128 



SYNOPSIS OF AMERICAN FOSSIL BRACHIOPODA. 



1 HULL. 87. 



3. Family ATHYia])yE Tliillips, 1841. 



NucIeo8piri(l;e Davidson, 1882; Kouinckinidae Davidson, 1853. 



Spiriferacoa with the bases of the primary lamelhe situated between 

 the spiralia, aud sluirply recurved dorsally at their junction with tlie 

 crurn. Si)iralia more or less laterally directed. Jugum complete, 

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

 wise modified process. 



3a. Subfamily RHYNCHOSPiRiNiE Schuchert, 1894. 

 RetziiniB Waagen, 1883; Retziida' aud RhyuchospiridfB Hall aud Clarke, 1895. 



Athyrida; with the single process of the jugum commonly recurved, 

 but sometimes bifurcated. Shell structure distinctly punctate. 



Homceospira Hall and Clarke, 1893. ^ Parazyga Hall and Clarke, 1893. 



Rhynchospira Hall, 1859. 

 Ptychospira Hall and Clarke, 1893. 

 Eumetria Hall, 1864. 

 Trematospira Hall, 1857. 



Acambona White, 1862. 

 Hustedia Hall and Clarke, 1893. 

 Retzia King, 1850. 

 Trigeria Bayle, 1878. 



3*. Subfamily Hindellin^ Schuchert, 1894, 



CoelospiridiB aud Nncleospiridie Hall aud Clarke, 1895. 



Athyrid* in which the jugum has a single i^rocess which may be sim- 

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

 is sharply recurved terminally. Shell structure impunctate, 



I Anoplotheca Sandberger, 1856. 

 Bifida Davidson, 1882. 

 Ccelospira Hall, 1863. 



r Hindella Davidson, 1882. 



' Whitfleldella Hall and Clarke, 



( 1893. 



Meristina Davidsou, 1882 (not Hall 

 1867). 

 Nucleospira Hall, 1858. 

 Hyattella Hall and Clarke, 1893. 



Leptocffilia Hall, 1857, 1859. 

 Yitulina Hall, 1860. 

 lAnabia Clarke, 1893. 



3^. Subfamily Athyrin^ Waagen, 1883. 



Athyridiie in which the single ])rocess of the jugum bifurcates. The 

 branches may or may not terminate between the first and second 

 volutions of the spiralia. 



Cleiothyris King, 1840 (not Phil- 

 lips, 1841). 

 Seminula McCoy, 1844. 

 Spirigerella Waagen, 1883. 

 Anomactinella Bittner, 1800. 

 Pomatospirella Bittner, 1892. 

 Amphitomella Bittner, 1890. 

 Tetractinella Bittner, 1890. 



Plicigera Bittner, 1890. 



Pentactinella Bittner, 1890. 



Meristina Hall, 1867. 



Athyris Davidsou, 1853 (uot McCoy, 



1844). 

 Whitfieldia Davidsou, 1882. 



Glassina Hall and Clarke, 1893. 

 Athyris McCoy, 1844. 



Spirigera d'Orbiguy, 1847. 

 Eutbyris Queustedt, 1871. 



Aciinoconchus McCoy, 1844. 

 Toryuifer Hall and Clarke, 1895. 



