scm.HKKT] CLASSIFICATION OF TFLOTREMATA. 127 



Subfamily Dayin^e Waageii, 18S3. 



Atrypidii' with the jii.^^iim drjiwn out i)osterioily into a simple short 

 process. Spiralia laterally directed. 



Dayia Davidson, 1882. 



la''. Subfamily Atuypin.k Waagen, 1883. 



Atrypidie with the juguni situated extremely posterior, complete in 

 younj? stai^es, but at maturity discontinuous. Spiralia dorso-medially 

 directed. 



Atrypa Balman, 1828. I (jmenewaldtia Tschernyschew, 



Cleiotliyris Phillii)s, 1841 (not King, J i oor 



1830). 

 Si>irigeriiiii d'Orbigny, 1874. 



?Karpinskya Tschernyschew, 18S5. 



2. Family SPIRIFERID^ King, 1840 (emend Davidson). 



Martinihiu' and Retirnlariina' Waagen, 1883; Spiriferinitl:i^ Davidson, 1884. 



Spiriferacea with the crura directlj'^ continuous with the bases of the 

 ])riiuary lamelhi^, which are situated between the laterally directed 

 s])iralia. Jugum simple, complete or incomplete. 



2a. Subfamily SUESSIIN^ Waagen, 188.3. 



Spiriferida' with the Jugum continuous and more or less V-shaped. 

 Shell structure punctate. 



Cyrtina Davidson, 1858. 

 Theocyrtella Bittner, 1802. 



Cyrtotbeca Bittner, 1890 (not Salter). 



Spiriferina d'Orbigny, 1847. 

 Suessia Deslongchamiis, 1854. 



Subfamily UncitinyE Waagen, 1883. 



Spiriferidie ( ?) with the jugum as in Suessiime. Just within the 

 posterior margin of the dorsal valve are pouch-like plates. Deltidial 

 l)lates united, deeply concave. Subfamily anomalous. 



Uncites Defrance, 1825. | ?Uncinella Waagen, 1883. 



2b. Subfamily Trigonotretin^ Schuchert, 1803. 



Deltliyriu;!' (partlm) Waageu, 1883. 



Spiriferida' Avith the jugum at maturity discontinuous, represented 

 by two short jugal ])rocesses, one attached to each primary latnella. 



? Cyclospira Hall and Clarke, 1803. Syringothyris Winchell, 18(53. 



Spirifer Sowerby, 1815. Spinfer Meek and Hayden, 1864. 



Choristitos Fisher de Waldbeim, 1825. Delthyris Dalmau, 1828. 



Trigonotreta Koenig, 1825; Meek and Martiuia McCoy, 1844. 



Hayden, 1864. Martiuiopsis Waagen. 1 883. 



Spiriferns Blaiuville, 1827. Tvr , ,. .^ . ,, io^i 



, , . .- r 1 r, o 1 ,oo- Ment/elia Quenstedt, 18< 1. 



Spinfera J. de C. Sowerby, 183.). ' 



Brachytbyris McCoy, 1844. Amboccelia Hall, 1860. 



Fuselia McCoy, 1844. Reticularia McCoy, 1844. 



iryateroiitluis(,)nenst.'dt, 1871. Vemouilia Hall and Clarke, 1803. 



Cyrtia Dalman, 1828. ? Metaplasia Hall and Clarke, 1803. 



