rarely) 

 is sharply recurved terminally. Shell structure innmnctate. 



r Hindella Davidson, 1882. i Anoplotheca Sandber^^er, 1856. 



) Whitfieldella Hall and Clarke, [ Bifida Davidson, 1882. 

 ( 1893. Ccelospira Hall, 1863. 



Meristina Davidson, 1882 (not Hall, Leptocrelia Hall, 1857, 1859. 



1867). 



Nucleospira Hall, 1858. 

 Hyattella Hall and Clarke, 1893.' 



j Yitulina Hall, 1860. 

 fAnabia Clarke, 1893. 



3*'. Subfamily Athyrinje Waagen, 1883. 



Athyridic in which the single process of the jugum bifurcates 

 branches may or may not terminate between the lirst and 

 volutions of the spiralia. 



Meristina Hall, 1867. 



Athyvis Davidson, 1853 (not McCoy, 



1844). 

 Whitfieldia Davidson, 1882. 



Glassina Hall and Clarke, 1893. 



The 

 second 



Athyris McCoy, 1844. 



Spirigoia d'Orhigny, 1847. 

 Eutbyris Quenstedt, 1871. 



Actinoconchus McCoy, 1844. 

 Toryuifer Hall aud Clarke, 1895. 



Cleiothyris King, 1840 (not Phil- 

 lips, 1841). 

 Seminula McCoy, 1844. 

 Si)irigerella Waagen, 1883. 

 Anoniactinella Bittner, 1890. 

 Ponuitospirclla Bittner, 1892. 

 Amphitomella Bittner, 1890. 

 Tetractiiu'lla Bittner, 1890. 



Plii'igeia I'.ittncr, 1890. 



Pentactiuella Bittner, 1890. 



